JPH0686304A - Color photographic film reader - Google Patents

Abstract

(57) [Abstract] [Purpose] Concerning color photographic film reading, filters with different color separation characteristics are used according to the wavelength difference of the recording of the color photographic film, and the optimum peak wavelength and band are used. It is to provide a film reading device for reading an image in a range. [Structure] Image separation is performed by a filter unit 30 set as wavelength components I, II, III, and IV, and I, II, and III filters are used for different types of films 2.
Or the combination of IV, II, and III filters is configured to perform optimum color separation. Further, the light source 10a whose emission characteristics can be changed is used to perform the same color separation. Further, the filter unit 30
And 10a light source were used in combination to perform similar color separation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color photographic film reading apparatus having continuous gradation (hereinafter referred to as a film reading apparatus), and more particularly to a negative color for color photography.
High resolution and high resolution for different types of color photographic film (hereinafter referred to as film) such as photographic film (hereinafter referred to as negative film) and positive color photographic film (hereinafter referred to as positive film) used for slide projection. The present invention relates to a film reading device suitable for inputting a gradation natural image.

[0002]

2. Description of the Related Art Conventionally, a film reading device for obtaining a color image signal from a recording medium such as a film is a device using a two-dimensional image pickup device such as a color video camera or a CCD.
A device using a one-dimensional image pickup device such as a line sensor is widely used. In these film reading devices, an image obtained from the film is read for each color component to extract a color signal. That is, three colors, R (red), G (green), and B, which are the visual characteristics of the human eye,
It is decomposed into each component of (blue).

Generally, these film readers irradiate the film with light of a specific color component and allow only the specific color component of the film to pass through, or irradiate the film with light of a wide wavelength component. A method is used in which a specific color component is extracted by a color separation filter (hereinafter referred to as a filter) after being transmitted. In any case, a specific color component, for example, a luminance component having a wavelength in the range of R (red), G (green), B (blue), etc. is extracted from the wavelengths of the visible light components, and is extracted by the imaging means. It is for inputting and producing a color image signal.

An example of such a film reading apparatus uses a large number of image pickup elements arranged in a one-dimensional manner, that is, a one-dimensional sensor, and an image and this one-dimensional sensor are used.
There is a configuration in which the positional relationship between and is moved by one column and two-dimensional images are sequentially input. The number of pixels for one dimension of the image signal can be set up to the number of image pickup elements of the one-dimensional sensor (for example, 3000), and the remaining one dimension can be set by the number of readings that are input by moving the physical position. Therefore, for example, a high-definition image signal of 3000 × 4000 pixels can be realized. Related to this is, for example, Japanese Patent Laid-Open No. 3-201785.
The technique described in the publication is known.

In this conventional technique, the type of film to be read is discriminated, and the reading can be performed for each color component in the luminance range according to the type of film. Here, comparing the color characteristics depending on the type of film, in the case of a positive film, the balance of the three color components is almost the same, whereas in the case of a negative film, the offset values of the three color components are different. That is, the three colors have different balances. The different characteristics of this negative film were corrected, the characteristics were aligned and read. Therefore, depending on the conditions, a good image signal may be obtained in some cases. However, the difference between the negative film and the positive film is not only the difference in the luminance range for each color component of the color development, but also the wavelength of each color component is different. In the past, the point that images could not be read was not fully recognized.

The conventional technique will be described in more detail with reference to FIGS. FIG. 15 is a diagram showing the spectral sensitivity characteristic of a general positive film, FIG. 16 is a diagram showing the spectral color density density characteristic of a general positive film, and FIG. 17 is
A diagram showing the spectral sensitivity characteristics of a general negative film, FIG.
8 is a diagram showing the spectral color density characteristics of a general negative film, and FIG. 19 is a general color photographic paper (hereinafter referred to as color paper).
FIG. 20 is a diagram showing the spectral sensitivity characteristics of the paper).
FIG. 4 is a diagram showing a spectral color density characteristic of a general color paper. In the spectral sensitivity characteristics of the positive film shown in FIG. 15, the vertical axis represents the specific sensitivity (logarithm), and the horizontal axis represents the wavelength (nm).
Is taken.

The range of wavelengths recognizable by the human eye, that is, visible light is generally said to be around 400 nm to 700 nm. In this visible light range, the B (blue) component is around 400 to 500 nm, and the G (green) is around 500 to 600 nm.
It is generally well known that the R component is the R (red) component around 600 to 700 nm, and the spectral sensitivity characteristic curves 301, 30
2, 303 shows that. The positive film has a light-sensitive area corresponding to each color component,
These light-sensitive areas are recorded as an image in response to light. In general, the display of the spectral sensitivity characteristic having a complicated shape is often represented by the peak wavelength and the band. For example, as for the spectral sensitivity characteristic of the general positive film shown in FIG. 15, the peak wavelength of the spectral sensitivity characteristic curve 303 of the R (red) component is around 640 nm, and the band is half the peak. The range, or so-called full width at half maximum, is about 80 nm.

The spectral color density characteristics of a general positive film shown in FIG. 16 are obtained by plotting the spectral reflection density (D) on the vertical axis and the wavelength (nm) on the horizontal axis. The coloring material for developing the color of the positive film is a component having a complementary color relationship with a sensitive color component, Y (yellow, yellow), M (magenta, magenta), C
The components (cyan and light blue) are configured to develop colors. That is, B (blue) spectral sensitivity characteristic curve 3
01 (Yellow-yellow) spectral color density characteristic curve 304, G (green) spectral sensitivity characteristic curve 302 M (magenta, magenta) spectral color density characteristic curve 30
5, C corresponding to the spectral sensitivity characteristic curve 303 of R (red)
The (cyan and light blue) spectral color density characteristic curves 306 correspond to each other.

The spectral color density has an inverse logarithmic relationship with the luminance of its component wavelength. That is, the color development is to reduce a specific color component from the color components of the light source, and to reproduce the original color component visually. Figure 15,
As shown in FIG. 16, the spectral sensitivity characteristic and the spectral color density characteristic of the positive film have almost the same peak wavelength,
Only the band ranges are slightly different, and the respective spectral components correspond to each other, which almost coincides with the human visual characteristics.

The spectral sensitivity characteristic of a general negative film shown in FIG. 17 is obtained by taking the specific sensitivity (logarithm) on the vertical axis and the wavelength (nm) on the horizontal axis. It is set to a characteristic that almost matches the sensitivity characteristic of the eye. The spectral color density characteristic of the negative film is greatly different from the spectral sensitivity characteristic of the negative film. The spectral color density characteristic of a general negative film shown in FIG. 18 is obtained by plotting the spectral diffusion density characteristic (D) on the vertical axis and the wavelength (nm) on the horizontal axis. The ingredients are different.

In particular, the spectral sensitivity characteristic curve 3 of the R (red) component
No. 09 has a peak wavelength of about 640 nm, whereas C (cyan, light blue) coloring density characteristic curve 31
The peak wavelength of No. 2 is around 700 nm, which is greatly deviated. As described above, the range of color development of the R (red) component of this negative film is significantly different from the range of color development of the positive film. The negative film has a structure in which a color of a component different from the incident light is developed. Further, the color development characteristics of the negative film are characterized in that, as shown by the minimum density curve 313, the minimum densities of the recordings of the three colors are different, and the characteristics are offset.

Next, the spectral sensitivity characteristics and spectral color density characteristics of a general color paper corresponding to a negative film will be described. In the spectral sensitivity characteristic of a general color paper shown in FIG. 19, the vertical axis represents the specific sensitivity (logarithm) and the horizontal axis represents the wavelength (n
m), the general color shown in FIG.
The spectral color density characteristics of the paper are obtained by plotting the spectral diffusion density (D) on the vertical axis and the wavelength (nm) on the horizontal axis. In both of these figures, the spectral sensitivity characteristic and the spectral color density characteristic correspond to each other. That is, R (red)
The spectral sensitivity characteristic curve 316 is set to have a peak wavelength near 700 nm, which is different from the spectral sensitivity characteristic of the human eye and is matched with the color developing characteristic of the negative film.

The sensitivity of the color paper is set to 3
The color components are set to have different sensitivities, and are set to the inverse characteristics of the spectral color density characteristics of the negative film described in FIG. 18, so that when used in combination with the negative film, each color can be balanced. It is set. The spectral color density characteristic of the general color paper shown in FIG. 20, for example, the spectral sensitivity characteristic curve 31 of R (red)
The C (cyan, light blue) coloring / coloring density characteristic curve 319 for 6 has a peak wavelength near 640 nm. The color development characteristics of C (cyan, light blue) substantially match the sensitivity characteristics of the human eye, and the color development characteristics of the image obtained as a whole substantially match the spectral sensitivity characteristics at the time of shooting a negative film. It will be.

As described above, the negative film color image system reproduces a color image by integrating the characteristics of the two image media of the negative film and the color paper. Therefore, if an image is to be input to the negative film that is a part of the system according to the spectral sensitivity characteristics of the human eye, images in different bands will be input. When a specific wavelength component is extracted using a filter having a spectral characteristic with a narrow bandwidth, an image can be captured efficiently when the extracted wavelength component matches the wavelength of the recorded color material. .

However, in the case of an image recorded with a wavelength component different from the spectral characteristic of the filter, the amount of light is insufficient and the S / N ratio deteriorates. To compensate for this, it is necessary to increase the accumulation time of capture. It is not preferable that the uptake time becomes long. Here, it is conceivable to make the spectral characteristic of the filter wider than the wavelength range of the transmitted light. For example, from 600nm to 750n
A filter having a spectral characteristic with a wide bandwidth up to around m is used. By doing so, it is possible to deal with different types of films. However, when the bandwidth of the spectral characteristic of the filter is widened, there is a problem in that the separation from the adjacent band becomes poor, which is not preferable.

[0016]

In the above-mentioned conventional film reading apparatus, when the image recorded on the negative film is color-separated and read, the color separation means of the positive film,
For example, it is necessary to match the spectral sensitivity characteristic of the color material recorded on the film by using a filter having a spectral characteristic different from that of the positive film filter. That is, depending on the type of film to be read, the peak wavelength and the band range are different for each color component of the recorded image, and if the color components having the same characteristics are extracted, the color separation in the required band cannot be performed. There is a problem that it is necessary to change the peak wavelength and band range of the color components to be separated depending on the type of film to be read. The present invention was made in order to solve the above-mentioned problems of the prior art, and corresponds to the type of film to be read,
An object of the present invention is to provide a film reading device capable of changing the peak wavelength and band range of the spectral characteristic of the color separation means.

[0017]

In order to achieve the above object, the structure of the first invention relating to the film reading apparatus of the present invention is a holding means for holding the film, and a color image of the film is formed. Image forming means, decomposing means for decomposing the color image by the image forming means into a plurality of wavelength components I, II, III, IV, and imaging means for inputting and reading the image components after the decomposition, and these. In the film reading apparatus provided with a control device for controlling, the separating means uses an optical filter, and sets the wavelength component range I, II, III, IV of the color to be decomposed to the type of film to be decomposed. It can be changed to any one of I, II, III or IV, II, III depending on the situation. That is, the number of filters corresponding to the number of separated colors is used, and means for changing the peak wavelength and band range of the spectral characteristic of the filter to different types of groups is provided according to the type of film. Is.

In order to achieve the above object, the structure of the second invention relating to the film reading apparatus of the present invention comprises a holding means for holding the film, and an image forming means for forming a color image of the film. Decomposing means for decomposing the color image by the image forming means into a plurality of wavelength components I, II, III and IV, an image pickup means for inputting and reading the image components after the decomposition, and a control device for controlling these. In the film reading apparatus including the above, the disassembling means uses a light source capable of changing the light emission characteristics of the light source, and sets the wavelength component range I, II, III, IV of the color to be resolved to the type of film to be resolved. It can be changed to any one of I, II, III or IV, II, III depending on the situation. That is, a light source having a plurality of light emission characteristics corresponding to the number of separated colors is used, and a means for changing the peak wavelength and the band range of the light emission characteristics of the light source to a different type of group is provided according to the type of film. It is a thing.

In order to achieve the above object, the third invention of the film reading apparatus according to the present invention has a holding means for holding the film and an image forming means for forming a color image of the film. Decomposing means for decomposing the color image by the image forming means into a plurality of wavelength components I, II, III and IV, an image pickup means for inputting and reading the image components after the decomposition, and a control device for controlling these. In the film reading apparatus including the above, the decomposing means uses a combination of an optical filter and a light source whose emission characteristics can be changed, and the range of wavelength components of colors to be decomposed, I, II, III, IV
Corresponding to the type of film to disassemble the setting of, I, II, I
It can be changed to II or IV, II, or III. That is, a combination of a filter corresponding to the number of separated colors and a light source whose emission characteristics can be changed is provided, and means for changing the peak wavelength and band range of the spectral characteristics obtained by these combinations to different types of groups is provided. Is.

[0020]

The function of each of the above technical means is as follows.
According to the structure of the first invention, the decomposing means for decomposing the color image into the plurality of wavelength components I, II, III, IV is an optical filter.
And the range I, I of the wavelength components of the color to be resolved
Depending on the type of film that decomposes the setting of I, III, IV,
I, II, III or IV, II, III can be changed. By changing the peak wavelength and band range of the spectral characteristics, the color components of the image recorded on the film to be read can be changed. It is possible to extract the components of the image according to the peak wavelength and the band range. Further, when the output of the above-mentioned separation means is input to the image pickup means and used in combination, an image signal which is color-separated with a characteristic that matches the spectral sensitivity characteristic of the color material recorded on the film is read, so An image can be read with a wide dynamic range and less interference with color components in adjacent wavelength ranges.

According to the second aspect of the invention, a light source capable of changing the light emission characteristics of the light source is used, and the setting of the wavelength component range I, II, III, IV of the color to be resolved is set to the type of film to be resolved. According to the present invention, any one of I, II, III or IV, II, III can be changed, so that the same effect as the first invention can be obtained. According to the structure of the third invention, an optical filter and a light source whose emission characteristics can be changed are used in combination, and the range I, II, II of the wavelength components of the color to be decomposed
Corresponding to the type of film that decomposes the setting of I, IV, I,
Since it can be changed to either II, III or IV, II, III, the same action as the first and second inventions is produced.

[0022]

Embodiments of the present invention will be described below with reference to FIGS.
Will be described with reference to. [Embodiment 1] An embodiment of the first invention will be described. Figure 1
1 is a perspective view showing an appearance of a film reading device according to an embodiment of the present invention, FIG. 2 is a perspective view showing an internal mechanism of the film reading device shown in FIG. 1, and FIG. 3 is a film reading device shown in FIG. FIG. 4 is a flow chart showing the operation of the film reading device shown in FIG. 1, and FIG. 5 is a spectral sensitivity characteristic of a filter used in the film reading device shown in FIG. It is a diagram.

1, 2, 3 and 4, 1 is a film reading device, n is a notch, 2 is a film, 10 is a light source, 11 is a light source lamp, 12 is an infrared cut filter, and 13 is a light source 10. Drive circuit, 20 is an imaging lens, 2
Reference numeral 1 is AF driving means for the imaging lens 20, 30 is a filter section, 31 is a filter-moving means, 32 is a drive motor for the filter-moving means 31, 33-I is an R (red) filter, 34 -II is G (green) filter-, 35-III is B
(Blue) filter, 36-IV is R '(different red) filter, 50 is CCD one-dimensional sensor (hereinafter referred to as one-dimensional sensor), 51 is one-dimensional sensor-50 reading means, and 52 is one. Dimensional sensor-50 translation means, 53
Is a reading condition setting circuit of the reading means 51, 54
Is a motor for driving the parallel moving means 52, and 70 is an A / D
A conversion circuit, 90 is a system controller for controlling the film reading apparatus 1, 100 is an image memory, 110 is an I / F circuit, 130 is a film holding unit, 141 is a film type setting switch (hereinafter referred to as a type setting switch). , 142 to 145 are film reading condition setting switches (hereinafter, referred to as condition setting switches).

The structure of the film reading apparatus 1 will be described with reference to FIGS. 1 and 2. In FIG. 1, the film reading apparatus 1 has a rectangular casing, and a type setting switch 141 and condition setting switches 142 to 145 are arranged on the front surface in the longitudinal direction of the casing. A notch n is provided at a slightly front portion in the center in the longitudinal direction. A film 2 is set in the cut portion n so as to face the imaging lens 20, and the film 2 can be set to a reading position by manually reading a required frame from outside the apparatus. The type setting switch 141 can be used to set the type of film to be read such as negative film and positive film, and if necessary, various other condition settings (for example, selection of color / monochrome,
It is possible to set the selection of the content of the capture processing, the number of pixels of the captured image, etc. by the condition setting switches 142 to 145.

In FIG. 2, the light emitted from the lamp 11 constituting the light source 10 is transmitted to the film 2 through the infrared cut filter-12. Here, since the one-dimensional sensor-50 has a spectral characteristic at wavelengths other than visible light, the infrared cut filter-12 is used to prevent its exposure. The film 2 is sandwiched between the film holders 131 and held by the holding means 130.
As a result, the position of the film 2 is fixed during the image reading operation.

The filter section 30 is composed of filters of types I to IV for extracting color components of color. These filters are I-type color filters-for example, R (red) filters-33 and II-type filters-
For example, it comprises a G (green) filter-34, a III type filter-for example, a B (blue) filter-35, and an IV type filter-for example, an R '(different red) filter-36. Each of these filters-33, 34, 35, 36
Are moved by the filter-moving means 31 driven by the motor 32, and are respectively placed in the optical path from the light source 10 to the one-dimensional sensor 50.

The one-dimensional sensor 50 is attached to the parallel moving means 52 so that it can be moved by the driving motor 54. During the image capturing operation, the driving motor 54 is operated in accordance with the capturing speed so that the parallel moving means 52 is sequentially moved at intervals corresponding to the arrangement of the elements of the one-dimensional sensor 50 corresponding to the reading operation. It has become.

The light that has passed through the infrared cut filter 12 passes through the film 2 on which an image is recorded, passes through the imaging lens 20, and is sent to the filter section 30. An image of a color component is selected by this filter-30. The image of the selected color component is sent to the one-dimensional sensor 50. Then, the imaging lens 20 forms an image on the moving imaging surface of the one-dimensional sensor 50.

When the film reading device 1 reads the film 2, the filter is moved in accordance with the color component to be read, for example, the R (red) filter 33 for the red component and the G for the green component. The (green) filter-34 and the like can be sequentially used. In FIG. 2, an image obtained from the film 2 is transmitted through the II type G (green) filter-34 in the filter unit 30. Then, the configuration is shown in which an image is formed on the image pickup surface of the one-dimensional sensor 50.

Next, the function of this embodiment will be described with reference to FIGS. In FIG. 3, the same reference numerals in FIG. 3 are equivalent to those in FIGS. 1 and 2, and therefore description thereof will be omitted, and only those portions not described in FIGS. 1 and 2 will be described. Reference numeral 13 is a light source drive circuit of the light source 10, 21 is an AF driving means for the imaging lens, 51 is a reading means of the one-dimensional sensor-50, 53 is a reading condition setting circuit, 70 is an A / D conversion circuit, and 90 is a film reading device. System controller for controlling 1
Reference numeral 100 is an image memory, and 110 is an I / F circuit.

First, the light source 10 is controlled by the system controller 90 via the light source drive circuit 13. The light emitted from the light source 10 passes through the infrared cut filter 12, passes through the film 2, and is sent to the imaging lens 20. The spectral transmission characteristics of the infrared cut filter at this time are as follows: filters 33, 34, 3 used in subsequent stages.
It is sufficiently wider than the wavelength band of 5,36, for example, 370n
It transmits light in the vicinity of m to 750 nm.

Focusing of the imaging lens 20 is performed by the system controller 90 via the AF driving means 21. As a result, the focus of the imaging lens 20 is adjusted to the moving image pickup surface of the one-dimensional sensor 50. Filter unit 30
Are arranged between the imaging lens 20 and the one-dimensional sensor 50. Then, in each of the filters 33, 34, 35, 36 in the filter unit 30, the system controller 90 controls the filter moving means 31, and the filters are moved and replaced.

The image forming lens 20 forms an image of a monochromatic component among the images recorded on the film 2 on the image pickup surface of the one-dimensional sensor 50. Next, the one-dimensional sensor moving means 52
The sensor reading circuit 51 and the sensor reading circuit 51 operate under the control of the system controller 90 to read an image for each line. First, the system controller 90 issues a reading command to the reading condition setting circuit 53, operates the reading circuit 51, and reads the first one-line image.
The read image data is sent to the A / D conversion circuit 70.

Next, the one-dimensional sensor moving means 52 is operated to move the one-dimensional sensor 50 to the reading position of the next one line. After the movement, the sensor reading circuit 51 is operated again to read the image data of the next one line. By repeating these series of operations, a two-dimensional image can be read. The read image data is A /
The D conversion circuit 70 converts the signal into a digital signal, which is sent to the image memory 100 and temporarily stored therein. Then, the film reading device 1 takes in the image recorded on the film 2 that has been taken as an electric signal, and outputs the electric signal from an external interface to an external device (for example, a computer).

In this way, first, the reading of one screen of the first one-color component is completed, and the reading of one screen of the color component to be performed next is carried out. That is, the filters 33, 34, 35, 36 in the filter unit 30 are
The filter-moving means 31 is operated, and the required filter is replaced. Then, similarly to the first reading of one color component, the image signal is read line by line. This reading operation for each color component is performed for a plurality of colors (three color components in this embodiment), and the reading of the color image of one screen is completed.

In the present embodiment, the filters set in the filter unit 30 are four types having the spectral characteristics from I to IV. Of these four types, the filter to be used is, for example,
A combination of I, II and III and a combination of IV, II and III are selected and used. This selection method will be described with reference to the flowchart shown in FIG. 4 which shows the operation of the film reading apparatus shown in FIG. System controller 9
0 detects the setting contents of the type setting switch 141 in step 401, determines whether the film type is negative or positive in step 402, and shifts to the respective reading routines. In the case of a positive film, the filters of types I, II, and III are used to perform steps 403 and 40.
4, the color components are separated in the order of step 405. Further, in the case of a negative film, step 406, step 407, using the filters of types IV, II, III,
The color components are separated according to the order of step 408.

FIG. 5 is a setting example of the spectral characteristics of the filter in this embodiment, in which the vertical axis represents the spectral transmittance (%) and the horizontal axis represents the wavelength (nm). Spectral characteristic curve 34
0,341, the type I filter is R
It has the characteristics of (red), and the peak value of the characteristics is about 6
The filter of IV type is set to around 40 nm.
It has the characteristic of R '(different red), and the characteristic peak
Value is set to about 700 nm.
Table 1 shows an example of combinations of the types of filters used for disassembling the positive film and the negative film among the filters having the characteristics shown in FIG.

[Table 1] In the case of a positive film, I-type filter-R (red) is used for color separation of R (red). In the case of a negative film, for the color separation of R (red), IV type filter-R '
(Different red) is used. For color separation of B (blue) and G (green), the same type II filter and type III filter are used for a positive film and a negative film, respectively.

When used as in this combination example, in the case of a positive film, C, which is the complementary color of the recorded red, is used.
(Cyan, light blue) dye can be decomposed in conformity with the characteristic around the peak value of about 640 nm which is the peak value of the spectral characteristic. Further, in the case of a negative film, the C (cyan, light blue) dye, which is a complementary color of the recorded red, is decomposed in conformity with the characteristic around the peak value of about 700 nm which is the peak value of the spectral characteristic. be able to.

In the case of a negative film, in addition to the above recording wavelength, it is necessary to correct the offset of the brightness which is different for each color component. With respect to this point, it is possible to balance the three color components by means of a conventional technique, such as means for changing the storage time of the sensor during reading. In this way, according to the present embodiment, the color components are separated by using the filters that match different spectral characteristics of the recorded image depending on the type of film. As a result, it is possible to prevent the mixing of other color components, and since it is possible to read efficiently with a wide luminance range, it is possible to shorten the reading time.

[Embodiment 2] Another embodiment of the first invention will be described. FIG. 6 is a perspective view showing an internal mechanism of a film reading device 1 according to another embodiment of the present invention, and FIG.
8 is a block diagram showing the function of the film reading apparatus 1 shown in FIG. 8, FIG. 8 is a diagram showing the spectral characteristics of an infrared cut filter and a filter used in the film reading apparatus 1 shown in FIG. 6, and FIG. FIG. 9 is a diagram showing a combined spectral characteristic of the infrared cut filter and the filter shown in FIG. 8. In FIGS. 6 and 7, the same reference numerals as those in FIGS. 1 to 3 represent the same parts, and thus the description thereof will be omitted. 12a is an infrared cut filter group, 121 is a type V infrared cut filter, 122 is a type VI infrared cut filter,
Reference numeral 123 is an infrared cut filter-replacement means, and 124 is the same drive motor.

The structure of this embodiment is almost the same as that of [Embodiment 1]. In [Example 1], the infrared cut filter 12 simply cuts light of wavelengths other than visible light. In this embodiment, the infrared cut filter-group 12 is used.
Reference symbol a is composed of a type V infrared cut filter and a type VI infrared cut filter having different spectral characteristics. These infrared cut filters V, VI and filters I, II, III, IV work in combination. 6,
7, the light emitted from the lamp 11 that constitutes the light source 10 passes through the infrared cut filter group 12a and the film 2
To form an optical path between the lamp 11 and the film 2. The infrared cut filter group 12a includes a type V filter 121 and a type VI filter 122 having different spectral characteristics, and is driven by a drive motor 124. Moved by. Then, it is arranged in the optical path between the lamp 11 and the film 2. In this way, the infrared cut filter-group 12
The type of a can be changed.

The film 2 is sandwiched between film holders 131 and held by the holding means 130. As a result, the position of the film 2 is fixed during the image capturing operation. The light transmitted through the film 2 proceeds to the filter unit 30 via the imaging lens 20. The filter unit 30 is provided with filters of types I to IV for extracting color components of color. For example, the type I filters are R (red) filters 33 and II types. The filter is a G (green) filter-34, the type III filter is a B (blue) filter 35, and the type IV filter is an R '(different red) filter-36. The filter unit 30 is moved by the filter moving unit 30 driven by the motor 31.
It is possible to select different types of filters from the above filters.

An image of a color component is extracted by this selected filter. The image light of the extracted color components is sent to the one-dimensional sensor 50, and is imaged by the imaging lens 20 on the moving imaging surface of the one-dimensional sensor 50. The color components of the image formed on the imaging surface are filtered by
A component having a combined spectral characteristic of the unit 30 and the infrared cut filter-set 12a is extracted.

The above function will be described in detail with reference to specific numerical examples. In the diagram of the spectral characteristics of the infrared cut filter and the filter shown in FIG. 8, the vertical axis represents the spectral transmittance (%) and the horizontal axis represents the wavelength (nm). The type V infrared cut filter-121 has a spectral characteristic of transmitting light from approximately 400 nm to approximately 650 nm, and the type VI infrared cut filter-122 has approximately 750 n from approximately 400 nm.
It has a spectral characteristic of transmitting light up to around m. Spectral characteristic curves 324 and 325 respectively show this. Further, the filter has spectral characteristics that allow the R (red) type I filter to transmit a wavelength of approximately 600 nm or more, and the R '(different red) type IV filter to transmit a wavelength of approximately 650 nm or more. Have. Spectral characteristic curve 326,
327 shows this, respectively. When these infrared cut absorption filters and filters are combined, the respective characteristics have combined spectral characteristics.

In the diagram of the combined spectral characteristics of the infrared cut filter and the filter shown in FIG. 9, the vertical axis represents the spectral transmittance (%) and the horizontal axis represents the wavelength (nm). The type VII type filter--the characteristic is obtained as a combined characteristic of the type V infrared cut filter and the type I R (red) filter in FIG. That is, the spectral characteristic curve 328
Is obtained as a combination of the spectral characteristic curve 324 and the spectral characteristic curve 326. The type VIII type filter-characteristics are obtained as a combined characteristic of the type VI infrared cut filter and the type IV type R '(different red) filter shown in FIG. That is, the spectral characteristic curve 329 is obtained as a combination of the spectral characteristic curve 325 and the spectral characteristic curve 327. In this way, a plurality of types of filters can be appropriately combined and used as a filter having a required spectral characteristic.

The type VII type filter characteristic shown in FIG. 9 extracts red light from around 600 nm to around 650 nm. This characteristic is almost the same as the light emitting characteristic of the positive film. The spectral characteristic curve 328 shows this. The characteristic of the type VIII type filter operates as a red color extraction filter in a band from about 650 nm to about 750 nm. This characteristic almost coincides with the light emitting characteristic of the negative film. A spectral characteristic curve 329 shows this. In this way, by changing the combination of the filters to be used in a predetermined manner, [Example
Similarly to the above [1], it is possible to perform color separation of a required band characteristic.

Subsequent fetching operations for one screen of one color component and reading operation of the entire color image of each color component are the same as those in [Embodiment 1], and the description thereof will be omitted. In this way, a specific color component in the image recorded on the film 2, that is, an infrared cut filter
The image of the color component having the combined spectral characteristic of 12 and the filter 30 is sent to the image pickup means.

[Embodiment 3] Still another embodiment of the first invention will be described. FIG. 10 is a block diagram showing the function of the film reading device 1 according to still another embodiment of the present invention, and FIG. 11 shows the spectral characteristics of the surface interference type mirror used in the film reading device 1 shown in FIG. It is a diagram showing. In FIGS. 10 and 11, the same reference numerals as those in FIGS. 1 to 3 represent the same parts, and thus the description thereof will be omitted. 501,
Reference numerals 502 and 503 are surface interference mirrors, 504 is a two-dimensional sensor-1, 505 is a two-dimensional sensor-2, 506 is a two-dimensional sensor-3, 507 is a two-dimensional sensor-4, 520, 52.
Reference numeral 1 is a changeover switch. This example is based on [Example
In principle, the configuration is the same as that of 1), but instead of the filter, mirrors 501, 502, 503 are used, and two-dimensional sensors-1, 2, 3, 4 and their changeover switches are used accordingly. 520 and 521 are arranged.

In FIG. 10, the light from the light source 10 passes through the infrared cut filter-12 and passes through the film 2 to obtain an image. This image is formed by the imaging lens 20 between the imaging lens 20 and the A / D conversion circuit 70 which is an image pickup device.
It is incident on 503. Further, the incident light travels and four types of two-dimensional sensors-1 (504), 2 (505), 3 (50
6) and 4 (507). The surface interference type mirrors 501, 502, 503 are so-called dichroic mirrors (hereinafter referred to as mirrors).

The mirrors 501, 502, 503 reflect light having a certain wavelength or less and transmit other light. That is, the mirror 501 transmits, for example, light having a wavelength of about 500 nm or more and reflects light of less than that.
The mirror 502 transmits light having a wavelength of 600 nm or more and reflects light having a wavelength of less than 600 nm. Mira-503 is 650
Light having a wavelength of about nm or more is transmitted and light having a wavelength of less than that is reflected. In this way, the boundary wavelengths of reflection and transmission of each mirror are set, and the wavelengths are sequentially extracted in the order of shorter wavelengths, and a specific wavelength range in the image is extracted.

Four types of two-dimensional sensors-1 (504), 2 are provided on the image planes of the reflected and transmitted wavelength components of the mirror.
(505), 3 (506) and 4 (507) are arranged respectively. A two-dimensional sensor-1 (504) is provided for the B (blue) component light around 400 to 500 nm obtained from the reflected light of the Mira-501, and similarly,
Approximately 500 to 600n obtained from the reflected light of Mira-502
A two-dimensional sensor for G (green) component light near m
2 (505), about 5 obtained from the reflected light of Mira-503
For the R (red) component light around 00 to 650 nm,
The two-dimensional sensor-4 (507) is provided for the light of R '(different red) component of about 650 nm or more obtained from the transmitted light of the two-dimensional sensor-3 (506) and the mirror-503, respectively. ing.

The image signals read out from the respective sensors pass through the changeover switches 520 and 521 and are A / D.
It is sent to the conversion circuit 70 and processed as a digital signal. Here, the outputs of the two-dimensional sensor-3 (506) and the two-dimensional sensor-4 (507) are selected by the switch 520. This switch 520 is used by the system controller 9
It is controlled by 0, and it is possible to select which output is input to the A / D conversion circuit 70 according to the type of film to be read.

Further, the switch 521 receives three signals of the outputs of the two-dimensional sensor-1 (504) and the two-dimensional sensor-2 (505) and the output selected by the switch 520. Which of the above is selected is controlled by the system controller 90. That is, the switch 521 can electrically select which color component is input. Each sensor is a two-dimensional sensor and can scan without mechanical movement. For example, a two-dimensional image signal such as 500 × 500 pixels can be read.

In the spectroscopic characteristic diagram of the mirror shown in FIG. 11, the vertical axis represents the spectral transmittance (%) and the horizontal axis represents the wavelength (nm). The characteristic of R (red) which is the type I of this color component and the characteristic of R '(different red) which is the type IV are different in peak wavelength, and are respectively the recording wavelength of the positive film and the recording wavelength of the negative film. Is almost matched with. Spectral characteristic curve 33
4, 337 respectively show this. Depending on the type of film to be read, by properly using these type I R (red) or type IV R '(different red) filter characteristics, the image signal of the optimum wavelength for the type of film can be read. You can

[Embodiment 4] Still another embodiment of the first invention will be described. FIG. 12 is a plan view of a one-dimensional sensor in a film reading device according to another embodiment of the present invention. In FIG. 12, 50 is a one-dimensional sensor, and 54, 55, 56 and 57 are one-dimensional sensor elements to which filters are attached. The one-dimensional sensor 50 is a one-dimensional sensor element 54, 55, 5 to which a filter is attached.
6 and 57 are provided in parallel at four equal intervals. Each one-dimensional sensor is provided with a plurality of, for example, 4000 photosensitive elements. The one-dimensional sensor element 54 is attached with a filter R (red), and the one-dimensional sensor element 55 is attached.
Is a filter-R '(different red), a one-dimensional sensor element 56 is a filter-G (green), a one-dimensional sensor element 57.
Has a filter-B (blue) attached thereto.

As a characteristic of the filter attached to each one-dimensional sensor element, for example, a filter having the same characteristic as the characteristic example of the filter shown in FIG. 4 of [Example 1] is used. That is, the one-dimensional sensor-element 54 is shown in FIG.
Characteristic I, the one-dimensional sensor element 55 is the characteristic IV in FIG. 4, and the one-dimensional sensor element 56 is the characteristic in FIG.
II, the one-dimensional sensor element 57 has the characteristic III in FIG. When reading image data, the one-dimensional sensor elements arranged in parallel at regular intervals can read images that are displaced by regular intervals. For example, each one-dimensional sensor-element 54, 5
When the intervals of 5, 56, 57 are spaced by 5 lines, the one-dimensional sensor element 54 reads the first line,
One-dimensional sensor-Element 55 is the sixth line, one-dimensional sensor-
The element 56 can read the 11th line, respectively.

At this time, depending on the type of film to be read, for example, in the case of a positive film, a one-dimensional sensor-
Three one-dimensional sensor elements, that is, the element 54, the one-dimensional sensor element 56, and the one-dimensional sensor element 57, are selected and used. In the case of a negative film, the one-dimensional sensor-element 55
And one-dimensional sensor element 56 and one-dimensional sensor element 57 are selected and used. These selections are performed by electrically (not shown in FIG. 12) switching the filter to be used, and performing color separation via a filter having a peak wavelength and a band component which differs depending on the type of film to be read. It can be performed. In this embodiment, a one-dimensional sensor element having a plurality of filters provided in the same sensor is used. However, similarly, a plurality of filters are provided by a two-dimensional sensor and a filter is provided. The same effect can be obtained even if the read pixels are appropriately switched and used.

[Embodiment 5] An embodiment of the second invention will be described. FIG. 13 is a block diagram showing functions of a film reading device according to still another embodiment of the present invention, and FIG.
It is a diagram which shows the spectrum of the light source in the film reader which concerns on the other Example of this invention. 13,
14, in FIG. 14, the same reference numerals as those in FIGS. 1 to 3 represent the same parts, and the description thereof will be omitted. 10a is a wavelength component,
Light source consisting of I, II, III, IV lamps, 14 is I
Type of lamp, R (red), 15 is type II of lamp,
G (green), 16 is a type III lamp, B (blue), 17
Is a lamp of type IV, R '(different red).

Each of the lamps 14, 15, 16, 17 provided in the light source 10a and having different color components of coloring is selected by the light source drive circuit 13 controlled by the system controller 90, and different wavelength components of desired types are selected. Is capable of emitting light. This embodiment has almost the same configuration as that of [Embodiment 1], but instead of a plurality of filters, a light source 1 including lamps of a plurality of color components.
The difference is that 0a is used. In FIG. 13, the image obtained from the film 2 is formed on the moving surface of the one-dimensional sensor-50. Further, during the capturing operation, a lamp to be turned on is selected according to the captured color component, and the R (red) lamp 14 for the red component and the G (green) lamp 15 for the green component.
Etc. are sequentially used to extract only a specific color component. The one-dimensional sensor 50 is attached to a moving mechanism 52, and can be moved by a motor 54 that moves the moving mechanism 52. After that, as in [Example 1], it is possible to capture a color image.

FIG. 14 is a diagram showing the spectrum of the light source 10a in this embodiment. The light source 10a is an LED
It can be realized as a light source of a monochromatic component by using a (light emitting diode) or a fluorescent tube using a monochromatic fluorescent paint. In FIG. 14, the characteristics of the I type lamp and the R (red) lamp 14 are shown in the diagram 332, and the characteristics of the IV type lamp and the R ′ (different red) lamp 17 are shown in the diagram 333. Both are red light sources having different wavelength components.
By selecting these plural light sources, it is possible to select and extract a necessary wavelength band, for example, an image of a component of 600 to 650 nm or an image of a component of 650 to 750 nm.

[Embodiment 6] As described above,
1] to [Example 4] described specific embodiments of the first invention, and [Example 5] described specific embodiments of the second invention, these [Example 1] to [Example 1] If the optical filter according to the fourth embodiment and the light source according to the fifth embodiment are combined together, the third embodiment of the invention will be described.

The present invention is not limited to this. In this embodiment, two types of negative film and positive film have been described, but other types of photographic film such as infrared color film and black and white are used. It goes without saying that the same effect can be obtained when using different types of films such as negative films and black-and-white positive films. In the description of the present embodiment, an example of a film having three types of color forming components has been described, but the same effect can be obtained even if a film having two types, four types or more of color forming components is used.

The color components to be read are not one by one,
For example, two or more types of color components such as R (red), G (green), and B (blue) are collected, and, for example, R (red) and G (green) are added to obtain Y (yellow-yellow) filter characteristics. The same effect can be obtained even when reading with "." Further, even when a single color component is extracted by the arithmetic processing of the read signal, the same effect can be obtained with respect to the band characteristic of the filter that spans a plurality of types of color components. Further, as the sensor which is the image pickup means, the example in which the one-dimensional sensor and the two-dimensional sensor are used has been described in each of the above-mentioned embodiments, but other reading methods, for example, a photoelectric tube is used to mechanically two-dimensionally measure. The same effect can be obtained in a reading device such as a so-called "drum scanner" that moves the reading point of the.

[0066]

As described above in detail, according to the present invention, there is provided a film reading device capable of changing the peak wavelength and the band range of the spectral characteristic of the color separation means according to the type of the film to be read. can do. That is, since the means for changing the peak wavelength and the band range of the spectral characteristics of the color separation means to be used to a different type of set depending on the type of film to be read, the color of the image recorded on the symmetrical film is provided. The image of the range component is extracted and read according to the peak wavelength and band range of the component, the wide dynamic range of the image is maintained, and the image is read with little interference with the color components of the adjacent wavelength range. Thus, it is possible to provide a film reading apparatus capable of inputting image data having an excellent color balance in a short time.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a film reading device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an internal mechanism of the film reading device shown in FIG.

FIG. 3 is a block diagram showing functions of the film reading apparatus shown in FIG.

FIG. 4 is a flowchart showing the operation of the film reading apparatus shown in FIG.

5 is a diagram showing a spectral sensitivity characteristic of a filter used in the film reading apparatus shown in FIG.

FIG. 6 is a perspective view showing an internal mechanism of a film reading device 1 according to another embodiment of the present invention.

7 is a block diagram showing functions of the film reading device 1 shown in FIG.

8 is a diagram showing spectral characteristics of an infrared cut filter and a filter used in the film reading apparatus 1 shown in FIG.

FIG. 9 is an infrared cut filter and a filter shown in FIG.
It is a diagram which shows the synthetic | combination spectral characteristic with.

FIG. 10 is a block diagram showing functions of the film reading device 1 according to still another embodiment of the present invention.

11 is a diagram showing the spectral characteristics of a surface interference mirror used in the film reading apparatus 1 shown in FIG.

FIG. 12 is a plan view of a one-dimensional sensor in a film reading apparatus according to another embodiment of the present invention.

FIG. 13 is a block diagram showing functions of a film reading device according to still another embodiment of the present invention.

14 is a diagram showing a spectrum of a light source in the film reading apparatus shown in FIG.

FIG. 15 is a diagram showing a spectral sensitivity characteristic of a general positive film.

FIG. 16 is a diagram showing spectral color density characteristics of a general positive film.

FIG. 17 is a diagram showing a spectral sensitivity characteristic of a general negative film.

FIG. 18 is a diagram showing spectral color density characteristics of a general negative film.

FIG. 19 is a diagram showing a spectral sensitivity characteristic of a general color paper.

FIG. 20 is a diagram showing a spectral color density characteristic of a general color paper.

[Explanation of symbols]

1 film reading device n notch 2 film 10, 10a light source 11 light source lamp 12, 12a infrared cut filter-13 light source drive circuit 14 I type lamp, R (red) 15 II type lamp, G (green) ) 16 III type lamp, B (blue) 17 IV type lamp, R '(different red) 20 Imaging lens 21 AF driving means of imaging lens 20 30 Filter-section 31 Filter-moving means 32 Filter- Driving motor for moving means 33-IR filter-34-II G filter-35-III B filter-36-IV R '(different red) filter-50 One-dimensional sensor-51 One-dimensional sensor-50 reading Means 52 Parallel moving means of one-dimensional sensor 50 53 Reading condition setting circuit of reading means 51 Motor for driving parallel moving means 52 5 , 55, 56, 57 One-dimensional sensor element with filter attached 70 A / D conversion circuit 90 System controller 100 Image memory 110 I / F circuit 121 Type V infrared cut filter 122 Type VI red Outer cut filter 123 Infrared cut filter-exchange means 124 Same drive motor 130 Film holding means 141 Type setting switches 142 to 145 Condition setting switches 501,502,503 Surface interference type mirrors 504,505,506,507 Two-dimensional Sensor-520,521 Changeover switch

Claims (3)

[Claims] 1. A holding means for holding a color photographic film, an image forming means for forming a color image of the color photographic film, and a plurality of wavelength components I, II for forming the color image by the image forming means. , III, IV, a color photographic film reading apparatus including a decomposing means for decomposing the image components, an image capturing means for inputting and reading the image components after the decomposing, and a control device for controlling these, wherein the decomposing means is an optical device. While using the filter, set the range I, II, III, IV of the wavelength component of the color to be separated,
I, I depending on the type of color photographic film to be decomposed
A color photographic film reader having means for changing to either I, III or IV, II, III. 2. A holding means for holding a color photographic film, an image forming means for forming a color image of the color photographic film, and a plurality of wavelength components I and II for forming the color image by the image forming means. , III, IV, a color photographic film reading apparatus including a decomposing means for decomposing the image components, an image capturing means for inputting and reading the image components after the decomposing, and a control device for controlling these, wherein the decomposing means emits light. A light source whose characteristics can be changed is used, and the range I, II, III, IV of the wavelength components of the color to be resolved is used.
A color photographic film reader having means for changing the setting of No. 1 to any one of I, II, III or IV, II, III depending on the type of color photographic film to be disassembled. 3. A holding means for holding the color photographic film, an image forming means for forming a color image of the color photographic film, and a plurality of wavelength components I, II for forming the color image by the image forming means. , III, IV, a color photographic film reading apparatus including a decomposing means for decomposing the image components, an image capturing means for inputting and reading the image components after the decomposing, and a control device for controlling these, wherein the decomposing means emits light. A light source whose characteristics are changed and an optical filter are used in combination, and the ranges I, II, III, and IV of the wavelength components of the color to be decomposed are set according to the type of the color photographic film to be decomposed. , II, III or
A color photographic film reader having a means for changing to any one of IV, II and III.