JPH05107594A - Camera - Google Patents

Abstract

PURPOSE:To observe the difference in the finishing of a photograph before a photographing is executed by providing a means for correcting the monitor picture of an electronic view finder according to the characteristic of a usage film, and displaying the monitor picture. CONSTITUTION:This camera has the electronic view finder(EVF) and the means 18 correcting the monitor picture of the EVF according to the characteristic of the usage film inputted by a film characteristic input means 17, and displaying the picture screen. For instance, when the characteristic of the film is for a monochrome film, the monitor picture of the EVF is set in a monochrome mode. When the characteristic of the film is for the film having a spectral sensitivity characteristic, the RGB characteristic of the monitor picture of the EVF is corrected, and when the characteristic of the film is for the film having high sensitivity, the monitor picture of the EVF is set in a roughly reproducing mode. Therefore, a picture on which the difference in the characteristics of each film is corrected, can be confirmed before the photographing is actually executed.

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 having an electronic viewfinder.

[0002]

2. Description of the Related Art A camera having an electronic viewfinder (hereinafter referred to as "EVF") that captures an image of a photographing range by using an image pickup device such as a CCD and displays the image on a liquid crystal plate along with a conventional optical viewfinder. Many have been proposed. On the other hand, there are various types of films that can be used when shooting with a camera, and their characteristics include difference between black and white and color, ISO sensitivity, and spectral sensitivity. However, simply by monitoring and displaying the image in the shooting range, the finish of the photograph due to the difference in film characteristics as described above cannot be understood. That is, the finished state of the photographed image could not be observed with the conventional EVF.

[0003]

As described above, the difference in the finish of photographs due to the difference in the characteristics of the films used is
You can't usually see it in the viewfinder. For example, when an indoor photograph is taken using a tungsten type film, it is difficult to predict the finish of the photograph because the color development depends on the ratio of natural light to artificial light. In addition, when shooting with black and white film, it was similarly difficult to predict the finish. SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a camera having an EVF capable of correcting and displaying the above-described differences in film characteristics.

[0004]

In order to achieve the above object, the camera of the present invention has an EVF and a film characteristic input means, and the EVF of the EVF is adjusted according to the characteristics of the film used inputted from the input means. It has means for correcting and displaying the monitor screen. For example, when the film characteristic is black-and-white film, the EVF monitor screen is set to black-and-white mode, and when the film characteristic is a film having a spectral sensitivity characteristic, the EVF monitor screen RGB characteristic is changed. If the film characteristic is corrected and the film characteristic is high-sensitivity film, the monitor screen of the EVF is set to the rough reproduction mode.

[0005]

By doing so, it is possible to confirm the screen in which the differences in the characteristics of various films are corrected before actually taking a picture. Therefore, when the finished state is not as expected, for example, the exposure value or the flash light amount can be changed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a so-called lens shutter camera (hereinafter referred to as “LS camera”) in which a taking lens and a finder optical system are separated. Shooting lens 10
And a finder lens 11 are provided. 12 is a main switch and 13 is a release button. Shooting lens 10
Zooming is performed by operating the zoom button 14 or 15. The EVF 16 can be tilted arbitrarily and is composed of a liquid crystal plate or the like. The setting buttons 17 are used to set various modes described below. The information display liquid crystal plate 18 displays film sensitivity, a counter, exposure information and the like. Reference numeral 19 is a flash emitting section.

FIG. 2 shows a side view of the photographing optical system and the finder optical system. The finder lens 11 is a single focus lens, and the light that has passed through the finder lens 11 transmits image information to the EVF 16 through the diaphragm 20 and is an EVF CCD.
Guided to 21. The diaphragm 20 is for adjusting the exposure amount to the CCD 21. The taking lens 10 is composed of, for example, a two-group zoom lens as shown in the figure, and exposes the film 23. At this time, the diaphragm 22 moves together with the first group (represented by a convex lens) on the left side of FIG. In FIG. 2, each group is simplified and written with one lens, but it does not have to be one lens and may be formed with a plurality of lenses. This also applies to the finder lens 11.

FIG. 3 is a correlation diagram between the monitor range by the EVF 16 and the actual photographing range. In the figure, TT is the telephoto end shooting area, TW is the wide end shooting area, and EM is the EVF CCD monitor range. In this way, the finder lens 11 is configured so that the image information of the field angle larger than the maximum field angle of the taking lens 10 enters the EVF CCD 21.
This is the focal length of the shooting lens 10 finder lens
This can be done by making the focal length larger than 11. C
The CD 21 always captures information in a wider range than the shooting range, but the display by the EVF 16 may be performed by either of the following methods. 1. All the captured information of CCD21 is displayed, and the shooting lens
Area changes due to zooming of 10 are displayed in an area frame. 2. The area frame is fixed and displayed in accordance with the change in the angle of view of the zoom of the taking lens. In 1 the size (magnification) of the image does not change and only the frame changes, and in 2 the image capture range of the CCD 21
And the image size (magnification) changes accordingly.

As shown in FIG. 4, it is possible to switch the display methods 1 and 2 described above. (A)
Is a capture area of the CCD 21. (B) shows the area frame TA indicating the view angle range of the taking lens 10 in the display (a) by the above-mentioned method 1. (C) shows only the view angle range of the taking lens 10 by the above-described method 2, that is, only the area frame TA in (b). Display (b) and display (c)
Can be switchable automatically or manually. In the case of automatic switching, for example, when a release switch (not shown) is turned on by pressing the release button 13, the state is changed to (c), and the process returns to (b) after the end of exposure. By doing so, the photographer can confirm the actually photographed range on the enlarged display. When manually switching, the mode setting button 17 (FIG. 1) may be selected.

Since the CCD 21 captures an image of a region larger than the photographing region, parallax (parallax) at the time of proximity can be corrected. It is sufficient to shift the display area of the EVF 16. In FIG. 5, EM is the capture range of the EVF 16, FD is the EVF display range at a long distance, and ND is the EVF display range at a short distance. The area frame (ND) in which parallax is generated and displaced due to the AF distance information is displayed. At this time, the area frame is automatically shifted to the FD according to the subject distance information or the focal length information and the subject distance information, that is, the magnification information.

The case of displaying outside the visual field frame with the EVF will be described. FIG. 6 shows an EVF screen during normal shooting.
In this example, the composition includes a person standing on the beach and an object (wood) in front of the person to an object (sea, ship, cloud, bird, sun) in the back. In such a composition, for example, when performing panoramic shooting, the boundary and the outside of the shooting range can be clearly displayed by using the three display examples shown in FIG. 7, and the balance of the composition at the time of shooting can be easily confirmed. .. FIG. 7A shows an example in which the color tone is changed. Within the shooting range, the color tone of the subject is displayed as it is, and outside the range, it is displayed in one color such as red or green, or as a complementary color to the color of the subject, or in black and white only. Although (b) shows a specific pattern outside the photographing range, the pattern has such a density and roughness that it does not hinder the confirmation of an image outside the range. (C) is a negative / positive inversion of the display outside the shooting range, which can be in color or black and white.

FIG. 8 shows only the finder section of an LS camera in which the photographic lens and the finder lens are separate bodies, in which the variable magnification function is provided in the finder lens as another embodiment. FIG. 8 corresponds to FIG. 2, but the taking lens is not shown. If the zoom ratio of the taking lens is too large, the resolution is lowered and the EVF becomes difficult to see when the range of the small angle of view is taken out from the EVF information as shown in FIG. 4C.
At that time, if you zoom the viewfinder, you can maintain high resolution. At this time, the angle of view must be larger than that of the taking lens. In other words, the focal length of the taking lens> the focal length of the finder lens should always be maintained during zooming. FIG. 9 shows the variable power range of the finder lens and the variable power range of the taking lens. In this example, the zoom amount of the finder lens and the zoom amount of the taking lens are the same, but the zoom amount of the finder lens may be smaller than the zoom amount of the taking lens. When the zoom ratio of the finder section is reduced, the finder section becomes compact. When the change in the angle of view of the taking lens is θ (x), the angle of view θ ′ (x) of the finder unit in conjunction with the taking lens is θ ′ (x) = θ (x) + Δθ. However, Δθ is a constant value regardless of changes in the angle of view.

The control in the LS camera regardless of whether or not the viewfinder lens has a variable magnification function will be described below. FIG. 10 shows a flowchart of the main routine from when the power is turned on to when the exposure control is completed. When the power is turned on, the processing is started (step # 100), and the film data is loaded into the camera in step # 102 and the photographing lens data in step # 104. Subsequently, in step # 106, a routine for determining a composition described later is executed, in step # 108, an AF routine for focusing is executed, and in step # 110, an AE routine for determining an exposure value (aperture and shutter speed) is executed. In step # 112, the release switch is turned on.
If it is not turned on depending on whether it is done, step # 104 and subsequent steps are repeated. If it is turned on, the exposure control is started in step # 114, and the film is exposed. At step # 116, an EVF image data hold routine described later is executed at the same time as the exposure is started. In step # 118, new image data for EVF is fetched, and then step # 104 and subsequent steps are repeated. The AF routine in step # 108, the AE routine in step # 110, and the exposure control in step # 114 in the figure are the same as those in the known control method, and therefore description thereof will be omitted.

FIG. 11 is a flowchart of the film data input routine of step # 102 of FIG. The film data is obtained by reading the DX code on the surface of the cartridge. First, the ISO speed is read in step # 152, and then the latitude is read in step # 154. In step # 156, positive / negative is determined from the latitude data (positive film if the latitude is narrow, negative film if the latitude is wide). Step # 158 and Step # 160
Is the mode setting button 17 (Fig. 1)
Check the information set in. Step # 158 is
If the light source type is a daylight type or a tungsten type and it is not set, it becomes a daylight type. Step # 160 is color film if not set, whether the film is color or black and white. Then, in step # 162, the process returns to the main routine.

FIG. 12 is a flowchart of the taking lens data input routine of step # 104 of FIG. Step
The focal length information is read at # 202. For a zoom lens, enter the focal lengths at the tele and wide ends and the focal length at the current position. In step # 204, the aperture when the aperture is open, the aperture when the aperture is narrowed down, and the current aperture information are read. In step # 206, information on the closest distance and the current shooting distance is fetched. This shooting distance is input from an AF unit (not shown) and is not strictly lens data, but it is taken in by this routine. Return to the main routine in step # 208.

FIG. 13 is a flowchart of the composition routine of step # 106 of FIG. This routine is a routine for determining composition. First, in step # 252, EVF
The pixel data of the CCD for use is taken in for a certain period of time. Next, the setting of various modes is judged by looking at the mode setting button 17 (FIG. 1), and the routine for executing the mode is executed. Step # 2
If the line discrimination mode is set in 54, step # 256
In step # 258, the line discrimination routine is executed. If the pattern discrimination mode is set in step # 258, the pattern discrimination routine is executed in step # 260. Similarly, a moving body discrimination routine is executed in step # 264, and a confirmation routine is executed in step # 268. If the mode is not set, step
The pixel data captured in # 252 is transmitted to the EVF as it is, and normal display is performed in step # 270. CCD mentioned above
Switching between the capture screen, the area frame display, and the display only within the area frame (FIG. 4), the panorama display during panoramic shooting (FIG. 7), etc. are performed in the normal display of step # 270. Then, in step # 272, the process returns to the main routine.

FIG. 14 shows steps in the composition routine of FIG.
It is a flowchart of the line discrimination routine of # 256. Before explaining the actual flow, the state of line discrimination as an observation state of EVF will be described with reference to FIG. FIG. 15A shows a case where the camera body is held straight up with respect to the subject. At this time, the line of the subject is horizontal with respect to the EVF screen frame, and even when the image is transferred onto the film, the horizontal line is correctly horizontal with respect to the frame of the film. (B) is a case where the camera body is tilted with respect to the subject for some reason. If it is not clear whether this amount of inclination is large or small with respect to the EVF screen frame, it may be printed on the film as it is, and the amount of inclination is recognized only after development. In order to recognize the problem regarding the inclination before the actual shooting, a line is displayed in the EVF screen (c). By recognizing the pattern of the subject, the horizontal line of the subject is detected, and the reference line parallel to the screen frame of the EVF and the horizontal line of the subject are displayed simultaneously and at substantially the same position. As a result, the photographer can recognize the amount of tilt of the subject and can correct the tilt of the camera body. The detection line may be not only horizontal but also vertical and diagonal lines, and the diagonal line can be used to confirm the relative relationship with respect to horizontal or vertical. Further, the angle information with respect to the horizontal or the vertical calculated when the line of the subject is detected may be quantitatively displayed inside or outside the screen. Returning to FIG. 14, the actual flow will be described. In order to detect horizontal, vertical, or diagonal lines in the subject image information, the place where the spatial differential value of the luminance signal of the subject image information becomes large, that is, the place where the change in the luminance signal is large is detected and regarded as a line. Just do it. Step # 3
In 02, the luminance signals of adjacent pixels are compared. Since digital processing is performed in this routine, it is checked in step # 304 if the difference between adjacent luminance signals is larger than a predetermined value. If larger, the pixel is regarded as the line portion of the subject in step # 306. At step # 308, it is checked if the comparison of all pixels is completed. If not completed, the process returns to step # 302 to repeat the comparison between adjacent pixels. If all the pixels have been compared in step # 308, a straight line is created by connecting the pixels considered to be lines in step # 310, the longest one is selected from the obtained straight lines, and the straight line is the subject line. Part. Step
At # 312, it is checked whether the line part of the subject has been detected. If not detected, nothing is done, and at step # 322, the process returns to the calling source. If it can be detected, the relative angle with the reference line parallel to the EVF frame is calculated in step # 314. Step # 3
The line portion detected in 16 and the reference line are displayed in step # 318. At this time, the reference line is displayed near the detected line portion. The angle information is displayed in step # 320, and the process returns to the calling source in step # 322. It should be noted that the line portion of the subject may be detected by a color signal instead of the luminance signal.

FIG. 16 shows steps in the composition routine of FIG.
It is a flowchart of a pattern determination routine of # 260.
In step # 352, the size and position of the pattern are calculated by the pattern discrimination calculation, and the angle of view at a constant ratio including the pattern is set. As shown in FIG. 17, the subject is displayed at the set angle of view, but at this time, the shooting area is also displayed. In step # 354, it is determined whether or not the pattern extends beyond the photographing view angle (area frame). If it does, the view angle is automatically changed in step # 356. Figure 17
In (b), the area E1 is changed to E2. Step # 3
If the pattern angle displayed at 58 is dissatisfied and the automatically set angle of view is not satisfactory, the photographer performs desired zooming at step # 362, and then performs display again at step # 358. If the angle of view is satisfactory, return to the caller in step # 364. FIG. 17 is an EVF observation screen in which the angle of view is automatically set by the above-mentioned pattern discrimination. In (a), a pattern of a person is discriminated, and an angle of view in which an appropriate balance between the person and the background is maintained is displayed. (B) is a case where the person pattern moves from the position (a) toward the end of the EVF, and the area frame is automatically widened so that the person pattern falls within the shooting angle of view. In the case of a large number of persons, (c) determines the angle of view so that all the persons can enter. As a display method,
As shown in FIG. 17, there are a method of displaying the area frame in the screen and a method of displaying the area in the entire screen, which may be selected. The pattern discrimination when the subject is a moving body will be described later as a moving body discriminating routine, but in this moving body discriminating mode, the size cannot be discriminated when the subject is not a moving body, and therefore the optimum angle of view cannot be determined.
However, in this pattern determination mode, the size can be recognized even when the subject is not moving, and therefore the optimum angle of view for the subject can be determined.

There are various conventionally known methods for detecting a moving object on the screen. If the moving object can be detected, the size of the moving object can be calculated by pattern determination. By calculating the size of the moving object, the conventional APZ (Advanced Pr) which determines the angle of view so that the subject image magnification (focal length of the photographing lens / subject distance) becomes a predetermined value
It is possible to set the optimum angle of view with higher accuracy than ogram zooming. That is, in the conventional method, since the information about the subject is only the subject distance, for example, an adult and a child have the same angle of view at the same distance regardless of the size of the subject. If it can be recognized as a moving body, its size can be calculated, and by taking the size into consideration, it is possible to always shoot with an optimum angle of view. For the size of the moving body, for example, the area determined as the moving body is obtained,
It is calculated by pattern determination such as obtaining an area of the same color as the color information of the area determined to be a moving body. Further, instead of the method using the color distribution described above, the brightness distribution in the screen may be used. With the detection of a moving body, not only the size but also the amount of movement can be calculated. When the amount of movement can be calculated, the exposure can be controlled at an optimum shutter speed according to the amount of movement, and thus shooting without subject blurring is possible. In addition, it is difficult to shoot a moving object with the composition that the photographer assumed, but since the moving object is equipped with a means for automatically releasing by determining that the moving object has moved to a specific position on the screen, Shooting is easy. The predetermined position may be the center of the screen, but the position may be set according to the photographer's intention. In that case, it may be set by operating an operation member such as a dial from the outside.

FIG. 18 shows steps in the composition routine of FIG.
It is a flowchart of a moving body discrimination routine of # 264. In step # 402, the moving object is discriminated, and in step # 404, its size is obtained. In step # 406, the size of the moving body and the shooting angle of view are compared. If the angle of view is appropriate, the process proceeds to step # 410,
Otherwise, change the angle of view in step # 408 and step
Execute again after # 402. The angle of view is normally changed by zooming the taking lens, but there is also a method of performing trimming photographing. If it is determined in step # 406 that the angle of view is appropriate, the position of the moving body is detected in step # 410, and the amount of movement is detected in step # 412. Step
In # 414, the position and area of the moving body are displayed. If the automatically set view angle is not satisfactory, the photographer manually performs zooming in step # 418 to change the view angle. The changed angle of view is recognized as the moving object position area, the size is set in step # 420, and steps # 410 and thereafter are executed again. If the manual zooming is not necessary in step # 416, it is determined in step # 422 whether the automatic release mode is set. If not in automatic release mode, step
Return to the caller with # 430. In the automatic release mode, the main subject position preset in step # 424 is compared with the moving subject position. If there is no moving subject in the set main subject position, the process returns to step # 402 and the subsequent steps are executed again. When the moving object is at the set main subject position, set an appropriate shutter speed based on the amount of motion of the moving object detected in step # 426, and automatically release in step # 428,
Return to the caller in step # 430. FIG. 19 is an EVF observation screen in the moving body discrimination mode. When entering the moving object discriminating mode, a certain range E3 including moving objects is displayed on the EVF (Fig.
18 step # 414). The size of the E3 area is 10 moving objects.
It is automatically determined by the size with 0% entered and a certain margin ratio. At the same time, the shooting range of the actual shooting lens
E4 is also displayed on the EVF. E3 and E4 are areas of the same size. If the size of the area is good, it will be released when a moving object enters the area E4. In the figure,
(A) shows an EVF screen before composition is determined, and (b) shows an EVF screen immediately before release. There are two methods of release, one is that the photographer makes a decision and the other is that the moving body is judged to have entered the area and automatically released. The automatic release is 1. Determine the main moving direction of the moving object (long side direction OR short side direction). 2. Release when the moving body is centered on the side in the direction that matches the moving direction of the moving body. (However, the photographer performs the framing in the direction in which the image does not move.). If the main subject position is not the center of the side, the main subject position is set in advance. When the detected moving object area matches the set main subject position, the shutter is automatically released.

FIG. 20 shows steps in the composition routine of FIG.
It is a flowchart of the confirmation routine of # 268. What is confirmation mode? Before exposure control, shutter speed (Tv value),
Check the effect of the aperture (Av value) and check the appropriate Tv value and Av
This is a mode for selecting a value. In step # 452, the exposure value (Ev value) is input. The Ev value is determined by the brightness information obtained from the CCD and the film sensitivity. Step
In # 454, it is determined whether or not the mode is to see the effect of the shutter speed. If it is the mode for viewing the effect of the shutter speed, step # 456 and subsequent steps are executed, otherwise it is regarded as the mode for viewing the effect of the aperture, step # 462 and subsequent steps are executed, and the process returns to the calling source in step # 468. First, in the mode to see the effect of shutter speed,
In # 456, the shutter speed Tvp is calculated by the optimum program line for normal shooting according to the Ev value. In step # 458, the image controlled by Tvp is captured. At this time, the control of Tvp is controlled by the integration time of the CCD. Step
In # 460, the shooting information before and after α step is taken in from Tvp.
In this embodiment, a total of three pieces of information are taken in, one for each before and after Tvp, but any number of two or more may be taken for comparison with Tvp. Next, the mode for viewing the effect of the aperture is performed for the purpose of simulating the depth of field, the focus range, and the blur effect of the background. In step # 462, the aperture Avp is calculated by the optimum program line for normal shooting according to the Ev value. In step # 464, the aperture of the actual viewfinder is reduced to Avp and the CCD is used.
Capture the image data of. At step # 466, the shooting information before and after α steps from Avp is fetched. As with Tvp, as many as two or more sheets may be taken in. Tvp ± α, Av
Information acquisition of p ± α uses a method of actually changing the CCD integration time or the diaphragm to acquire an image.

FIG. 21 is a flow chart of the EVF image data hold routine of step # 116 of FIG. This is a routine for holding image data for display after release. When the release switch is turned on, the shutter is activated, and the exposure is started in step # 114 in FIG. 10, this routine is operated at the same time. First,
CCD integration is started in step # 502, and integration is completed in step # 504. The time from the start to the end of integration is 1/2 Tv when the control Tv value is Tv. Since the taking lens and the EVF optical system are separate, the proper exposure amount to the film and the proper exposure amount to the CCD are different. Therefore E
The VF optical system incorporates a diaphragm mechanism so that the exposure amount to the CCD is optimized. Next, in step # 506, after the exposure of the film is completed, the image information obtained by the CCD during the exposure is displayed on the EVF. Display time Δt is 1 ~
It is about 10 seconds. Finally, the image information obtained in step # 508 is stored in the RAM for data storage, and the shooting record data is saved.

Although the above description has been concerned with the LS camera and the EVF thereof, the single-lens reflex camera (hereinafter referred to as "SL
An embodiment applied to the "R camera" will be described below. Especially here, the EVF screen is divided,
Simulation under various conditions is possible. Figure
22 is a block diagram of an SLR camera equipped with an EVF. The CPU 30 for controlling each control unit includes an EVF control unit 31, an exposure control unit 33, a lens drive unit 37, a CCD 40, a lens information reading unit 41, an operation member control unit 42, a film information reading unit 44, and information about a film. The writing unit 45 is connected. The EVF control unit 31 drives and controls the EVF 32 composed of a liquid crystal element or the like. The exposure control unit 33
Three controls: an aperture control unit 34 that drives the aperture of the lens, a flash control unit 35 that controls an auxiliary light source such as a flash, and a shutter control unit 36 that controls a shutter that adjusts the exposure time of the field light to the film. The part controls the amount of exposure to the film. The lens drive unit 37 changes the shooting angle of view and drives the lens to the in-focus position by a zooming control unit 38 that performs zooming and a focus position control unit 39 that detects the focus position. The CCD 40 detects the field light. An image sensor other than the CCD may be used. The lens information reading unit 41 reads photographing lens information such as an F number. The operation member control unit 42 controls a switch group 43 including a focusing-related switch that inputs a focus position, an exposure-related switch that inputs an exposure amount, a shutter speed, an aperture, and a composition-related switch that inputs a shooting angle of view. The film information reading unit 44 reads the DX code, that is, the ISO speed and the latitude from the film cartridge. The information writing unit 45 for film writes the photographing information on the film.

FIG. 23 shows a flowchart of the main routine from the time the power is turned on to the time the exposure control is completed. When the power is turned on, the process is started (step # 550), and the film data is taken into the camera at step # 552 and the taking lens data at step # 554. This film data input routine is shown in Figure 11, and the shooting lens data input routine is shown in Figure 11.
The description is omitted because it is similar to that shown in FIG. Distance information of the field obtained from the CCD 40 in step # 556,
An Ev value calculation routine for calculating the exposure control brightness (Ev value) from the brightness information and the color information is executed. In step # 558, the image information obtained from the CCD 40 is displayed on the EVF 32 in full screen based on the calculated Ev value. In step # 560, it is determined from the calculated Ev value whether the flash is necessary or the photographer inputs a request to use the flash. If the flash is used for either reason, then in step # 562 a flash simulation routine is performed in which the photographer evaluates the flash effect. This is to see the effect of the flash based on the image information obtained by the CCD 40 at the time of pre-flash emission. In step # 564, it is determined whether exposure correction is necessary, and if it is necessary, the exposure correction simulation routine is executed in step # 566. This is to see the effect of the exposure correction by the image information obtained by the CCD 40 based on the corrected exposure value. Similarly, in step # 570, an appreciation simulation routine for evaluating the image information processed by the CPU 30 of the camera according to the characteristics of the recording medium is evaluated, and in step # 572, the difference in depiction due to the aperture and the shutter speed is actually measured. Is executed, and in step # 578, a special photographing routine for evaluating the special photographing between exposures by the image information obtained by driving the lens during the pre-exposure is executed. .. The AvTv routine is the same as the confirmation routine shown in FIG. In step # 580, it is checked whether or not the release switch is ON. If it is ON, known exposure control is performed in step # 582, and if it is OFF, nothing is done. After that, the process returns to step # 554 and the subsequent processes are repeated.

FIG. 24 is a flowchart of the Ev value calculation routine in step # 556 of FIG. CC in step # 602
Input image information from D40. In step # 604, it is determined whether the pattern discrimination mode has been selected. When the pattern discrimination mode is selected, it is checked in step # 606 if the image information includes a person pattern or a skin color area. If included, β (focal length of shooting lens /
Check if the subject distance) is less than the predetermined value β1. This is to judge whether the image magnification is intended for portrait photography. If β is β1 or less, it is not considered to be portrait photography, and in step # 610, the same weight is given to both the person and the background. Perform background-weighted metering. If β is larger than β 1 in step # 608, that is, if portrait photography is intended, β is set to a predetermined value β 2 (β1 <β in step # 612.
2) See if it's over. This is to determine whether the face can be clearly identified.If β is β2 or more, in step # 614 face-weighted metering in which the face of a person is weighted when shooting a person from full body to face-up Do. Step # 6
If β is smaller than β 2 in 12, in step # 616, person-weighted metering is performed by weighting the whole person when shooting a person from full-sized to half-body. If the person pattern or the like is not included in step # 606, it is checked in step # 618 whether there is a moving object in the image information. If there is a moving object, see if the photographer is following the shot in step # 620. If the follow shot is not being performed, weighted moving object weighted photometry is performed in step # 622.In the follow shot, the stationary object is regarded as a relative moving object. Perform weighted still object weighted metering. Also step # 618
If there is no moving object in step, average photometry is performed in step # 626. When the pattern determination mode is not selected in step # 604, the highlight shadow mode is set, and step # 628 and the subsequent steps are executed. Although the photographer sets whether to be the highlight reference or the shadow reference, the brightness of the highlight portion or the shadow portion is determined by the camera. That is, in Step # 628, C in the photometry based on the highlight standard or the shadow standard
The shutter speed of CD40, specifically, the shift amount of the integration time is calculated. In step # 630, several exposure amounts are evaluated in the multi-monitor mode described later, and one of them is selected. Check the image with the exposure amount selected in step # 632 on the EVF full screen. See if the image selected in step # 634 is satisfactory, and if so, proceed to step # 638. If dissatisfied, step # 638
Shift the exposure reference value with and return to step # 628 for re-evaluation. The evaluation may be performed not by changing the integration time (shutter speed) of the CCD 40 but by changing the aperture. Even after the above-mentioned various photometry, the process proceeds to step # 638, the Ev value is calculated, and it is written in the camera CPU 30 at step # 640.
Return to the main routine in step # 642.

FIG. 25 is a flow chart of the flash simulation routine of step # 562 of FIG. In step # 652, see if the photographer is set to check the state of the scene when the flash fires. If set, the flash controller 35 performs pre-flash in step # 654. In step # 656, the CCD 40 captures the image information, detects the change in the brightness of the field before and during the pre-emission,
The image information at that time is transmitted to the CPU 30. The CPU 30 predicts and calculates the shooting state at the time of the main flash based on the change in the brightness accompanying the flash flash of the field, and the image information thereof is EVF 32.
And display it in full screen in step # 658. Step
If the photographer does not confirm in # 652, the process returns to the main routine in step # 672. In step # 660, see if the photographer has set the flash light amount to the natural light amount ratio. If set, the shift amount of the light amount ratio input by the photographer is fetched in step # 662. At this time, the addition state of the flash light in each area of the scene is calculated from the change in the brightness of the scene detected in step # 656. The flash light reaches the short-distance subject, but does not reach the long-distance subject. Therefore, for example, if the flash light amount is increased,
This is because the short-distance subject becomes brighter accordingly, but the brightness of the long-distance subject does not change. When the light quantity ratio is shifted and the flash light quantity is increased or decreased as compared with the predetermined value, the change in the added state of the flash light in each area of the object field is calculated and the image information is transmitted to the EVF. .. In step # 664, several light intensity ratios are evaluated in the multi mode, and one of them is selected. In step # 666, the image of the light amount ratio selected in step # 664 is confirmed on the EVF full screen. Step # 6
Check whether the image selected in 68 is satisfactory, and if so, in step # 670, set the light intensity ratio to the CPU30.
Write in. If dissatisfied, the process returns to step # 662, the shift amount is changed, and the reevaluation is performed. When the light intensity ratio is determined,
If the photographer does not shift the light amount ratio in step # 660, the process returns to the main routine in step # 672.

FIG. 26 is a flowchart of the exposure correction simulation routine of step # 566 of FIG. In step # 702, image information is input from the CCD 40. Step
At # 704, the Ev value calculated by the Ev value calculation routine of FIG. 24 is input. In step # 706, the exposure correction amount input by the photographer is captured. In step # 708, several exposure compensation amounts are evaluated in the multi mode, and one of them is selected. In step # 710, the image of the exposure correction amount selected in step # 708 is confirmed on the EVF full screen. Step # 7
Check whether the image selected in step 12 is satisfactory, and if satisfied, set the exposure correction amount to CP in step # 714.
Write to U30 and return to the main routine in step # 716. If dissatisfied, the procedure returns to step # 706, the shift amount is changed, and re-evaluation is performed. This shift of the exposure correction amount is performed by actually photographing and changing the integration time to the CCD 40.

FIG. 27 is a flow chart of the viewing state simulation routine of step # 570 of FIG. In step # 752, image information is input from the CCD 40. Step
At # 754, the Ev value calculated by the Ev value calculation routine of FIG. 24 is input. In step # 756, the film data input routine (FIG. 11) is executed to input film information. Step
In # 758, it is checked whether the film is a black and white film based on the film information input in step # 756. For black and white film,
In step # 760, set the EVF32 in black and white monitor state (usually in color monitor state) and simulate the viewing state. In step # 762, display in full screen in black and white, then step
Return to the main routine with # 764. If it is not a black and white film in step # 758, then in step # 766 see if the light source is natural light. If it is natural light, EVF in step # 768
The 32 screen is set to the RGB characteristics of natural light, and if it is not natural light, the flash is emitted from the tungsten lamp, so in step # 770, the EVF32 screen is displayed with the tungsten light.
Set to GB characteristics. At step # 772, whether the film is a negative film is checked. If it is a negative film, at step # 774 the color monitor state of the negative film is set and the viewing state is simulated. At this time, when it is detected from the ISO sensitivity that the film is a high-sensitivity film, the EVF 32 is set to the rough reproduction mode. Display in full screen in step # 776.
In step # 778, the photographer determines whether or not the image is satisfactory, and if so, in step # 780 the print print density information of the image is recorded on a film, and then in step # 764
Then go back to the main routine. If dissatisfied, step # 782
Shift the baking density to the over or under side. In step # 784, several printing densities are evaluated in multi-mode, one of them is selected, and step # 774
Do the following. If the film is not a negative film in step # 772, it is regarded as a reversal film, and in step # 786, the EVF 32 is set to the ultrafine reproduction mode to simulate the viewing state. After displaying in full screen in step # 788, it returns to the main routine in step # 764. In this routine, depending on the film type, the EVF32 playback modes are normal mode (black and white / color), rough playback mode,
The three modes of ultra-fine reproduction mode are used properly,
The normal mode and the ultra-fine reproduction mode may not be distinguished from each other and may be one mode, or the rough reproduction mode may be two modes.

FIG. 28 is a flowchart of the special photographing routine of step # 578 of FIG. In step # 802, it is checked whether the photographer has set the zoom setting during exposure by the mode setting button. If so, step # 804 and the subsequent steps are executed. When the inter-exposure zooming is not set, it is checked in step # 816 whether the inter-exposure focusing is set by the mode setting button, and if it is set, step # 818 and the subsequent steps are executed. If neither is set, the process returns to the main routine in step # 814. First, zooming during exposure is performed. In step # 804, the lens is driven during pre-exposure to perform zooming. In step # 806, the image information at the time of pre-exposure is input, and in step # 808, it is displayed on the EVF 32 in full screen. In step # 810, the photographer looks at the display of the EVF 32 and inputs whether or not to perform the during-exposure zooming at the time of actual photographing. If it is decided not to do so, nothing is done and the process returns to the main routine in step # 814. Next, focusing during exposure is performed. In step # 818, the focus position is shifted during pre-exposure. Step # 8
In step 20, the image information during pre-exposure is input, and in step # 822, it is displayed on the EVF 32 in full screen. EVF in step # 824
Seeing the display of 32, the photographer inputs whether or not to perform the during-exposure focusing at the time of actual photographing, and if it does so, in step # 826 issues a command for the during-exposure focusing to the lens driving unit 37 and does not If so, do nothing and return to the main routine in step # 814.

FIG. 29 is a flow chart of the multi-monitor mode called from the above-mentioned various routines. What can be shifted are the flash light amount ratio, the exposure correction value, and the print burning density. Step # 8
At 52, the EVF controller 31 divides the screen of the EVF 32 into a plurality of parts. In step # 854, the initial control value is shifted by the shift value amount input by the photographer. Check if the value input in step # 856 is the light amount ratio when the flash is fired. If it is the light amount ratio, in step # 858, the brightness level in EVF32 of the area illuminated by the flash during pre-flash is shifted to C
It is stored in PU30. If it is not the flash light, it is the printing density or the exposure correction value, and therefore, the information on the changed aperture is stored in the CPU 30 in step # 860. In this routine,
Although the aperture is changed, the shutter speed may be changed instead of the aperture. Step # 858 or Step # 8
EVF obtained by dividing the information stored in 60 in step # 850
Display on each screen of 32 (step # 862). Step # 864
Then, it is checked whether a zoom-up request for an arbitrary area of each split screen is input, and if not, the process proceeds to step # 874. When it is input, see whether or not to specify the area to be zoomed in in step # 866. If specified, specify the area in step # 868, and zoom in the area specified in step # 870. .. When the area is not specified, the central area (for example, an area of about 1/4 of the split screen) is automatically zoomed up in step # 872. In step # 868, as a method for specifying the area, two points at both ends of one diagonal line of the area to be enlarged on the divided screen are designated by the cursor on the screen.
The cursor is moved or designated by using an operation member such as a dial provided on the camera or by detecting the line of sight. In step # 874, the photographer evaluates each screen, and if there is no screen that satisfies the effect, see if you input the shift amount to change the shift amount again.
Return to # 854 and execute # 854 and later again. If you are satisfied with the screen, select it in step # 876. The screen is selected by a method such as dial detection or line-of-sight detection, as in step # 868. The control value of the selected screen is set as the determined value. When a plurality of screens are selected in step # 876, the average of the control values of the selected screens is set as the determined value. Step
Switch EVF32 from split screen to standard screen with # 878,
Return to the caller in step # 880.

FIG. 30 shows a display screen in the above-mentioned multi-monitor mode. The screen is divided into four parts, and each screen displays an image with a control value obtained by shifting the initial control value by a predetermined value. FIG. 31 shows a display screen in the multi-mode like FIG. 30, but the screen is divided into three parts and the layout of the screen is also different from that in FIG. FIG. 32 is the same screen as FIG. 30, but the evaluation area is enlarged and displayed for each divided screen. In FIG. 33, the area EC to be enlarged is specified by the area specifying cursor CU on the screen of FIG.

FIG. 34 shows an example of a multi-monitor screen (divided into two) in the flash simulation shown in FIG.
Since the flash light acts only on a short-distance subject, the brightness of the background does not change, and only the brightness of a short-distance person increases. For example, it is possible to confirm on the screen that a person becomes dark by shooting a flash although the person becomes dark as in the screen on the left when shooting with backlight. Figure 35 shows the exposure compensation simulation or diagram of Figure 26.
27 shows an example of a multi-monitor screen (divided into two) when print printing density is selected in the viewing state simulation in 27. In both of these simulations, the screen becomes brighter or darker while maintaining the ratio of the lightness and darkness of the screen unlike when the flash is emitted. In the exposure correction simulation, the Av value and the Tv value are shifted, and the exposure value is changed and monitored. In determining the printing density, the film latitude equivalent width is shifted and monitored. Also, more specifically,
36 is two screens with different photographic lens apertures, and the background on the right screen is blurred compared to the screen on the left. Figure 37 shows two screens with different shutter speeds.

As an application example of the EVF to the SLR camera,
An SLR camera capable of switching between an optical viewfinder and an electronic viewfinder (EVF) will be described below.

First, the switching mechanism will be described. Figure 38
Is an example using a hollow penta. In the figure, the upper part is the viewfinder side and the lower part is the taking lens (film) side. A shutter 51 and a film 52 are installed in a position where the light entering the taking lens 50 goes straight. When observing as an optical viewfinder, the light passing through the taking lens 50 is reflected by the main mirror 53 toward the finder side and forms an image on the focusing screen 54. The image is a hollow penta55, pentareflector
Observe through 56 and eyepieces 57, 58. On the other hand, the light partially passing through the main mirror 53 is reflected by the sub mirror 59,
It is guided to the CCD 61 through the relay lens 60 and an image is taken. The exposure of the film 52 is performed by raising the main mirror 53 in the arrow direction and opening the shutter 51. At this time, the sub-mirror 59 may be raised, or if a semi-transmissive mirror such as a pellicle mirror is used for the sub-mirror 59, the sub-mirror 59 does not need to be moved (up), and imaging can be performed during exposure. To switch from the state of FIG. 38 to the EVF, first, as shown in FIG. 39, the pentareflecting mirror 56 arranged in the optical path of the finder is rotated in the direction of the arrow (FIG. 38), and the upper front of the hollow penta 55. The display element 62 and the illumination member 63 arranged in the section are moved into the finder optical path. Next, the main mirror 53 is raised to block light from the photographing lens side. In this state, if the eyepieces 57 and 58 are moved to change the magnification of the image and adjust the diopter, the image captured by the CCD 61 and displayed on the display element 62 can be observed. By such operation,
The optical viewfinder and EVF can be switched and used with the configuration of the optical system finder unchanged.

FIG. 40 shows an EVF using a pentaprism.
In this embodiment, the display element for the display is arranged near the roof surface of the pentaprism outside the optical path of the finder. When observing as an optical viewfinder, it is almost the same as FIG. 38 except that the penta prism 64 is used. Reflecting mirrors 65, 66, a lens 67 and a spectral prism 68 are arranged in front of the eyepieces 57, 58 for switching to the EVF.
When switching from the state shown in Fig. 40 to EVF,
As shown in FIG. 41, the main mirror 53 is raised to block the light from the taking lens 50 side, and the image taken by the CCD 61 is displayed on the display element 62 of the penta roof. At least one reflection mirror (two in this embodiment) and lens 67
Then, the light is guided to the eyepieces 57 and 58 using the spectral prism 68. At this time, the eyepieces 57 and 58 are moved in the same manner as in FIG. 39 to adjust the diopter.

FIG. 42 shows an embodiment in which a pentaprism is used as in FIG. 40, but a transmissive display element is used as a display element for EVF. When used as an optical viewfinder, the illumination member 63 is retracted from the optical path of the viewfinder, the light from the taking lens 50 is reflected by the main mirror 53, and the focusing screen 54, transmissive display element 69, and pentaprism 64 are used. And through the eyepieces 57, 58. Exposure and imaging are performed in the same manner as in FIG. 38 described above. EVF
To switch to, take the main mirror 53 up and
The light from the 50 side is blocked, and the illumination member 63 is inserted between the focusing screen 54 and the transmissive display element 69 to perform backlight illumination, thereby displaying the image of the transmissive display element 69.

Such an optical viewfinder and E
The control in the SLR camera capable of switching the VF will be described below. FIG. 44 shows a flowchart of the main routine from the power-on to the display after the exposure control is completed. When the power is turned on, the process is started (step # 900), and the film data is saved in step # 902.
At # 904, take lens data into the camera. The film data input routine is the same as that in FIG. 11 and the taking lens data input routine is the same as that in FIG. 12, so description thereof will be omitted. Then, in step # 906, the brightness data Bv of the subject is sent from the photometric system.
Take 0. At step # 908, it is determined whether the EVF mode is set. If the EVF mode is set, the process proceeds to step # 916. EV
If it is not the F mode, it is checked in step # 910 if the brightness Bv0 is smaller than the predetermined value K.
Warns that the EVF display is desirable. If the EVF automatic switching mode is set in step # 914, the process proceeds to step # 916. Step
Whether the brightness Bv0 is equal to or higher than the predetermined value K in # 910, or step # 9
When it is not in the automatic switching mode in step 14, step # 922
Check if the simulation mode is set with, and if it is set, proceed to step # 916. If not, display the optical viewfinder display in step # 924 and proceed to step # 926. .. Step # 916
Then, in order to display the EVF, the operation such as the movement of the main mirror described above is performed to display the EVF. At step # 918, it is checked whether the simulation mode is set. If the simulation mode is set, the EVF simulation routine described later is executed at step # 920. If not in simulation mode, proceed to step # 926. At step # 926, it is checked whether or not the release switch is ON. If it is not ON, the process returns to step # 904, and if it is ON, the well-known exposure control is performed at step # 928. At step # 930, see if it is the confirmation mode. If it is not the confirmation mode, return to step # 904,
If it is the confirmation mode, the information on the exposure control is taken in at step # 932, the exposure state is displayed, and the process returns to step # 904.

The EVF simulation routine of step # 920 of FIG. 44 is similar to the confirmation routine of FIG.
The effect is seen by changing the shutter speed or aperture. The result is displayed by dividing the screen as shown in FIGS. 30 and 31. As shown in the figure, when each screen is small and difficult to see in the plane division, time-division display may be performed in which several screens are displayed at regular intervals.

FIG. 45 shows an optical viewfinder and EV.
FIG. 22 is a block diagram of an SLR camera capable of switching F, and corresponds to FIG. 22 described above. Instead of the EVF control unit 31, a finder control unit 46 for controlling and switching both the EVF and the optical viewfinder is provided, and instead of the EVF 32, a finder 47 is provided. Further, an EVF changeover switch and a simulation switch are added to the switch group 43.

[0040]

As described above, according to the present invention,
If you input the difference depending on the filming medium, such as black and white, color, and high-sensitivity film, the image information captured by the EVF will be corrected in consideration of the characteristics, and the EVF monitor screen will be displayed. To display. This allows the photographer to check the finished state of the photograph on the EVF monitor screen according to the characteristics of the film. If you look at the screen and do not like the finished state, you can change the conditions again, monitor it, and shoot it after you like it, so there are fewer shooting failures.

[Brief description of drawings]

FIG. 1 is an external view of an LS camera.

FIG. 2 is a side view of a photographing optical system and a finder optical system.

FIG. 3 is a correlation diagram of a monitor range and an actual photographing range by EVF.

FIG. 4 is a diagram showing captured image information of a CCD and a photographing area frame.

FIG. 5 is a diagram showing parallax correction.

FIG. 6 is a diagram showing a normal EVF screen.

FIG. 7 is a diagram showing an EVF screen during panoramic photography.

FIG. 8 is a side view of a finder unit having a zoom function.

FIG. 9 is a diagram showing a variable power range of a finder lens and a taking lens.

FIG. 10 is a diagram showing a flowchart of a main routine of control of the LS camera.

FIG. 11 is a diagram showing a flowchart of a film data input routine.

FIG. 12 is a view showing a flowchart of a photographing lens data input routine.

FIG. 13 is a diagram showing a flowchart of a composition routine.

FIG. 14 is a diagram showing a flowchart of a line determination routine.

FIG. 15 is a diagram showing a state of line determination.

FIG. 16 is a diagram showing a flowchart of a pattern determination routine.

FIG. 17 is a diagram showing a state of pattern determination.

FIG. 18 is a view showing a flowchart of a moving body discrimination routine.

FIG. 19 is a diagram showing a state of moving body discrimination.

FIG. 20 is a diagram showing a flowchart of a confirmation routine.

FIG. 21 is a diagram showing a flowchart of an image data hold routine.

FIG. 22 is a block diagram of an SLR camera including an EVF.

FIG. 23 is a diagram showing a flowchart of a main routine of control of an SLR camera.

FIG. 24 is a diagram showing a flowchart of an Ev value calculation routine.

FIG. 25 is a diagram showing a flowchart of a flash simulation routine.

FIG. 26 is a diagram showing a flowchart of an exposure correction simulation routine.

FIG. 27 is a diagram showing a flowchart of a viewing state simulation routine.

FIG. 28 is a diagram showing a flowchart of a special photographing routine.

FIG. 29 is a diagram showing a flowchart of a multi-monitor mode.

FIG. 30 is a diagram showing a display screen in multi-monitor mode.

FIG. 31 is a diagram showing a three-division display screen.

FIG. 32 is a diagram showing an enlarged split screen.

FIG. 33 is a diagram showing area designation by a cursor.

FIG. 34 is a diagram showing a multi-monitor screen in a flash simulation.

FIG. 35 is a diagram showing a multi-monitor screen in an exposure correction simulation.

FIG. 36 is a diagram showing a multi-monitor screen in which the aperture is changed.

FIG. 37 is a diagram showing a multi-monitor screen in which the shutter speed is changed.

FIG. 38 is a view showing a viewfinder switching mechanism using a hollow penta.

FIG. 39 is a view showing a finder switching mechanism using a hollow penta.

FIG. 40 is a diagram showing a viewfinder switching mechanism using a pentaprism.

FIG. 41 is a view showing a viewfinder switching mechanism using a pentaprism.

FIG. 42 is a view showing a viewfinder switching mechanism using a transmissive display element.

FIG. 43 is a diagram showing a viewfinder switching mechanism using a transmissive display element.

FIG. 44 is a view showing a flowchart of finder switching control.

FIG. 45 is a block diagram of a viewfinder switchable SLR camera.

[Explanation of symbols]

 10 Shooting lens 11 Finder lens 16 EVF 21 CCD 30 CPU 31 EVF control unit 33 Exposure control unit 37 Lens drive unit 40 CCD 41 Lens information reading unit 42 Operation member control unit 44 Film information reading unit 45 Film information writing unit 46 Finder Control unit 50 Shooting lens 53 Main mirror 54 Focus plate 55 Hollow penta 56 Penta reflecting mirror 59 Sub mirror 61 CCD 62 Display element 64 Penta prism 65 Reflecting mirror 66 Reflecting mirror 67 Lens 68 Spectral prism 69 Transmissive displaying element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeto Omori 2-3-13 Azuchi-cho, Chuo-ku, Osaka Osaka International Building Minolta Camera Co., Ltd. (72) Atsushi Ishihara 2-chome, Azuchi-cho, Chuo-ku, Osaka 3-13 No. 13 Osaka International Building Minolta Camera Co., Ltd.

Claims (5)

[Claims] 1. A camera having an electronic viewfinder, comprising a means for correcting and displaying a monitor screen of the electronic viewfinder according to the characteristics of a film to be used. 2. The camera according to claim 1, further comprising means for inputting the film characteristic. 3. The camera according to claim 1, wherein when the film characteristic is black and white film, the monitor screen of the electronic viewfinder is set to black and white mode. 4. The camera according to claim 1, wherein the RGB characteristic of the monitor screen of the electronic viewfinder is corrected when the film characteristic is a film having a spectral sensitivity characteristic. 5. The camera according to claim 1, wherein when the film characteristic is a high-sensitivity film, the monitor screen of the electronic viewfinder is set to the rough reproduction mode.