JP3209739B2 - Image processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image processing apparatus for processing an image on a photographic film.

[Conventional technology]

2. Description of the Related Art A conventional image forming apparatus, for example, a copying machine with a projector, changes the way of processing an image signal depending on the type of photographic film to be copied (color negative, color positive, white / black negative, and white / black positive). Was input using a button or the like.

[Problems to be solved by the invention]

However, the operation was troublesome and troublesome for the user.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image processing apparatus which solves the above-described problems and can automatically and quickly determine the type of film.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides an input unit for inputting image data obtained by reading a non-image portion of a film, and an image data input by the input unit. A generation means for generating a maximum value and a minimum value of a plurality of color component values, and a determination table for inputting the maximum value and the minimum value, wherein the type of the film is a color negative film, color or white. A black / positive film or a white / black negative film; and an image processing unit for processing an image based on a result of the determination by the determination unit. .

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. This is an example of a digital color copier with a projector.
0, an image scanner unit 201, and a printer unit 202.

(Projector unit 150) The projector unit 150 illuminates the photographic film 154 and forms an image on the platen glass 203 of the image scanner unit 201. The halogen lamp 152 and the condenser lens 15
3. It is composed of a projector lens 156, a mirror 107, and a Fresnel lens. Film 154 is fourth
It is set on the carrier shown in the figure.

The light from the halogen lamp 152 passes through the condenser lens 153
The film 154 is irradiated with the collected light. The light transmitted through the film 154 is the projector lens 1
After being condensed by 56, the optical path is bent by mirror 107 and collimated by Fresnel lens 108.

The film formed on the Fresnel lens 108 is as shown by the solid line in FIG. At the start of reading, the mirror 206 is moved by the pulse motor 114 to a position where an unexposed portion of the film, which is indicated by a hatched portion in FIG. (Image Scanner Unit 201) The image scanner unit 201 reads an image formed on the platen glass 203, and folds the light path from the image formed on the platen glass 203 by mirrors 206, 207, and 208. The light is guided to a three-line sensor (hereinafter, referred to as a CCD) via a lens 209. The moving speed of the illumination lamp 205 and the mirror 206 at the time of 1: 1 copying is V,
The moving speed of the mirrors 207 and 208 is V / 2.

The CCD 210 scans in the direction in which the optical unit moves, that is, in the direction orthogonal to the sub-scanning direction, that is, in the main scanning direction.

211 is a signal processing unit, full color information from the CCD 210,
That is, red (R), green (G), and blue (B) components are decomposed into magenta (M), cyan (C), yellow (Y), and black (Bk) components.

(Printer Unit 202) The printer unit 202 prints out a photographic film image read by the image scanner unit 201 on paper in full color.

213 is a semiconductor laser. 212 is a laser driver,
The semiconductor laser 213 is modulated and driven according to the M, C, Y, and Bk image signals from the signal processing unit 211. The laser beam from the semiconductor laser 213 is guided onto the photosensitive drum 217 via the polygon mirror 214, the f-θ lens 215, and the mirror 216.

Reference numeral 218 denotes a rotary developing unit, which includes a magenta developing unit 219, a cyan developing unit 220, a yellow developing unit 221, and a black developing unit 222.
And develops the electrostatic latent image formed on the photosensitive drum 217 with toner. A transfer drum 223 transfers the toner image on the photosensitive drum 217 to recording paper. A fixing unit 226 fixes a transferred image on a recording sheet. Reference numerals 224 and 225 denote cassettes for storing recording paper.

 FIG. 2 shows the configuration of the first illustrated signal processing unit 211.

2, the same parts as those in FIG. 1 are denoted by the same reference numerals. A CCD reading unit 101 amplifies the R, G, B signals from the CCD 210 and converts them into 8-bit digital signals. Reference numeral 102 denotes a shading correction unit which performs shading correction for each color. Reference numeral 103 denotes a shift memory which corrects a shift between colors and pixels of a signal subjected to shading correction. 104 is a LOG conversion unit, a color judgment unit
112 and logarithmic correction for light / density conversion. Reference numeral 105 denotes a black generation unit that generates a black signal (Bk) from the density signals Y, M, and C from the LOG conversion unit 104. The black signal Bk is generated from Min (Y, M, C), for example. 106
Is a masking / UCR unit, which corrects the filter characteristics and toner density characteristics of the CCD 210 for the Y, M, C, and Bk signals from the black generation unit 105, removes undercolor, and then develops among the four color signals. One color to be selected. A density conversion unit 107 converts the density in accordance with the development characteristics of the printer unit 202 and the preference of the operator. Reference numeral 109 denotes a synchronization signal generation unit, which is a horizontal synchronization signal BD (beam detect) signal and a vertical synchronization signal ITOP (image top) from the printer unit 202.
A horizontal synchronizing signal HSYNC and a pixel synchronizing signal CLK used in the image scanner unit 201 are generated based on the signal, and output to each processing unit and the CPU 113. An original position detection unit 110 detects the position and size of the original based on the binary signal of the G signal after the shading correction. 111
Is a conversion / movement processing unit for controlling the writing and reading cycle and timing of data to and from the shift memory 103 to convert and move an image. Reference numeral 113 denotes a CPU, which includes a microprocessor, an I / O circuit, a timer circuit, an interrupt control circuit, a serial communication circuit, a ROM, a RAM, and the like, and controls the above-described processing units. The CPU unit 113 controls a pulse motor 114 for driving the optical system, a document illumination lamp 205, a sensor 116 for detecting the position of the optical system, and an operation unit 117. The CPU unit 113 reads several tens of the pixels constituting the hatched portion shown in FIG. 5, and determines whether the film is a color negative film, a white / black negative film, a color or a white / black positive film based on the density distribution of the read pixels. Determines whether the film is a film, and determines the LO of the LOG conversion unit 104 according to the determined film type.
The G table and the masking table of the masking / UCR section 106 are switched to those suitable for the type of film. Thereby, processing suitable for the type of film is executed. 112 is a color determination unit for determining the film type,
The configuration is shown in FIG.

In FIG. 3, reference numeral 179 denotes a Min (R, G, B) generation circuit,
Min (R, G, B) is obtained from G and B. 180 is Max
The (R, G, B) generation circuit calculates Max (R, G, B) from R, G, B.

Reference numeral 185 is a judgment threshold value table stored in the memory.

The density of the black / white film is theoretically distributed on a straight line, but in fact, as shown in FIG. 6, it is distributed in a region surrounded by the straight line and the curve Q, that is, a hatched region. In FIG. 6, the straight line is Min (R, G, B) = Max (R, G, B),
This straight line is achromatic, and the more it goes in the direction of arrow C,
As it approaches black, the origin, Min (R, G, B) = Max (R,
(G, B) = 0 is theoretically perfect black, and approaches white in the direction of arrow D.

Further, as the chromatic color increases in the photographic film, the distribution spreads in the direction F in FIG.
A region surrounded by a straight line Min (R, G, B) = Max (R, G, B) and a curve P is obtained.

Therefore, the judgment threshold value table 185 indicates that the straight line Min (R, G, B)
= Max (R, G, B) and the area surrounded by the threshold curve Q determined by the experiment is defined as an achromatic area, and the area near black in the achromatic area, that is, the area L is set to “01”, A region close to white in the chromatic region, that is, the region U is “10”, a region between black and white in the achromatic region, that is, the region M is “11”, and a region outside the achromatic region is “00”. There is. The determination threshold table 185 indicates that the R signal 176, the G signal 177, and the B signal 178 are respectively
In the case of 8 bits, a Min (R, G, B) signal 181 and a Max (R, G,
B) Since the signal 182 is also 8 bits, a table for 16-bit input is included.

A chromatic / achromatic determining unit 183 determines whether the read pixel is chromatic or achromatic based on the determination threshold table 185.

Since the image forming apparatus of this embodiment is configured as described above, (1) several tens of pixels in a hatched portion shown in FIG.
The point determined by Max (R, G, B) and Min (R, G, B) is the sixth
If it is outside the shaded area shown in the figure, it is "00", so it is judged as a color negative film. (2) The point determined by Max (R, G, B) and Min (R, G, B) If it is in the area L shown in FIG. 6, it is "01", so it is determined that the film is a color or white / black positive film. (3) Max (R, G, B), Min (R, G, If the point determined by B) is within the area U shown in FIG. 6, it is “10”, so it is determined that the film is a black / white negative film, and the Log table of the Log conversion unit 104 and the masking / UCR unit 106 Switch the masking table.

In the case of the above (3), a white / black negative film is determined because, in an unexposed portion of the photographic film, the color negative film has an orange color, that is, a chromatic color due to color masking. This is because the white / black positive film is black and the white / black negative film has a light gray base film.

In addition, since the boss film mounted on the frame cannot be set in a film carrier as shown in FIG. 4, that is, cannot be sandwiched, notches are provided in an adapter for a film carrier and a changer for a positive film, and these notches are provided. The detection may be performed by a microswitch provided in the projector, and whether the image is negative or positive may be determined according to the detection result. In this case, after determining negative or positive, it may be determined whether white / black or color.

In this embodiment, an example in which an image is projected by a projector has been described.However, a medium- or large-size color negative film or color positive film adhered to a platen glass is illuminated by a projector, and in the case of a color negative film, an image is projected. Judge the orange non-image part outside the area,
In the case of a color positive film, a black non-image portion outside the image area may be determined.

Furthermore, in the case of OHP paper with a frame, the frame portion does not transmit light and is determined to be a color positive film, but there is no problem.

〔The invention's effect〕

As described above, according to the present invention, based on the maximum value and the minimum value of a plurality of color component values constituting the image data of the non-image portion of the film, whether the type of the film is a color negative film using the determination table, Since it is determined whether the film is a color or white / black positive film or a white / black negative film, the type of the film is automatically determined easily and at high speed.

Furthermore, since the judgment table which inputs the maximum value and the minimum value of the plurality of color component values constituting the image data of the non-image portion is used, when the judgment table which inputs all of the plurality of color component data is used. As compared with the above, the memory capacity used in the determination table can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing the structure of one embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a first illustrated signal processing unit 211, and FIG. 3 is a block diagram showing a configuration of a second illustrated color determination unit 112. Fig. 4 is an external view showing an example of a carrier for 6 frames of film, Fig. 5 is a view showing an example of an image projected on the Fresnel lens 108, and Fig. 6 is for chromatic / achromatic / negative / positive judgment. FIG. 210: 3 line sensor, 101: CCD reading unit, 102: Shading correction unit, 103: Shift memory unit, 104: LOG conversion unit, 105: Black generation unit, 106: Masking / UCR unit 107, a density conversion unit, 110, a document position detection unit, 111, a magnification change movement processing unit, 112, a color determination unit.

Claims (1)

(57) [Claims] An input unit for inputting image data obtained by reading a non-image portion of a film; and generating a maximum value and a minimum value of a plurality of color component values constituting the image data input by the input unit. Generating means, and using a determination table that receives the maximum value and the minimum value as input, whether the type of the film is a color negative film, a color or white / black positive film, or a white / black negative film An image processing apparatus comprising: a determination unit configured to determine whether there is an image; and an image processing unit configured to process an image based on a determination result of the determination unit.