JPH1096996A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera capable of more accurately predicting the exposed state of a sliver salt film. SOLUTION: A camera capable of exposing the film 25 with a subject and executing photoelectric conversion by an image sensor 14 is provided with an LCD monitor 13 for displaying the subject, a switch input part, 41 for manually setting an exposure mode at the time of exposing the film 25, a signal processing circuit 11 for converting a photoelectric conversion signal from the image sensor 14 into an image almost equal to an image by photographing in the exposure mode, in accordance with the conversion characteristics of the image sensor 14, the film 25 and the LCD monitor 13, to output the image to the LCD monitor 13, a CPU 40 and an EEPROM 42 for storing a conversion coefficient or table involved in the conversion characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera capable of exposing a subject image to a silver halide film and having an image pickup means for converting the subject image into an image signal.

[0002]

2. Description of the Related Art A camera capable of exposing a subject image to a silver halide film and having an image pickup means for converting the subject image into an image signal has been conventionally known, for example, from Japanese Patent Laid-Open No. 6-214
No. 307, which has the advantage that only one device is required when, for example, simultaneous video and photo shooting are desired.

In an apparatus capable of simultaneously performing silver halide photography and electronic image photography, by setting photography conditions for photography and video data to be the same, it is possible to achieve almost the same purpose when photographing the same scene. It is said that it will be possible to take a photograph.

[0004] Further, a camera for displaying in advance a finishing condition of a photograph on an image photographed on a silver halide film on a monitor device is disclosed in JP-A-60-190077. Since the finished state can be checked before the film is developed, it is easy to take a photograph according to the photographer's intention.

[0005] Here, when photographing by silver halide photography is the main purpose, it is required for the camera to photograph under conditions utilizing the effects of photographing. In other words, the camera is required to take a photograph intended by the photographer by making use of an exposure effect that meets the conditions of the main subject, that is, an aperture effect, a shutter speed effect, an exposure correction effect, and the like.

Normally, these conditions are often determined by experienced photographers based on their experience, but it is difficult for photographers who have little experience or knowledge of photography to determine their own conditions.

In order to cope with such photographers who have little experience or knowledge of photographing, a camera having an exposure mode programmed in advance so as to be able to take a photograph close to the conditions suitable for the photographing scene has been provided. It is commercially available, and if the photographer selects the exposure mode, the camera automatically performs operations such as pressing the shutter button in order to automatically determine and set shooting conditions such as the combination of aperture and shutter speed. For example, it is possible to take a picture.

[0008]

However, in the conventional example described in the above-mentioned Japanese Patent Application Laid-Open No. 6-214307, when a photographer selects a photographing condition and performs photographing, the completion of the photographed photograph is judged. Difficult to do. In particular, it is extremely difficult for a beginner to determine what a captured image will look like. Even if it is a skilled person, whether or not it was possible to shoot in the intended state without finally developing the film, that is, how much it actually depends on the exposure, aperture, shutter speed that was set intentionally It cannot be clearly determined whether or not each of the effects has been obtained.

Further, in the apparatus described in Japanese Patent Application Laid-Open No. Sho 60-190077, although the finished state of the photograph is reproduced, only the brightness of the monitor screen is changed in accordance with the shutter speed or the like. , Film, image sensor,
The conversion characteristics of the monitor were not taken into consideration, and the finished state of the photograph could not be sufficiently reproduced. Further, when the subject is a moving object, there is a change such as a screen flowing according to the shutter speed, but this point is not considered.

The present invention has been made in view of the above circumstances, and has as its object to provide a camera that can more accurately predict the exposure state of a silver halide film.

[0011]

In order to achieve the above object, a camera according to a first aspect of the present invention comprises an image pickup means capable of exposing a subject image to a silver halide film and converting the subject image into an image signal. A camera having a monitor for displaying an image signal based on the subject image, an exposure mode setting means for manually setting an exposure mode when exposing the silver halide film, and an image taken by the exposure mode. Signal converting means for converting a photoelectric conversion signal output from the imaging means in accordance with conversion characteristics of the imaging means, the silver halide film and the monitoring means, and outputting the converted signal to the monitoring means.

The camera according to a second aspect of the present invention is the camera according to the first aspect, wherein the signal conversion means comprises:
There is provided storage means for storing a conversion coefficient for performing a conversion operation for performing the conversion in accordance with the conversion characteristic or a table for the conversion.

Further, a camera according to a third aspect of the present invention is a camera which is capable of exposing a subject image to a silver halide film and has an image pickup means for converting the subject image into an image signal. Means,
Shutter speed value output means for outputting a shutter speed value when the silver halide film is exposed; and monitor means for outputting an image signal corresponding to an image to be exposed according to the shutter speed value output from the shutter speed value output means. And image signal output means for outputting the image signal.

Accordingly, the camera according to the first aspect of the present invention has an image pickup means capable of exposing a subject image to a silver halide film and converting the subject image into an image signal. When the mode is manually set by the exposure mode setting unit, the signal conversion unit outputs an image captured by the exposure mode according to the conversion characteristics of the imaging unit, the silver halide film, and the monitor unit. Is converted and output to the monitor means, and the monitor means displays an image signal based on the subject image.

In the camera according to a second aspect of the present invention, the storage means of the signal conversion means stores a conversion coefficient or a table for the conversion for performing the conversion according to the conversion characteristic. Remember.

Further, a camera according to a third aspect of the present invention has an image pickup means capable of exposing a subject image to a silver halide film and converting the subject image into an image signal, and a shutter speed value output means comprising the silver halide film. And outputting an image signal corresponding to an image to be exposed in accordance with the shutter speed value output from the shutter speed value output unit to the monitor unit. The means displays the subject image.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 show a first embodiment of the present invention, and FIG. 1 is a block diagram showing a configuration of a camera.

This camera controls an image sensor 2 serving as an image pickup means for receiving a light beam equivalent to a light beam from a system for exposing a silver halide photographic film (not shown) and converting the light beam into an electric signal, and controls the operation of the image sensor 2. And a signal processing circuit 3 for processing a signal obtained from the image sensor 2.
A non-volatile memory 6 for recording an output signal of the image sensor 2 processed by the signal processing circuit 3 in accordance with a photographing timing, a photometric sensor processing circuit 4 for outputting information relating to a photometric value and exposure, EEPRO as storage means for storing information related to recording and digital recording
M9; an aperture drive circuit 7 for driving an aperture for defining a light beam incident on the image sensor 2; a switch input unit 8 for performing various settings and inputs related to the camera including an exposure mode by a photographer's operation; An LCD monitor 1 serving as an image display unit which is a monitor means for displaying a subject image which has been processed by the processing circuit 3 and has been subjected to correction of display characteristics and the like; the signal processing circuit 3; a photometric sensor processing circuit 4; , Aperture drive circuit 7, switch input section 8,
Connected to the EEPROM 9 via a data bus,
It has a CPU 5 which is a signal conversion means for controlling the image sensor 2 and the LCD monitor 1 and other various circuits, and which processes the input from these and controls the same. I have.

When photographing on a silver halide film, an LCD
If only displaying on the monitor 1 is sufficient, the nonvolatile memory 6
It is not necessary to provide.

Next, the operation of such a camera is as follows.

The subject image photoelectrically converted by the image sensor 2 is subjected to various processes by a signal processing circuit 3 and is converted into digital information.

On the other hand, information relating to the exposure mode selected by the photographer from the information input from the switch input unit 8 is read, and the photometric value and the exposure obtained by the photometric sensor processing circuit 4 are determined according to the set exposure mode. From the information, the CPU 5 calculates an exposure condition for performing silver halide photography.

The CPU 5 further controls the accumulation of the image sensor 2 based on the information stored in the EEPROM 9 so that the conditions at the time of the silver halide photographing and the optical characteristics of the image sensor output become substantially equivalent. Signal processing circuit 3
Or processing the output signal of the image sensor 2 or driving the aperture to an aperture value at which an equivalent aperture effect can be obtained by the aperture drive circuit 7.

The digital output obtained by the above processing is further corrected on the basis of the display characteristics of the LCD monitor 1, and an image having characteristics substantially equivalent to the image at the time of silver halide photography is reproduced on the LCD monitor 1. .

In this manner, actual silver halide photography can be performed with reference to an image having characteristics substantially equivalent to the image obtained when photographing silver halide.

FIG. 2 is a block diagram showing a more specific configuration of the camera shown in FIG.

The luminous flux of the subject is made incident through a plurality of photographing lenses 20 and 22 and an optical diaphragm 21 disposed between the lenses 20 and 22.

The movable mirror 23 is rotated and driven by the control of the mirror driving circuit 32, and is raised when the film 25 described later is exposed, so that the movable lens 23 is raised.
When the image sensor 14 is retracted from the optical axes 0 and 22 and photoelectrically converts the subject image by an image sensor 14 described later, the subject light is reflected upward on the optical axis.

The movable mirror 23 is retracted from the optical axis, and the shutter 24 is controlled by the shutter driving circuit 34.
When the is open, the subject image is exposed on the film 25.

In the above description, the photographing lenses 20, 22
Is driven and controlled by a zoom / focus drive circuit 30, and the optical aperture 21 is driven and controlled by an aperture drive circuit 31, respectively.

The movable mirror 23 has a central portion formed as a half mirror, and a sub-mirror 27 is disposed on the back side of the central portion serving as the half mirror.

The light beam reflected by the sub-mirror 27 passes through an AF optical system 28 including a pair of separator optics and enters a light receiving portion of an AF sensor 29. The AF sensor 29 is composed of, for example, a line sensor, and is driven by a line sensor drive circuit 33.

In such an AF detection system, an in-focus driving amount is obtained by a later-described CPU 40 from a shift amount and a shift direction of two images having distance information by a known phase difference method, and a photographing lens is obtained based on the result. 20 and 22 are driven to a focus position.

That is, each lens 2 of the photographing lens
Reference numerals 0 and 22 are driven by the zoom / focus drive circuit 30 which controls a drive source for focus adjustment and zooming. The zoom / focus drive circuit 30 includes an encoder (not shown) that generates a signal in accordance with the movement of each of the lenses 20 and 22.
The CPU 40 controls the lens drive based on the calculated focus drive amount based on the output of the encoder.

The light beam reflected by the movable mirror 23 is imaged by the relay lens 16 on the image sensor 14 constituted by, for example, an area sensor. The image sensor 14 is provided to convert a subject image into an electric signal and display or record a digital image as described later.

The image sensor 14 is connected to the CPU 4
Drive control is performed by the area sensor drive circuit 12 based on the 0 command. The subject image photoelectrically converted by the image sensor 14 is input to the signal processing circuit 11 as an analog signal, subjected to predetermined signal processing and converted into a digital signal, and the result is converted to a video memory 10 and a nonvolatile memory. 39.

The data stored in the video memory 10 is the monitor means and the LCD monitor 1 as the image display means.
3 is used to indicate.

The nonvolatile memory 39 is provided so as to be freely mounted on the camera body, and is used for recording an electronic image.

The relay lens 16 and the image sensor 1
A half mirror 15 is disposed between the light source 4 and the light source 4 so as to split the light beam in two directions. The other light beam is incident on a split-type photometric sensor 18 via a condenser lens 17.

The output of the photometric sensor 18 is processed by the photometric sensor processing circuit 19 and output to the CPU 40 as photometric data.

A magnetic recording layer is formed on the film 25, and a magnetic head 26 is arranged so as to be in contact with the magnetic recording layer. This magnetic head 26
Are driven by a magnetic head drive circuit 35.

Further, a film drive circuit 36 is provided in the camera body, and when the photographing of one frame is completed, the film 25 is wound up.

On the other hand, a strobe light emitting unit (not shown) as an auxiliary light source is controlled by a strobe circuit 38.

The EEPROM 42 as storage means stores information relating to silver halide recording and digital recording as will be described in detail later, and is used for correction.

The above-described signal processing circuit 11, EEPROM
42, strobe circuit 38, photometric sensor processing circuit 19, non-volatile memory 39, CPU 40, magnetic head drive circuit 3
5. The film drive circuit 36, the shutter drive circuit 34, the line sensor drive circuit 33, the mirror drive circuit 32, the aperture drive circuit 31, and the zoom / focus drive circuit 30 are connected to each other via a data bus 37, To give and receive. The operation of these drive circuits is configured to be performed by the CPU 40, which is a signal conversion unit and an image signal output unit.

A switch input unit 41 is connected to the CPU 40 so that various inputs including selection of an exposure mode are performed by a photographer's operation.

FIG. 3 is a diagram summarizing the contents relating to the exposure mode in the information input from the switch input section 41. There are 8 exposure modes in total.
There are the following modes corresponding to the respective values 0 to 7 of the mode flag (MODE).

0: Full auto program mode (P) 1: Sports mode 2: Portrait mode 3: Landscape mode 4: Night view mode 5: Shutter speed priority auto mode (S) 6: Aperture priority auto mode (A) 7: Manual mode (M) Of these, the full auto program mode, sports mode, portrait mode, landscape mode, and night view mode are five program modes, and there are four program patterns as shown in FIG. . In FIG. 4, the vertical axis indicates the aperture value (AV), and the horizontal axis indicates the shutter speed value (TV).

FIG. 4A shows a program pattern P0 in the full-automatic program mode. To explain from a brighter one, first, the aperture is increased and the shutter speed is decreased as the darker, but the flash synchronization is reached. At this point, the aperture is opened, and when it is darker than the flash synchronization time, the aperture is kept open and only the shutter speed is reduced.

Next, FIG. 4B shows a program pattern P1 in the sports mode and the portrait mode. As the program becomes darker from the brighter one, the aperture is first opened to the release side, in other words, the shutter speed is increased. It has the characteristic of controlling so that

FIG. 4C shows a program pattern P2 in the landscape mode. When the shutter speed is relatively bright, the shutter speed is reduced while the aperture is kept down, and when the shutter speed reaches the flash synchronization time. This time, it has the characteristic of opening the aperture while keeping the shutter speed unchanged.

FIG. 4D shows a program pattern P3 in the night view mode.
Although the program pattern is similar to the program pattern of the full auto program mode shown in (A), the full auto program mode is controlled so as to have an appropriate exposure amount. The characteristics are such that the atmosphere of the night view can be expressed well, with the amount slightly lower than the amount.

Returning to FIG. 3, the relationship between each exposure mode and photometry will be described.

The spot metering is a function for measuring the illuminance of a portion of the subject to be measured by the photographer and reflecting the illuminance on the exposure, and is effective in all modes other than the night view mode. The spot metering is performed by pressing a spot metering button (not shown) in accordance with the spot metering area of the subject to be measured, and the spot metering is canceled by pressing the spot metering button.

The photometry method includes a program mode,
The method of processing the output of the photometric sensor 18 is different between the automatic mode and the manual mode.

The photometric sensor 18 of this embodiment divides the photographing screen into a central portion and a peripheral portion, and uses a sensor of which a photometric value is output from each of them. It is a known thing used,
There are two photometric calculation methods as shown in FIG.

FIG. 5A shows a center-weighted average photometry (AV
E), and among the exposure modes described above,
This is applied in the shutter speed priority auto mode, the aperture priority auto mode, and the manual mode. As shown in the figure, an average process is performed using the sensor outputs of the two divisions as they are.

FIG. 5B shows fuzzy ESP photometry, which is applied in a program mode other than the above. As shown in the figure, weighting is determined by performing a fuzzy operation on the sensor outputs divided into two.

Next, FIG. 6 shows (A) film 25, (B)
FIG. 4 is a diagram in which output characteristics of an image sensor 14 and (C) LCD monitor 13 with respect to an incident light amount are each divided into four and represented by approximate straight lines. Strictly speaking, a plurality of characteristics as shown in the figure may be given for each color. However, here, a case where the colors are not classified for simplification of description will be described.

LCD monitor 13 and image sensor 14
In general, the characteristics differ depending on the combination. However, in the present embodiment, the characteristics of the two can be determined including the variation since they are incorporated in the camera.

On the other hand, the characteristics of the film 25 are not uniformly determined because they differ depending on the film used.
To cope with this, data of a commonly used film and a film having a high possibility of being used are stored in the EEPROM 42 in advance.

As for the brightness characteristics with respect to the incident light, the characteristics of the film are F (B), and the characteristics of the image sensor 14 are S
Assuming that (B) and the characteristic of the monitor are M (B), the output at the time of reproduction for each of the brightness (B0) of the image information at a certain position is:

## EQU1 ## Luminance reproduction value on film: Bf = F (k × B0) (Equation 1)

## EQU2 ## Brightness reproduction value of sensor output: Bs = S (j × B0) (Equation 2)

## EQU3 ## The luminance reproduction value of the monitor output: Bm = M (Bs) (Equation 3)

Since these equations are higher-order functions with respect to ideal characteristic curves, the calculation scale of a microcomputer used for a camera is too large. Therefore, as shown in FIG. 6, each characteristic curve is divided into a plurality of regions, and a function that is linearly approximated for each region is newly created. Each characteristic at this time can be expressed by the following equations.

[0064]

## EQU4 ## Brightness reproduction value on film: Bf = Fi × k × B0 + fi (Equation 4)

## EQU5 ## The luminance reproduction value of the sensor output: Bs = Si × j × B0 + si (Equation 5)

## EQU6 ## The luminance reproduction value of the monitor output: Bm = Mi.times.Bs + mi = Mi.times.Si.times.x.times.B0 + mi '(Equation 6) where Fi, Si, and Mi (i = 1 to 4) The slope (approximate value) of the characteristic curve of the area, fi, si
, Mi (i = 1 to 4) are offset values of the respective approximate values, and mi 'is mi + Mi * si.

From the above equation (5),

B0 = (Bs−si) / (Si × j) (Equation 7) Multiply both sides by a constant k,

K × B0 = k × (Bs−si) / (Si × j) (Expression 8) From this value, the coefficient Fi can be selected. Therefore, the luminance reproduction value Bf on the film can be determined.

In order to reproduce the luminance on the film 25 on the LCD monitor 13, from the equations (8) and (4),

Bm = Bf = Fi × k × (Bs−si) / (Si × j) + fi The value of the magnitude of the right side of Expression 9 expressed by Expression 9 is calculated with respect to the output of the signal processing circuit 11. And the result is again processed by the CPU 40, and the result is again transmitted to the video memory 1 via the signal processing circuit 11.
Send to 0 and store.

The LCD monitor 13 displays an image substantially equivalent to the image exposed on the film 25 in order to perform display based on the values corrected in consideration of the characteristics stored in the video memory 10 in this manner. be able to.

FIG. 8 is a flowchart showing the operation of the CPU 40 of the present embodiment.

First, various correction values and coefficients used for display conversion are read from the EEPROM 42 (step S1).

Next, the film 25 used is determined, and the film data corresponding to the film is used. If no film is mounted, the standard film data is used (step S).
2).

Subsequently, the luminance of the subject is measured by the photometric sensor 18 (step S3).
Is read (step S4), and it is determined which exposure mode the photographer has selected (step S5).

Then, it is checked whether or not the photographer has selected the spot metering method as the metering method by checking whether 1 is set in the flag SPOT (step S6). When the spot metering is selected, the brightness is represented. Apex (B
V) The spot photometric data (BVSP) is substituted for the value (step S7).

On the other hand, if it is determined in step S6 that the spot metering has not been selected, it is checked whether or not the calculation (ECAL) in the selected exposure mode is a calculation by ESP metering (step S8). ), If it is ESP metering, the value BVESP obtained by ESP calculation is substituted for the BV value (step S9).

In step S8, the ESP
When it is determined that the calculation is not based on photometry, the value BVAVE based on the average photometry calculation is substituted (step S10).

When any one of the steps S7, S9 and S10 is completed, it is checked whether or not the exposure correction flag FCV is 1 (step S11).
That is, when an instruction for exposure correction has been issued, the TV value is shifted by the number of steps corresponding to the instructed correction value (step S12).
Proceed to the following steps.

The above description is based on the image photographed on the film 25 and the L
This is a process for performing control so that the brightness of the display on the CD monitor 13 is equivalent to that of the display.

In taking a silver halide photograph, not only the luminance but also other factors which affect the expression such as the aperture effect and the shutter speed effect become important. The process described below is a process for appropriately reproducing on the LCD monitor 13 in consideration of these factors.

First, the mode flag MO indicating the exposure mode is set.
It is determined whether DE is 5 or less (step S1).
3). Here, when the mode flag MODE is larger than 5, that is, when the exposure mode is the aperture priority auto mode or the manual mode, the effect of the aperture is displayed on the LCD.
It is important that the information can be confirmed by the monitor 13. Therefore, the aperture value (A) is set so that the aperture effect at the set aperture value at the time of shooting and the display on the LCD monitor 13 have equivalent characteristics.
V) is set (step S14).

Thereafter, it is determined whether or not the mode flag MODE is 7 (step S15).
When ODE is 7, that is, when the exposure mode is the manual mode, or when the mode flag MODE is 5 or less in step S13, the accumulation mode of the image sensor 14 is changed (step S16).

The accumulation mode includes a normal accumulation mode as shown in FIG. 7E and an electronic shutter accumulation mode as shown in FIG. 7F. FIG. 7 is a time chart showing each output.

The accumulation operation for each line of the image sensor 14 as an area sensor is almost the same as the exposure operation in the vertically running shutter operation in silver halide photography. Therefore, the normal integration operation generates a line transfer signal TR [FIG. 7 (D)] and a line reset signal RS [FIG. 7 (E)] synchronized with the horizontal synchronization signal HB [FIG. 7 (B)]. , The reset signal R
From S, the accumulation time t for one line is the time shown in the figure.

On the other hand, in the electronic shutter accumulation mode, as shown by a reset signal RSH shown in FIG. 7 (F), the readout line is reset by a time t before the line is read out. This is t.
That is, since the accumulation is performed only for a short time, an effect equivalent to that of the high-speed shutter can be obtained.

FIG. 7A shows the signal output OS, and FIG.
(C) shows the vertical synchronization signal VB.

Returning to the flowchart of FIG. 8 again, after changing the accumulation mode in step S16, it is checked whether or not the maximum value Vmax of the signal output OS exceeds a predetermined level Vth (step S17).

Here, if it is determined that the voltage does not reach the predetermined level Vth, the signal is amplified (step S1).
8). This processing is performed when the luminance of the subject is darker than the sensor accumulation time and a proper signal cannot be obtained as a signal to the LCD monitor 13. The gain of the amplifier (not shown) provided in the signal processing circuit 11 is Is increased and adjusted to an appropriate value based on the maximum value Vmax.

Then, it is determined whether or not the maximum value of the amplified output signal has reached the predetermined level Vth again (step S19). At this time, if the signal level is further lower than the amplification factor, the signal level exceeds the adjustment range of the signal processing circuit 11, so that it becomes impossible to perform appropriate reproduction. Therefore, in this case, a warning is given to the photographer that a display equivalent to the silver halide photographing data cannot be performed (step S20).

The determination in step S19 is not only a result of amplifying the output signal, but also when the set shutter speed is sufficiently low and the brightness of the subject is relatively dark. It is also possible to judge from conditions.

If the mode flag MODE is not 7 in the step S15, if the maximum value Vmax has reached the predetermined level Vth in the step S17, if it has reached the predetermined level in the step S18, or if the step S20 When a warning is issued in step (1), the signal output OS is converted into a digital output by the method described above (step S21), and the LCD monitor 1
3 (step S22).

The output signal to the LCD monitor 13 is adjusted in consideration of the correction information and the like (step S23), so that the LCD monitor 13 performs reproduction having information substantially equivalent to the result of silver halide photography. be able to.

According to the first embodiment, in order to perform electronic reproduction in accordance with the selected exposure mode of silver halide photography, an exposure effect substantially equivalent to the photographed image is previously obtained by the LCD monitor when photographing. It is possible to confirm whether or not a print having the intended aperture effect, shutter effect, exposure correction effect, and the like can be obtained.

Further, it is possible to select another exposure mode in accordance with the result of the confirmation, to compare the effects of the plurality of exposure modes, and the like, all before shooting, so that the film is wasted. It is possible to obtain a photograph as intended without missing or missing a photo opportunity.

In this way, it is possible to accurately reproduce and confirm the finished state of a photograph, which cannot be determined by the optical finder, using an LCD monitor, without requiring a special configuration.

FIGS. 9 and 10 show a second embodiment of the present invention. FIGS. 9A and 9B show output characteristics of (A) a film, (B) an image sensor, and (C) an LCD monitor, respectively. FIG. 10 is a diagram showing a table referred to in order to reproduce the luminance on the film on the LCD monitor. The table shown in FIG. 10 has data with 8-bit resolution for each axis of the diagram shown in FIG.

In the second embodiment, a means for referencing a table is used as a means for reproducing an image on a film as a monitor image substantially equivalently, and is similar to the above-described first embodiment. The description of the portions will be omitted, and only different points will be mainly described.

In this embodiment, a case will be described in which a table prepared for a color negative film is used.

First, based on the sensor output (Bs), FIG.
The corresponding incident light amount (j × B0) (corresponding to the position in FIG. 9B) is obtained by referring to the column of OUT (B) in the table of FIG.

Since the amount of incident light on the film 25 has a fixed ratio to the amount of incident light on the image sensor 14, the value obtained above is multiplied by a predetermined coefficient to obtain the amount of incident light on the film side (k × B0). ) Is required.

Next, the value of the film output (Fi) (corresponding to the position shown in FIG. 9A) with respect to the magnitude of the incident light quantity (k × B0) is shown in OUT (A) of the table of FIG.
Refer to the column below. This value represents the subject luminance reproduced on the film 25.

The film output (Fi) obtained above is L
An input (B) (corresponding to the position shown in FIG. 9C) which becomes a reproduction output on the CD monitor 13 is shown in FIG.
By referring to the column of OUT (C) in the table.

The conversion value to be displayed on the LCD monitor 13 is determined as described above.

By sending the input (B) thus obtained to the video memory 10 and displaying and reproducing it on the LCD monitor 13, a monitor image substantially equivalent to a film image can be observed.

If the film 25 is a reversal film, a reversal film column may be provided in the table of FIG. 10 and standard characteristic values of the reversal film may be stored in advance. In this case, compared to the case where the film 25 is a negative film,
Generally, the exposure latitude has a narrow characteristic.

[0103] Among the above films,
Since the characteristics differ depending on the film to be used, the approximate calculation as described in the first embodiment may be performed instead of referring to the table.

According to the second embodiment, substantially the same effects as those of the first embodiment can be obtained, and the data conversion for reproducing an image substantially equivalent to silver halide photography on the LCD monitor can be performed. Since the calculation is performed with reference to the conversion table stored in the EEPROM in advance, it is not necessary to calculate an approximate expression or perform a complicated calculation, thereby reducing the load on the CPU and shortening the time required for the calculation.

[Appendix] According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.

(1) In a camera capable of optically and electrically recording a captured image, an image display means for electrically displaying the captured image, and an exposure mode for selecting an exposure mode for silver halide photography Selection means, a silver halide film,
Display information storage means for storing information on the electronic image pickup device and the image display means in the form of a conversion approximate value or a table, and display using the display information storage means according to the mode selected by the exposure mode selection means. A camera comprising: display condition setting means for setting conditions.

As described above, in the camera described in (1), since the monitor is displayed under the conditions corresponding to the set exposure mode, it is possible to confirm the calculation effect for each exposure mode on the monitor.

(2) The camera according to (1), wherein the display information storage means stores approximate values of characteristics of the silver halide film, the electronic image pickup device, and the image display means.

(3) The camera according to (1), wherein the display information storage means stores characteristics of the silver halide film, the electronic image pickup device, and the image display means as table data.

(4) If it is determined that the set value of the display condition setting means has low reproducibility with respect to the optically recorded image, a warning is given when displaying on the image display means. The camera according to (1).

(5) In a camera capable of optically and electrically recording a captured image, an image display means for electrically displaying the captured image, and an exposure mode for selecting an exposure mode for silver halide photography. A camera comprising: a selection unit; and an imaging condition changing unit that selects and changes an imaging condition of an electrically captured image according to a selection of the exposure mode selection unit.

As described above, the camera described in (5) can reproduce the aperture effect and the shutter effect on the monitor to select the monitor image generation condition according to the selected photographing condition.

(6) The imaging condition changing means has at least one of a sensor control means, an optical control means such as an aperture, an image signal control means for controlling an amplification factor and the like, and an image signal calculation means. The camera according to (5), wherein the camera is configured as follows.

(7) The camera according to (1) or (5), wherein the exposure condition setting means has a plurality of program exposure modes.

(8) Silver halide exposure means for exposing a subject image to a silver halide film, imaging means for converting the subject image into an image signal, and display of the subject image based on the image signal from the imaging means. Monitor means, an exposure mode setting means for manually setting an exposure mode when exposing the silver halide film, and an image taken by the exposure mode, the imaging means, the silver halide film and the monitor. A camera, comprising: a signal conversion unit that converts a photoelectric conversion signal output from the imaging unit according to a conversion characteristic of the unit and outputs the converted signal to the monitor unit.

As described above, the present invention can be applied to a camera having no recording means for recording an image signal from an image pickup means.

[0117]

As described above, according to the camera of the present invention, the exposure state of the silver halide film can be more accurately predicted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a camera according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a more specific configuration of the camera according to the first embodiment.

FIG. 3 is a diagram showing details of an exposure mode input from a switch input unit in the first embodiment.

FIG. 4 is a diagram showing four types of program patterns in a program mode in the first embodiment.

FIG. 5 is a diagram showing photometric values obtained by (A) center-weighted average photometry and (B) fuzzy ESP photometry in the first embodiment.

FIG. 6 is a diagram showing approximate output characteristics of (A) a film, (B) an image sensor, and (C) an LCD monitor in the first embodiment.

FIG. 7 is a time chart showing each output of the first embodiment.

FIG. 8 is a flowchart showing the operation of the CPU according to the first embodiment.

FIG. 9 is a diagram showing output characteristics of (A) a film, (B) an image sensor, and (C) an LCD monitor in the second embodiment of the present invention.

FIG. 10 is a diagram showing a table referred to in order to reproduce the brightness of a film on an LCD monitor in the second embodiment.

[Explanation of symbols]

1,13 ... LCD monitor (monitor means, image display means) 2,14 ... image sensor (image pickup means, electronic image pickup device) 3,11 ... signal processing circuit (signal conversion means, image signal output means, image signal control means) 4, 19: photometric sensor processing circuit 5, 40: CPU (signal conversion means, image signal output means, shutter speed value output means, display condition setting means, imaging condition changing means, image signal calculation means) 8, 41: switch input Section (exposure mode setting means, exposure mode selection means) 9, 42 ... EEPROM (storage means, display information storage means) 12 ... area sensor drive circuit (sensor control means) 18 ... photometric sensor 20, 22 ... photographing lens (silver salt) Exposure means) 21 ... Aperture (optical control means, silver halide exposure means) 24 ... Shutter (silver halide exposure means) 25 ... Film (silver halide film)

Claims (3)

[Claims] 1. A camera capable of exposing a subject image to a silver halide film and having image pickup means for converting the subject image into an image signal, wherein a monitor means for displaying an image signal based on the subject image; Exposure mode setting means for manually setting an exposure mode when exposing the silver halide film, An image taken by the exposure mode, according to the conversion characteristics of the imaging means, the silver halide film and the monitor means, A camera, comprising: a signal conversion unit that converts a photoelectric conversion signal output from the imaging unit and outputs the converted signal to the monitor unit. 2. The signal conversion unit according to claim 1, further comprising a storage unit that stores a conversion coefficient for performing a conversion operation for performing the conversion in accordance with the conversion characteristic or a table for the conversion. The camera according to claim 1. 3. A camera capable of exposing a subject image to a silver halide film and having an image pickup means for converting the subject image into an image signal, wherein a monitor means for displaying the subject image; and the silver halide film. Shutter speed output means for outputting a shutter speed value at the time of exposure to light, and an image for outputting an image signal corresponding to an image exposed according to the shutter speed value output from the shutter speed value output means to the monitor means A camera comprising: signal output means;