JPS60178779A - Electronic image-pickup device - Google Patents

Abstract

PURPOSE:To enable evaluation of the propriety of the exposure quantity in a picture part and the desired area by binarizing a video signal, setting it to a binarization video signal before it is supplied to an electronic finder and setting the specific part of a said video signal to photometry information by an area set ting means. CONSTITUTION:A video signal outputted from a video circuit 37 is added to a binarization circuit 40 consisting of comparators 41 and 42, which convert a picture signal into a binarization signal by a means of a slightly lower level than a saturated level of a video signal and a slightly higher level threshold than a black level. Said signal is converted into a binarization video signal S5 by a video circuit 80. A video signal synthesizing circuit 50 supplies only a signal S5 as well as various signals to a display device 10 by selection of a display changeover switch 27. In terms of area setting circuit 70, when some area is selected by an area pattern selecting circuit 71, an area specifying signal is given to a gate circuit 73 from a picture quality check area specifying signal generator circuit 72, and during that time, a binary signal S4 is supplied to the video circuit 80 through a picture logical circuit 74. Thus said area 76 becomes effective as photometry information for deciding picture quality.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electronic imaging device (hereinafter referred to as an electronic camera), and particularly relates to an improvement in an exposure evaluation means. [Prior Art] Generally used in electronic cameras. The exposure evaluation means used is an average metering method that evaluates the average exposure of an entire screen to be imaged.Therefore, although it is possible to evaluate the average exposure of the entire screen, It was not possible to evaluate the exposure m in a portion.However, in an actual surface image, even if the exposure amount for the entire screen is appropriate, it is relatively common for individual portions to be inappropriately exposed. Therefore, if the exposure value is determined using an average metering evaluation method, poor image quality will occur on the captured screen due to overexposure or underexposure.Especially if these poor image quality areas are important parts of the subject. This is a serious problem.As described above, the exposure evaluation means using the average metering method has the disadvantage that it is not possible to perform two-dimensional evaluation of exposure based on the clear part of the imaged screen.

In the case of an electronic camera equipped with an electronic viewfinder, it is possible to evaluate two-dimensional image quality by covering the video signal output from the image carrier device with the electronic viewfinder. However, since only overexposed areas and underexposed areas are not clearly specified and displayed, there is a problem in that it takes time and effort to confirm them.

[Purpose] An object of the present invention is to be able to quickly and accurately evaluate the suitability of exposure for each part of the screen to be imaged, and to set the area to be evaluated to a desired area on the screen. We provide an electronic camera that can be identified.

(Summary) In order to achieve the above object, the present invention is characterized by having the following structure.That is, an optical image incident through an image carrier lens of an electronic camera is photoelectrically converted into a video signal by an imaging device, and this is converted into a video signal. is added to a binarization circuit consisting of, for example, two comparators.This binarization circuit has a threshold level that is slightly lower than the saturation level of the video signal and a value that is slightly higher than the black level. The signal is converted into a binarized signal.The binarized signal thus obtained is converted into a binarized video signal by the imaging circuit and is supplied to the electronic viewfinder.Then, for example, the area pattern selection circuit and the image quality The present invention is characterized in that a specific portion of the binarized video signal is made effective as a photometry 1 information by a region setting means comprising a check region 1 designation signal generation circuit and a go 1 circuit.

(Embodiment) FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention. The light image from the subject 1 is captured by the imaging lens 2, the lens 3,
Half mirror 4, shutter 5, surface image device 6
The light enters the light-receiving surface and forms an image.

A part of the optical image of the subject is formed on a focusing glass 7 by a half mirror 4. The optical image formed on the bottle 1-glass 7 is visible through a pentaprism 8 and an eyepiece 9. 1ffi for display device 10
An electronic image is displayed as shown in the figure, and this electronic image is projected by a half mirror 11 onto the optical axis connecting the focusing glass 7 and the pentaprism 8. Therefore, the above electronic image is also the same as the Ventaprism 8.
．． It is visible through the eyepiece 9. Note that the display device 10 is constituted by a scanning type two-dimensional solid state display element such as a liquid crystal or a light emitting diodes.

2 and 3 are a front view and a side view showing the structure of the shutter 5. FIG.

As shown in FIGS. 2 and 3, the shutter 5 is a rotary shutter whose shutter speed is variable by controlling the phase of two slit circles 112 and 13. That is, the two discs 12 and 13 are connected to two servo motors 14, which are placed opposite each other so that their rotation centers are coaxial.
Each of the 15 axes has a corresponding one. One disk 12 is provided with three sulins A, B, and C divided at 90 degrees. The other disc 13 has two slits a.

b is divided into 180 degrees. Said disk 12.1
When the imaging device 6 is driven at a field frequency of 60 Hz, the rotation servo is performed at 1800 PPM.

Therefore, shutter exposure can be performed on the VA image device 6 every 1/60 sec.

On the other hand, the servo motors 14 and 15 are subjected to phase servo so that the slit positions are at a constant interval. By controlling the phase shift of the phase servo using a shutter control signal based on photometric information described later, the slit widths W1 and W2 are changed, and the shutter speed can be continuously and steplessly adjusted. ing.

When a3 slits A and a overlap, slits B and b also overlap, making it possible to perform exposure every 1./60 seconds. Therefore, it is suitable for field recording mode 1 in an electronic camera.

If the phases of the disks 12 and 13 are shifted approximately 90 degrees clockwise in the illustrated positional force scale in FIG. 2, Surins 1 to C and Surins ta overlap. At this time, the slits Δ, B of the disk 12
overlaps with the light-shielding portion of the disc 13, so only Surin I-C moves effectively. Therefore, in this case, exposure every 1/30 second is possible. Therefore, it is suitable for the frame recording mode of the D5 electronic camera.

Let's return to Figure 1. A main control circuit 20 shown at the bottom of the figure controls the entire apparatus. This main control circuit 20 is an automatic/manual select switch 212 and an image confirmation switch 22.
．． Record switch 23. Playback switch 24. Aperture 1m setting device 25. Shutter speed setting device 269 display changeover switch 2
71 display brightness adjuster 28 and the like.

Thus, when the main control circuit 20 (or automatic/manual select switch 21 is set to the automatic side), normal program automatic exposure recording control is performed. Each time the recording switch 23 is pressed, the diaphragm control circuit 31.shutter speed control circuit 32.imaging device drive cycle 33.recording switch circuit 34 , outputs a control signal to the recording/reproducing circuit 35 to record an image.In this case, as described above, the optical image captured by the imaging device 6 is converted into an electrical signal, amplified by the preamplifier 36, and then A predetermined video signal is generated in the imaging circuit 37, and the normally closed side 38b of the changeover switch 38,
Record switch 34. Recording/reproduction and images are recorded in the memory built into the main control circuit 20.

In addition, the main control circuit 20 is an automatic/manual select switch 21
When switched to the manual side, the set values of the aperture value setter 25 and shutter speed setter 26 are read, the aperture control circuit 31 and the shutter speed control circuit 32 are activated, and each time the record switch 23 is pressed, the aperture value is changed. Aperture value of 3 and shutter 5
Recording is performed in the same way as described above by controlling the shutter speed.

On the other hand, in the case where a TV program is created by not playing back images captured by a TV camera, but by discarding screens with many defective signals and joining together only the screens with few defective signals, pressing the playback switch 24 allows recording and playback. The circuit 35 and the three playback switch circuits are activated, and the video signal recorded in the memory is read out. This read out reproduced image @ signal is transmitted via a changeover switch 38 which is switched to the normally open side 38a by a control signal from the main control port 2g20, instead of the raw signal from the imaging circuit 37, which will be described later. The signal is supplied to a binarization circuit, etc.

When evaluating image quality without recording images,
All you have to do is press the image confirmation switch 22. That is, each time the switch 22 is pressed once, the image taken is evaluated as follows. For simplicity, automatic/hand sweetfish selection 1
A case will be described in which the switch 21 is set to the manual side (d3) and the changeover switch 38 is switched to the normally closed side. When the image confirmation switch 22 is pressed, an optical image formed on the imaging device 6 under the conditions of the aperture and shutter speed based on the manually set values is transferred to the imaging device drive circuit 3.
3, the signal is read out once as an electrical signal, amplified by the preamplifier 36, and then converted into a predetermined video signal by the imaging circuit 37. Here, for the sake of simplicity, it will be explained as an NTSC standard composite video signal. This composite video signal is sent to the first terminal of the binarization circuit 40 via the normally closed side 38b of the changeover switch 38.
The signal is output to the comparator 41 and the second comparator 42, the video signal synthesis circuit 50, and the average photometry circuit 30. The composite video signal S1 applied to the first comparator 41 is based on a white level set value VS which is set slightly lower than the saturation level v1 of the video signal, and the portion exceeding this is set to a logic level 11fi.
r I J , and the portion not exceeding r I J is converted into a binary signal with a logical value rOJ. Similarly, the composite video signal S1 applied to the second comparator 42 is based on a black level set value VD set slightly higher than the black level V2 of the video signal.
The part below this is converted into a binary signal with a logic value of 1a r 1 J, and the part which is not below this is a logic value rOJ.

These binary signals are then applied to one input terminal of each of AND gates 43 and 44. And gate 43 above.
A synchronizing signal from a synchronizing signal generating circuit 60 is applied to the other input terminal of each of the synchronizing signal generating circuits 44 . Thus, each binarized signal has its blanking period portion removed.

The binarized signal 82, S from which this blanking period portion has been removed
3 becomes an OR output of the above-mentioned signals S2 and S3 at an OR gate 45, and becomes a 21-digit image quality poor signal S4.

FIG. 4 is a waveform diagram showing the binarization described above.

As shown in FIG. 4, in one horizontal scanning period H of the composite video signal @S1, the portion exceeding ■S becomes a logical value "1",
Moreover, the blanking period portion is removed, resulting in a binary signal S2. Further, the portion below VD also has a logic value of "1", and the blanking period portion is removed, resulting in a binary signal S3.

The binary image quality defective signal S4 is the OR output of the signals $2 and 83. Note that 85 in FIG. 4 indicates that the binary image quality defect signal S4 obtained as described above is supplied to the imaging circuit 80 via the area setting circuit 70 shown in FIG. This is a signal obtained by adding a synchronizing signal from the synchronizing signal optical main circuit 60 after the gain is adjusted to the synchronizing signal light main circuit 60, and is a binary video signal for identifying areas with poor image quality.

FIGS. 5(a) and 5(b) are examples of one screen of the binary video signal S5 obtained in this manner. This example is about a subject P1, a person standing next to a window with the setting sun behind him, as shown in Figure (a), and when the image confirmation switch 22 is pressed, Poor image quality part P2
It is shown that a binarized electronic image P3 clearly showing the above can be obtained. That is, the part of the person's face that is backlit is an underexposed part, and the part of the sunset is an overexposed part, and these parts form a poor image quality part P2.

Here, the explanation returns to FIG. 1 again. The binarized video signal S5 obtained by the imaging circuit 80 is sent to the video signal synthesis circuit 5.
0. Depending on the selection of the display changeover switch 27, the video signal synthesis circuit 50 either supplies only the binarized video signal S5 to the display device 10, or performs the binarization process on the output of the aforementioned imaging circuit 37. Either only the previous video signal is supplied to the display device 10, or furthermore, the binarized video signal 85 is superimposed on the video signal before the binarization process in an analog manner to create a composite image signal, and this is sent to the display device 10. supply to. Note that a display brightness adjustment circuit 51 is inserted between the video signal synthesis port 2a 50 and the display 1 vice 10, and the brightness of the display device 10 can be adjusted according to instructions from the display brightness adjuster 28. There is. Moreover, if the display device 10 is turned off as necessary,
You can only see the image through the optical viewfinder.

By the way, the area setting circuit 70 is configured to set a predetermined area pattern, for example, in FIGS. 6(a) and 7(a) to (CI).
an area pattern selection circuit 71 that selects a pattern as shown in FIG. and a gate circuit 73 that passes the binarized signal in response to a designated signal from a circuit 72.

As shown in FIG. 6(a), the area pattern selection circuit 71
When a pattern in which the area 76 at the center of the screen 75 is selected as the image quality check area is selected, the image quality check area designation signal @ generation circuit 72 outputs a horizontal line H1 to the video signal S1 as shown in FIG. 6(b). , H7, the signal rOJ
, a signal "1" of width T is sent out on the horizontal lines H2 to H6, and this is applied to one input terminal of the gate circuit (AND) 73. The other input terminal of the gate circuit 73 is supplied with the output signal of the binarization circuit 40, that is, the binarized signal S4. Therefore, the binary signal S4 is applied to the gate circuit 73 only during the period when the gate circuit 73 is given the designation signal from the image quality check area designation signal generation circuit 72.
Pass 3. This passing signal is supplied to the aforementioned imaging circuit 80 via the image logic circuit 74. Therefore, the aforementioned specific area 76 of the binary video signal becomes effective as photometric information for image quality determination. The selected area patterns include an extremely small rectangular area at the center of the screen as shown in Figure 7(a), a rectangular area at the bottom of the screen as shown in Figure 7(b), and a rectangular area at the center of the screen as shown in Figure 7(C). Various options can be selected, such as a circular area, a triangular area at the center of the screen as shown in FIG.

By performing the binarization image processing and area setting processing as described above, the user can check the image, press the switch 22, and view the image quality information in the desired area on the electronic viewfinder as a two-dimensional image. This makes it possible to quickly and accurately judge the shooting conditions. By performing such two-dimensional image quality evaluation, it becomes possible to deal with special imaging conditions that cannot be handled by the above-mentioned average photometry circuit or the like. In particular, since the latitude of video systems is narrower than that of film systems, such two-dimensional image quality evaluation is effective.

Next, an example will be described in which the two-dimensional image quality evaluation method using the image signal processing system described above is further developed and automated. In other words, it is a means of adding operability comparable to that of a current shutter speed-priority or aperture-priority fully automatic exposure--a second-eye camera. The aperture value setter 25 is set to [Auto J rFl, 4J rF
2J...rF16J can be set, and the shutter speed setting device 26 can be set to [Auto Jr1/60j].
It is possible to make settings such as r/125J...N/100OJ. If the aperture value setter 25 is set to "auto" and the shutter speed setter 26 is set to a value other than "auto", the mode becomes shutter speed priority mode; conversely, if the shutter speed setter 26 is set to "auto", the aperture If the value setter 25 is set to a value other than "O!lJj", the aperture priority mode is set.

When the image confirmation switch 22 is set to the continuous side, the shutter speed will automatically change continuously in the aperture priority mode, and conversely, the aperture value will automatically change continuously in the shutter speed priority mode. A video signal corresponding to the change step is sent to the binarization circuit 40. Binarization circuit 4
The output of 0, that is, the poor image quality signal S4 is the area setting circuit 70.
The image is sampled and divided into pixels in a pixel logic circuit 74 provided at the output end of the pixel, and then subjected to logic processing. As for this logical processing, for example, pixels are divided into 2×2 or 3
×3, etc., to form a noise killer circuit that ignores only one or two defective pixels among them, and processes such as disabling image quality defects in minute areas (such as disabling g).The above logic is performed. The defective pixels remaining as a result of the processing are regarded as abnormal pixels, and the extent of the defective pixels is measured by the abnormal pixel integration circuit (or abnormal pixel counter) 91. The processing is performed, and the results are evaluated by the minimum 1a detection circuit 92 to determine the exposure conditions that minimize the number of abnormal pixels. Speed and aperture value are output.

Fig. 8 specifically shows the above contents, and shows two cases A with different subjects and surrounding conditions at the time of shooting.

This is an example of evaluation of B using the shutter speed priority method. In case △, when the shutter speed is 1/250 seconds, the aperture is 4.
This is the best condition. In case B, the shutter speed is 1/25
When it is 0 seconds, the best conditions cannot be obtained, and the shutter speed is 1/6
The best conditions are when the aperture is set to 0 seconds and the aperture is set to 3.5. In this example, shutter speed is given priority, but aperture priority may be given, or a simplified version with some programming may be used. Since the above-mentioned automated image quality evaluation processing can be electrically performed almost in real time, if the system is operated in a mode compatible with the NTSC standard television system, it is possible to check 60 conditions every second. If the aperture or shutter is mechanical, the operating speed will be limited and the number of processing conditions per second will be reduced, but it will be possible to use physical shutters, physical apertures, etc. that do not have mechanically moving parts. For example, 60 conditions can be checked every second.

As described above, the present embodiment does not have the drawbacks of the conventional video image conveyance system, and as described below, it is possible to achieve multiple image capture functions, which was not possible with the film system C.

(1) Image quality can be determined as a two-dimensional image without the ambiguity of images associated with conventional average photometry methods.

(2) Image quality display can be performed with a 1:1 correspondence with the actual image.

(3) Automation is designed to satisfy the above (1)<2).

(4) In addition to the first output during recording, the image quality of images that have already been recorded is also evaluated.

(5) A 1:1 correspondence between the optical image and the electron beam! 19.

6) The causes of image quality deterioration that are unclear due to conventional recording FM recording systems, modulation systems, etc. can be thoroughly checked before recording, and the occurrence of color distortion can be prevented.

(7) It is also possible to selectively use either the optical finder or the electronic finder.

Next, a second embodiment of the present invention will be described in which the photometry accuracy is further improved. In FIG. 1 mentioned above, the binarization levels VS and VD are shared as a circuit for imaging and reproduction. In Figure 1, V
Since S and VD can be set at appropriate levels for evaluating playback image quality, the concept shown in FIG. 1 may be used for evaluating playback image quality.

However, during image transfer or recording, the circuit shown in FIG. 1 does not have very good accuracy. The reason for this is that the imaging circuit 37 in FIG. 1 includes a gamma correction circuit, a knee circuit, a clip circuit, etc. that change the output of the image carrier device 6 as process circuits. Therefore, if the output of the video circuit 37 is converted into two parts and used in this state,
The image quality will be evaluated for the video output which is in a state of distortion/v due to the action of the process circuit.

Therefore, during recording, it is preferable that the binarization circuit 40 be placed before the process circuit.

A detailed explanation will be given below using FIGS. 9 and 10. 9th
The figure shows the amount of light incident on the imaging device 6 by the preamplifier 3.
FIG. 6 is a diagram showing the relationship between the signal outputs of No. 6 and the signal outputs of the process circuits described above. In FIG. 9, the input light 01 to the imaging device 6 corresponding to the optimum white level is assumed to be 100%, and the signal output of the preamplifier 36 thereafter is 10 = 0.
．． It is assumed that the standard output is 7V. If the gamma 1 value of the image carrier device 6 is r-1, then the preamplifier 3
The signal output of No. 6 increases in proportion to the amount of incident light, as shown by the solid line l in FIG. The reason why it is saturated at 3Io or more is because it is clipped at the clip level by the preamplifier 36. When the signal output of this preamplifier 36 enters the process circuit as an input, the process circuit p output is
In FIG. 9, the output is as indicated by the broken line ~1. When the amount of incident light is 0 to 100%, the gamma correction circuit operates,
The slope is corrected to γ-0°45. Also, the amount of incident light is 100
In the region of ~200%, the movement of the knee circuit produces an output m1 with an extremely small slope. Light m200-300%
Then, the output of the process circuit is suppressed to a constant voltage m2 by the clip circuit. Therefore, the output of the process circuit is 1 m2.
The photometric information of the device 6 is not transmitted as is.

Therefore, in this embodiment, as shown in FIG.
is provided at the output end of the preamplifier 36 in parallel with the process circuit to improve the accuracy of image quality evaluation during imaging or recording. In addition, the binarization level VS in this case is
As shown in FIG. 9, the voltage E1 is set to correspond to the amount of incident light from 00% to 150%. Further, the binarization level VD is set to a voltage E2 corresponding to the amount of incident light O to 10%.

As shown in FIG. 10, the output of the image carrier device 6 is amplified by a preamplifier 36 and sent to a processing circuit 100 and a binarization circuit 40 for providing a suitable display function on a monitor screen. Note that the black level of the output of the preamplifier 36 is clamped by a clamp circuit 101 in order to stabilize the image quality. When the amount of light incident on the imaging device 6 is insufficient, the AGC circuit 102 of the process circuit 100 receives the output from the main control circuit 20, amplifies the signal voltage, and sends it to the gamma correction circuit 103. Gamma correction circuit 10
3 converts the input into a curve of γ-0,45, and converts the input into the knee circuit 1
Send to 04. When the output of the gamma correction circuit 103 is within a predetermined value, the knee circuit 104 inputs an output m1 with a low slope as shown in FIG. Clip circuit 1051, when the output m1 of knee circuit 104 is greater than a predetermined value,
The output is clipped to an output 1η2 of a constant voltage value. This clipping voltage is selected to be approximately 1 V'.

On the other hand, the signal from the preamplifier 36 that has been subjected to the black level clamping process as described above is supplied to the binarization circuit 40, and is treated as an image quality defect signal as in the previous embodiment. This poor image quality signal is converted into a binary video signal by the imaging circuit 8o and output to the video signal synthesis circuit 50. The other input of the video signal synthesis circuit 50 is the process circuit 1 described above.
This is the raw video input processed by the imaging circuit 106 with the output of 00. The video signal synthesis circuit 50 performs analog addition of the binary video signal and the main video signal to form a composite video, and outputs the synthesized video to a display system 110 such as an electronic viewfinder.

Note that the binarized image quality defect signal is sent to the pixel integration circuit 91. as in the previous embodiment. It is also supplied to the minimum value detection circuit 92. In this way, information indicating the degree of poor image quality is transmitted to the main control circuit 2.
0.

In this way, in this embodiment, since the image quality is judged using the sufficiently reliable output of the preamplifier 36 as photometric information, compared to the first embodiment,
Image quality can be evaluated with higher accuracy. Based on the same idea, in FIG. 10, the output of the preamplifier 36 is directly led to the photometry circuit 30 to control the shutter 5 or the diaphragm 3.

Although an integrating circuit is normally used as the photometry circuit 30, it is also possible to perform photometry within a specific pattern area as shown in FIG. That is, the pattern generation circuit 201 activated by the control signal from the main contouring circuit 20 generates a pattern signal, and based on this pattern signal, the photometry control timing circuit 202 sends out a timing signal specifying a specific area. Then, this timing signal is applied to the analog switch 203 and the integrating circuit 204, thereby obtaining an average photometric signal of a specific area.

It should be noted that the present invention is limited to the above-mentioned embodiments.+
There is no one. For example, as an electronic image display means, a color toning filter is provided on the entire surface of a display device 10 made of liquid crystal or the like,
A color contrast suitable for visual observation may be formed.

Further, the operation switches and modes may be given different types or names depending on the object to which the present invention is applied.

Furthermore, various circuit systems other than the above-mentioned embodiments can be applied.

As recording and reproducing means, optical disks, magnetic disks,
f! It may be possible to use an image memory such as a single-chip tape or a solid-state memory.

In addition, various recording modes can be created using the intermittent function of the present invention.

It is also possible to construct a regenerating seventh.

Further, in the above embodiment °C, the OR output of VS and VD was used as a poor image quality signal, but when VS or VD
Of course, it may be used alone.

Further, in the above embodiment, two threshold levels for binarization, VS and VD, are shown, but the threshold level is not limited to the above two, and for example, VS 1. .

The values may be multi-valued such as VS2..., VDl, VD2, etc., or the values of VS and VD may be variably settable with an external volume on the control panel. In this way, even more accurate image quality evaluation is possible.

Further, in the above embodiment, two discs with slits 12 and 13 are used as the shutter 5, and these discs]2. +3
We have shown a rotary shutter in which the shutter speed is variable by controlling the phase of the front film and rear film.
! A running shutter may also be used.

〔Effect of the invention〕

As explained above, the present invention photoelectrically converts a light image incident through an imaging lens of an electronic camera into a video signal using an image carrier device, and adds this to a binarization circuit consisting of, for example, two comparators. The video signal is converted into a binary signal by the threshold level set in this binary circuit,
This is converted into a binary video signal by an imaging circuit, and supplied to the electronic finder. It is characterized in that a specific portion of the digitized video signal is made effective as photometric information.

Therefore, according to the present invention, it is possible to quickly and accurately evaluate the suitability of the exposure ω of the screen for each part of the screen, and moreover, the area to be evaluated can be set to a desired area on the screen. It is possible to provide an electronic camera that can be identified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of the first embodiment of the present invention, FIGS. 2 and 3 are front and side views showing the structure of the rotary shutter of the same embodiment, and FIG. 4 is the same. FIG. 5 (a'
)(b) is a diagram showing the screen state due to the binary image quality defect signal, and FIGS. 6(a), (b), and 7(a) to (d) are diagrams showing how the area is set by the area setting circuit. 8 is a diagram showing the relationship between the number of abnormal pixels for each condition of aperture and shutter speed, FIG. 9 is a diagram showing the relationship between the preamplifier output and process circuit output with respect to the amount of incident light, and FIG. Block diagram showing the configuration of the second embodiment, No. 11
The figure is a block diagram showing a modification of the photometric circuit in the same embodiment. 1...Subject, 2...Imaging lens, 3...Aperture,
4... Half mirror 15... Shank, 6... Imaging device, 7... Focusing glass, 8... Pentaprism, 9... Eyepiece, 10... Display device, 11...・Half mirror 112, 13... slit
Disc with ~, 14.15... Servo motor, 20...
Main control circuit, 21...Automatic 7/'manual select switch, 22...Image confirmation switch, 23...Record switch, 24...Reproduction switch, 25...Aperture value setter, 26...・Shutter speed setting device, 27...Display changeover switch, 28...Display brightness adjuster, 34...Switch circuit for recording, 3...Switch circuit for playback, 3
8... Selector switch, 40... Binarization circuit, 41...
・First comparator, 42...Second comparator, 43°44
...andoo 1-145...or gate, 70.
. . . Area setting circuit, Sl . . . Composite video signal, S2. S
3... Binarized signal, S4... Binarized image quality poor signal,
Vl... White level setting 1 shift, VD... Black level, v
S...white level setting value, VD...black level setting value,
Pl...Subject, P2...Poor image quality area, P3...
Binarized electronic image. Applicant's representative Patent attorney Atsushi Tsuboi Figure 2B Figure 3 Figure 4, Vl Figure 5 (a) (b) Figure 6 (a) (b) Figure 7 Figure 8

Claims (4)

[Claims] (1) The electronic image carrier main body and the video output of the single image device in this main body are converted into a binary signal with a value set near the saturation level, near the black level, or both as a threshold level. a binarization circuit that converts the binarized signal into a binarized video signal; and an imaging circuit that converts the binarized signal into a binarized video signal; 1. An electronic imaging device comprising: signal supply means for supplying a signal to an electronic viewfinder of the device body; and full stage setting means for validating a specific area of the binarized video signal using photometric information. (2) The area setting means includes an area pattern selection circuit that selects a predetermined area pattern, and an image quality check area designation signal that generates an image quality check area designation signal in accordance with the pattern selected by the area pattern selection circuit. photogenic circuit,
Claim (1) further comprising a gate circuit that passes the binarized signal in response to a designation signal from the image quality check area designation signal generation circuit.
Electronic imaging device as described in Section. (3) The electronic image pickup device according to claim (1), wherein the electronic viewfinder is constituted by a scanning type two-dimensional solid state display element such as a liquid crystal light emitting diode. (4) The signal supply means is characterized in that it includes a display image synthesis circuit that adds the binary video signal from the imaging circuit and the video output from the imaging device to synthesize a display image. An electronic R image device according to claim (1).