JPH10200840A - Image signal recording device, recording and reproducing device, and recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a still picture including no an out-of-focus image by selecting the most in-focus pixel among images obtained by photographing the same image with different focus and completing one still picture. SOLUTION: While a field angle is determined, the same image is supplied as images with different focus from a CCD image pickup element 5 to an image memory 8. The inputted images are compressed by a compressing circuit 9, subdata are added to the images by a subdata adding circuit 10, and the images are recorded on a recording medium 11. After all the images are recorded on the recording medium 11, the images recorded on the recording medium 11 are supplied to the image memory 8 through an expanding circuit 12. A system control 18 performs a sharp image selecting process through a work RAM 20, and selects the most in-focus pixel to generate one still picture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to still image recording of an electronic still camera or a digital VCR, and more particularly to an image signal recording apparatus, a recording / reproducing apparatus, and a recording method capable of improving the function of a focusing system. .

[0002]

2. Description of the Related Art As a conventional electronic still camera, there is known an electronic still camera that compresses a still image signal captured by an image pickup device such as a CCD and records the signal on a recording medium. In the case of this electronic still camera, since an optical lens is used, a blurred portion always occurs in a deep subject.

[0003]

When the number of pixels is large, there are many opportunities for enlarged display. However, when magnifying and displaying a still image obtained from a still camera, image information may not be obtained at all depending on the location due to blurring.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image capable of continuously photographing a plurality of still images necessary for recording and reproducing all parts with just focus when recording and reproducing an object having a depth. An object of the present invention is to provide a signal recording device, a recording / reproducing device, and a recording method.

[0005]

According to the first aspect of the present invention, at the time of recording, an image pickup device for capturing a still image and its video signal are digitally compressed, and the compressed digital image compressed image signal is recorded together with sub data. In an image signal recording apparatus designed to be recorded on a medium, a photographing means for photographing a plurality of images by sequentially changing the focus in one direction with the same subject, and using an image data of a plurality of photographed images, is the most prominent. An image signal comprising image processing means for performing image processing so as to become an image, and image recording means for recording an image subjected to image processing in an area different from a plurality of pieces of photographed data. It is a recording device.

[0006] According to a sixteenth aspect of the present invention, at the time of recording,
An image sensor that captures a still image and its video signal are subjected to digital image compression, the digital image compressed compressed image signal is recorded on a recording medium together with sub-data, and during playback, the compressed image signal is image expanded, and the image is expanded. In an image signal recording / reproducing apparatus in which a signal is displayed on a video monitor, a means for photographing a plurality of images of the same subject while shifting the focus, and using a plurality of photographed data to obtain the most sharp image. An image signal recording / reproducing apparatus comprising: image processing means for performing image processing on an image; and means for recording an image subjected to image processing in an area different from a plurality of pieces of photographed data.

[0007] According to a seventeenth aspect, at the time of recording,
In an image signal recording method in which an image sensor for capturing a still image and its video signal are subjected to digital image compression, and a digital image compressed compressed image signal is recorded together with sub-data on a recording medium, a plurality of the same subjects are shifted in focus. Photographing a plurality of images, performing image processing using a plurality of photographed data so as to obtain the sharpest image, and performing image processing on an area different from the plurality of photographed data. Recording the selected image.

[0008] The subject existence ratio with respect to the distance (perspective) of the image displayed on the viewfinder is calculated, the relationship between the subject existence ratio and the distance is shown in a graph, and a plurality of portions showing the high subject existence ratio are marked with markers. Then, a plurality of images are taken by focusing on the portion with the marker, and the most in-focus pixel is selected from among the plurality of images, and 1
Complete a single still image. Since the completed still image is in focus at all distances, the detailed part can be confirmed with one image.

[0009]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. First, the subject indicated by 1 is
The light is incident on the lens block 2. The lens block 2
Zoom and aperture drive circuit 3 and focus servo 4
Driven by The zoom and aperture drive circuit 3
The focus servo 4 is controlled by a system controller (system controller) 18. Lens block 2
Is supplied to the CCD image pickup device 5.

In the CCD image pickup device 5, incident light from the subject 1 is accumulated as electric charges. As described later, the brightness unevenness detector 21 calculates the cycle and peak phase of the brightness unevenness of the incident light. By controlling the electronic shutter of the CCD image sensor 5 via the electronic shutter drive circuit 6 based on the detection result, the influence of the brightness unevenness is removed. The electronic shutter of the CCD imaging device 5 is driven by an electronic shutter drive circuit 6 and takes in the supplied subject 1.

A control signal from the system controller 18 is supplied to the electronic shutter drive circuit 6, and the electronic shutter drive circuit 6 controls on / off of the electronic shutter. The image is digitized by an A / D converter (not shown), and a digital image signal is supplied to an image memory 8 via a switch 7. This image memory 8 has a capacity to store images of several fields. The image signal stored in the image memory 8 is displayed on the viewfinder 16 via the superimpose circuit 14 and is supplied to the compression circuit 9. The viewfinder 16 is, for example, a liquid crystal display.

The compression circuit 9 compresses the supplied image signal, for example, JPEG (Joint Photograph).
ic Experts Group), the sub-data from the sub-data adding circuit 10 is added to the generated compressed image signal. The compressed image signal to which the sub data has been added is supplied to the recording medium 11. Sub data addition circuit 1
Sub-data supplied from 0 includes, for example, date, time, focus state, shutter speed, aperture state, total number of sheets,
This is information when an image signal such as a number of sheets,. The compressed image signal and the sub data supplied to the recording medium 11 are recorded under the control of the system controller 18. As an example of the recording medium 11, a recording medium such as a semiconductor memory card, a disk-shaped memory, or a tape-shaped memory can be used.

In this embodiment, a plurality of images are picked up by changing the focus of one image at the time of fully automatic shooting or manual shooting, as will be described later. Therefore, after the electronic shutter drive circuit 6 is turned on / off, that is, after one still image is accumulated as electric charge in the CCD image pickup device 5, it immediately moves to the next focus position, and the same processing is performed. This process is performed a specified number of times as described below,
A plurality of still images are recorded on the recording medium 11.

After a plurality of still images designated by the operation system 19 as shown in FIG. 2 are recorded on the recording medium 11, clear image selection processing included in the system controller 18 (Japanese Patent Laid-Open No. 6-70)
(See No. 212), the compressed image signal is read from the recording medium 11 under the control of the system controller 18. The read compressed image signal is supplied to the decompression circuit 12. In the expansion circuit 12, the supplied compressed image signal is expanded, that is, JPEG decoding is performed. Further, the sub data separated from the compressed image signal is supplied to the sub data reading circuit 13.

The expanded image signal is supplied from the expansion circuit 12 to the image memory 8 via the switch 7. The sub data reading circuit 13 reads information such as date, time, focus state, shutter speed, aperture state, total number, number of pages,... From the supplied sub data,
The information is supplied to the system controller 18.

The image signal supplied to the image memory 8 is subjected to a clear image selection process using the work RAM 20 of the system controller 18. By this clear image selection processing, the clearest (in-focus) image in pixel units is selected from a plurality of input images, and one clear still image is completed. One completed still image is supplied from the RAM 20 to the image memory 8. The still image read from the image memory 8 is stored in the superimpose circuit 1 as described above.
4 and is displayed on the viewfinder 16 via
The data is supplied to the compression circuit 9, added with the sub data, and recorded on the recording medium 11 again. At this time, the area of the recording medium 11 where the still image subjected to the clear image selection processing is recorded is
This area is different from an area where a plurality of still images before processing is recorded.

In the superimpose circuit 14, a CCD
The image signal captured from the image sensor 5 and the subject presence ratio signal supplied from the subject presence ratio display circuit 15 are superimposed. The subject presence ratio displayed here is a ratio (%) in which a steep edge is included in an image at a certain distance (far or far). That is, the high subject existence rate means that
This means that there are many sharp edges and there are many in-focus subjects. FIG. 3 shows an example of a graph of the object existence rate displayed by the viewfinder 16. For simplicity,
In FIG. 3, illustration of a captured image that is originally superimposed on a graph is omitted. A signal in which the image signal displayed on the viewfinder 16 and the subject presence rate signal are superimposed is taken out as a video output from the output terminal 17 and displayed on a video monitor or the like.

In the above-described embodiment of the present invention, an example of an operation when performing full automatic photographing will be described. First, the user moves the position of the power switch 31 shown in FIG. 2 from OFF to a camera (multi-focus). The operation system shown in FIG. 2 is an example of switches and keys included in the operation system 19 shown in FIG. When the power switch 31 is set to the camera (multi-focus) position, the system controller 18
Displays a camera image on the viewfinder 16. The user looks into the viewfinder and determines the angle of view using the [zoom +] key or the [zoom-] key. At this time, there is no need to adjust the focus. The system controller 18 determines the shutter speed. The shutter speed is increased when the brightness is sufficient to reduce the influence of camera shake, and is decreased when the brightness is not sufficient.

When the user presses a [fully automatic multi-focus recording] key 34, a fully automatic photographing is performed. First, enter the distance measurement mode, and
Performs the following control. (A) Open the aperture to measure the distance. (B) The focus servo 4 is quickly moved from the current position to the point at infinity. (C) The focus is slowly changed from an infinity point to a near point. (D)
The object existence ratio of the image is calculated by the system controller 18 while moving, and a graph showing the peak of the object existence ratio as shown in FIG. The created graph is displayed on the viewfinder 16 so as to be superimposed on the subject. Further, a graph indicating the focus position as shown in FIG. 3B is created from the state of the aperture, focus, zoom, and the like at this time. (E) Then, a necessary focus position from the focused image information is determined from each peak (FIG. 3A) and each parameter (FIG. 3B), and a marker corresponding to this focus position is displayed as shown in FIG. 3C. (←) is displayed. The markers are displayed in a predetermined number in order from the position having the highest subject existence ratio.

When the focus reaches the near point, a photographing mode is entered, and the system controller 18 performs the following control. (F) Move quickly in the direction of the far point and stop once at the first marker position. (G) As long as the sensitivity can be obtained, stop down the aperture to secure the depth of focus. (H) Here, the electronic shutter drive circuit 6
Is driven, the electronic shutter of the CCD image sensor 5 is turned on, and is turned off after a predetermined time. (I) And C
The image signal from the CD image sensor 5 is transferred to the image memory 8, and the compression circuit 9 performs a compression process on the image signal. In the sub-data adding circuit 10, the date, time,
Information such as a focus state, a shutter speed, an aperture state, a total number, the number of sheets,... Is added to the compressed image signal as sub data, and is recorded on the recording medium 11. In this way, a still image focused at the first marker position is obtained.

(J) Immediately after the electronic shutter of the CCD image pickup device 5 is turned on / off, the focus position is moved and stopped at the next marker (←), and the above-described processing from (f) to (i) is performed. repeat. As described above, by performing imaging at the positions of all the markers, the fully automatic imaging is completed. As a result, the number of still images equal to the number of markers is recorded on the recording medium 11.

A method of calculating the above-described object existence rate will be described. When the focus is moved from the point at infinity to the near point in about one second, about 60 field images can be obtained. F60 to F60 obtained field images
59. 60 field images F0 to F59 are
For example, it is divided into small blocks of 8 pixels x 8 lines,
Let the coordinates of that block be (h, v). The number of pixels where the difference between vertically or horizontally adjacent pixels in each block is larger than a preset threshold value is determined. That is, the number of differences that are larger than a preset threshold value from among the 36 differences (= 6 pixels × 6 lines) are counted. The total number of differences larger than the threshold value is defined as the sharpness of the block, and is stored for each field as shown in FIG.

Blocks having the same coordinates in images of several consecutive fields are compared for each block, and a block having the highest sharpness is obtained. And to the block with the highest sharpness,
For example, as shown in FIG. As an example, the coordinates (2, 1) of the fields F0, F1, and F2 shown in FIG.
, The sharpness of the coordinates (2, 1) of the field F0 is 3, the sharpness of the coordinates (2, 1) of the field F1 is 19, and the sharpness of the field F0 is
The sharpness of the coordinates (2, 1) of 2 is 17. Therefore, the sharpness of the block at the coordinates (2, 1) of the fields F0 to F2 is the highest in the field F1.
As shown in FIG. 4, the coordinates (2, 1) of the field F1
Marked.

Thus, the fields F0 to F59
By comparing all of the blocks, it is possible to know how many blocks (blocks marked with ○) with high sharpness are included in each field. Next, the ratio of the number of blocks determined to have high sharpness to the total number of blocks in each field is expressed as a percentage for each field. For example, the total number of blocks in one field is assumed to be 200, and the number of blocks determined to have high sharpness among the 200 blocks is 25.
Then, 25/200 × 100 = 12.5 (%), and the ratio of the sharpness of the field is obtained.
The obtained ratio of the sharpness is used as the above-described subject existence ratio. If the subject presence ratio indicates a large value, there are many in-focus subjects in this field.

That is, the object existence rate is obtained for each of about 60 fields obtained by moving the focus from the infinity point to the near point in about 1 second, and the distance (far and near) of the about 60 fields Is determined to show a large subject existence rate. It is determined based on the subject existence rate whether or not a steep edge portion is included. The subject existence rate is displayed on the viewfinder 16 as a graph as shown in FIG. FIG. 3 shows that the upper part is distant, the lower part is near, and the object existence rate is higher toward the right.

Then, a focus position (FIG. 3B) necessary for photographing so as not to allow blur exceeding one pixel is determined by the state of the aperture, focus, zoom, and the like. Unnecessary focus positions are removed from the peak position of the subject existence ratio (FIG. 3A) and the calculated focus position (FIG. 3B), and the focus position is determined so as to minimize the required number of images. The focus position thus determined is displayed as a marker (←) in the graph as shown in FIG. 3C.

Next, an example of the operation when performing manual shooting will be described. The user moves the position of the power switch 31 shown in FIG. 2 from OFF to a camera (multi-focus).
Then, the system controller 18 displays the camera image on the finder 16. The user looks into the viewfinder and presses [Zoom +]
Use the key or [Zoom-] key to determine the angle of view. At this time, there is no need to adjust the focus. Then, the user determines the shutter speed and presses the [distance measurement] key 35.

When the [DISTANCE MEASURE] key 35 is pressed, a distance measurement mode is entered, and the system controller 18 performs the following control.
(K) Open the diaphragm to measure the distance. (L) The focus is slowly moved from the point at infinity to the near point. (M) The object existence ratio is calculated while moving, and the calculation result (FIG. 3A) is displayed on the viewfinder 16 as a graph superimposed on the object. Further, a graph (FIG. 3B) indicating the focus position is created from the state of the aperture, focus, zoom, and the like at this time. (N) A marker (←) is displayed at a necessary focus position from each peak (FIG. 3A) and each parameter (FIG. 3B). (O) As far as the sensitivity can be obtained, stop down the aperture to secure the depth of focus. The processing of manual shooting is also substantially the same as the above-described fully automatic shooting from (k) to (o).

Here, the user can look at the marker in the finder, move the cursor to the position of an unnecessary marker with the [cursor move] key, and invalidate it with the [marker OFF] key. Also, a marker that has been invalidated once can be returned to valid with the [Marker ON] key. Whether the marker is valid or invalid is indicated by ×. This makes it possible to prevent the recording of clearly unnecessary subjects when there is a wire mesh or the like in front.

When the user presses the [still image recording] key 33 shown in FIG. 2, the system controller 18 enters a photographing mode and performs the following control. (P) The focus position is quickly moved to the farthest point or the closest point of the valid marker, whichever is closer, and temporarily stopped. (Q) Here, under the control of the electronic shutter drive circuit 6, the electronic shutter of the CCD imaging device 5 is turned on, and is turned off after a predetermined time. (R) Then, the image signal from the CCD image sensor 5 is transferred to the image memory 8. The transferred image signal is
The image compression is performed by the compression circuit 9 and the sub data addition circuit 10
Are recorded on the recording medium 11 together with sub-data such as date, time, focus state, shutter speed, aperture state, total number, number of pages,.

(S) After turning on / off the electronic shutter of the CCD image sensor 5, the focus position is immediately moved to stop at the next valid marker. These operations (q) to (s) are repeated by the number of valid markers. As described above, the manual photographing is completed by photographing at all the valid marker positions. As a result, the number of still images equal to the number of valid markers is recorded on the recording medium 11.

When setting an effective marker during manual photographing, the user can change the aperture to the open side, and accordingly, the image in the viewfinder has a shallower depth of focus and unnecessary background and the like. Can be strongly blurred. When the aperture changes, the required number of sheets is recalculated accordingly, and the position and number of the markers change.

In addition, for several seconds during which a plurality of still images are sequentially photographed, the optical axis does not need to be changed, so that a camera shake correction using a gyro sensor and an active prism is performed.

Here, the compensation for the brightness unevenness of the brightness unevenness detector 21 will be described. When the light source is a fluorescent lamp or a mercury lamp, the brightness changes at a frequency of 100 Hz or 120 Hz. Therefore, if a plurality of images are taken and recorded with a time lag, the shutter speed becomes 1/100 second or 1/100 second. At times other than 120 seconds, the brightness of each image may vary. Therefore, the timing for turning on / off the electronic shutter is as follows.

First, the brightness unevenness detector 21 determines the cycle and peak phase of the brightness unevenness. Then, after the focus position is determined and preparation for turning on / off the electronic shutter is completed, a peak of brightness is waited, and the electronic shutter is turned on / off by a control signal from the electronic shutter driving circuit 6 there. When the change in lightness is small (for example, when a fluorescent lamp and an incandescent light bulb or sunlight are mixed), it is not necessary to set the peak point, but the peak point is adjusted to a cycle of 100 Hz or 120 Hz. By doing so, the brightness becomes uniform.

FIG. 5 is a detailed block diagram of the brightness unevenness detector 21. As shown in FIG. This brightness unevenness detection is mainly used in the shooting mode. The light receiving element 41 converts the brightness of the image displayed on the viewfinder 16 into an electric signal. The converted signal BRT is supplied from the light receiving element 41 to the BPF
(Bandpass filter) 42 and peak detection circuit (PE
EK DET) 47. The BPF 42 is a band-pass filter having a center frequency of 110 Hz. BPF4
The output signal Fin supplied from 2 is supplied to a PLL (phase locked loop).

The PLL comprises a phase comparator (PD) 43, LP
It comprises an F (low-pass filter) 44, a digital VCO (voltage controlled oscillator) 45 and a 1 / N counter 46. The signal Fin from the BPF 42 is
Supplied to In the phase comparator 43, the signal Fin and 1 /
An error signal proportional to the phase difference from the signal Fc supplied from the N counter 46 is output. The error signal is LPF
At 44, unwanted high frequency components are removed and provided to digital VCO 45.

The signal from which the high frequency component has been removed is the VCO 45
And the signal N at a frequency N times that of the signal Fin.
F is output. This signal NF is continuously output even if the input is interrupted slightly. There is a so-called flywheel effect. The signal NF is supplied to 1 / N counters 46 and 48. The 1 / N counter 46 supplies the phase comparator 43 with a signal Fc in which the supplied signal NF is reduced to 1 / N.

The peak detection circuit 47 detects a peak point from the supplied signal BRT. The detected peak point is supplied to a 1 / N counter 48. This peak point is supplied to the 1 / N counter 48 as a reset signal. In the 1 / N counter 48, the signal Fou which falls at the phase of the peak point and makes the supplied signal NF 1 / N
t is output and taken out from the output terminal 49.

FIG. 6 shows a waveform diagram of an example of the brightness unevenness detector 21. From the light receiving element 41, a waveform corresponding to the brightness as shown in the signal BRT is obtained. This signal BRT is just twice (100 Hz or 120 Hz) the power frequency 50 Hz or 60 Hz. The BPF 42 has a center frequency set to 110 Hz to pass both of them.
The frequency of the output is 100 Hz or 120 Hz.
The output of the peak detection circuit 47 is a pulse corresponding to the peak point of the signal BRT. The signal NF is an output of the PLL, is synchronized with the signal Fin, and has a frequency that is N times the frequency. The signal Fout is the output of the 1 / N counter 48 and is obtained by dividing the signal NF by 1 / N. Also, the signal Fou
Since t is reset by the output from the peak detection circuit 47, it falls at the peak point.

Here, when the output level of the signal BRT is extremely low, the signal Fout is not output in the correct phase. However, at this time, there is no problem because the brightness unevenness is almost nonexistent.

FIG. 7 is a waveform chart showing an example of the operation of changing the focus. FIG. 7 shows a process in a shooting mode in which a plurality of images are shot while changing the focus. As described above, in the state where the peak value of the brightness and the fall of the output signal Fout of the brightness unevenness detector 21 coincide with each other and the focus is determined, the LOCK signal becomes high level,
During the period of the high label, the electronic shutter of the CCD imaging device 5 is turned on / off in synchronization with the fall of the signal Fout.
The camera is turned off and shooting is performed. As soon as the electronic shutter is turned off, the LOCK signal goes low and a KICK pulse is generated. In synchronization with the rise of the KICK pulse, the SW signal becomes high level,
In order to move the focus position, a current (acceleration current) for acceleration is supplied to the focus servo 4.

The focus position is moved at a constant speed from the current position (initial value T ₀ ) to the next position (target value T ₂ ). At this time, when the focus servo 4 is moved to a position (T ₁ ) substantially intermediate between the current position and the next position,
Is switched to a current for deceleration (deceleration current). When the target value T ₂ is reached, S
The W signal becomes low level, and the current supplied to the focus servo 4 is also stopped. When the target value T ₂ is reached, L
The OCK signal becomes high level, the signal Fout falls at the peak point of lightness, and the electronic shutter of the CCD image pickup device 5 is turned on / off in synchronization with the fall of the signal Fout, and photographing is performed.

When the electronic shutter is turned off, the LOCK signal goes low, and the KIC
A K pulse is generated, and the same operation is repeated up to the next position. When the acceleration current is supplied to the focus servo 4, the speed is accelerated at a constant acceleration, and when the deceleration current is supplied to the focus servo 4, the speed is reduced at the constant acceleration.

As described above, when the focus is determined, L
When the OCK signal becomes high level and the signal Fout falls thereafter, the electronic shutter of the CCD image pickup device 5 is turned on, and is turned off after a predetermined time. As soon as it is turned off, the operation shifts to the operation of moving the focus to the next position (marker).

In the brightness unevenness detector 21, there is a method in which a signal obtained from the CCD image pickup device 5 is used for detecting brightness unevenness instead of the light receiving element 41. In this case, CCD
Image processing for extracting a lightness unevenness component from an image signal supplied from the image sensor 5 is required.

Here, an example of the alignment of two images having different focuses used in this embodiment will be briefly described. First, in order to select the most in-focus pixel, the position, angle, and size need to be exactly the same. However, images with different focus generally have different sizes, and their positions and angles are slightly shifted. For this reason, there are very few portions that result in the same image. Therefore, in this embodiment, the two images are aligned by performing the defocus processing on the in-focus image and then performing the alignment.

Further, the clear image selection processing will be briefly described. The amount of change in the image is detected for each pixel or area, and an in-focus image is easily selected from a plurality of original images based on the amount of change E, thereby generating an in-focus image for the entire screen. I do. This clear image selection process
Although performed in the system controller 18, the function of the clear image selection processing may not be provided in the camera body but may be provided in another personal computer, and the clear image selection processing may be performed on the personal computer. This clear image selection processing may be performed immediately after recording, instead of immediately after recording, by recording a plurality of subjects for one day and changing various parameters while looking at the large screen.

[0049]

According to the present invention, when a subject having a depth is photographed, all parts are in just focus, so that even complicated mechanical details can be displayed by displaying only one image. You can know in detail.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of an operation system according to the present invention.

FIG. 3 is a schematic diagram illustrating an example of an existence rate according to the present invention.

FIG. 4 is a schematic diagram for explaining a subject existence rate according to the present invention;

FIG. 5 is a block diagram of an example of a brightness unevenness detector according to the present invention.

FIG. 6 is a timing chart of an example of a brightness unevenness detector according to the present invention.

FIG. 7 is a timing chart of one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... Lens block, 3 ... Zoom and aperture drive circuit, 4 ... Focus servo,
5 ... CCD image sensor, 6 ... Electronic shutter drive circuit, 7 ... Switch, 8 ... Image memory, 9
.... compression circuit, 10 ... sub data addition circuit, 1
DESCRIPTION OF SYMBOLS 1 ... Recording medium, 12 ... Decompression circuit, 13 ... Sub-data reading circuit, 14 ... Adder, 15 ...
Object existence ratio display circuit, 16 ... viewfinder,
18 ... system control, 19 ... operation system, 20 ... R
AM, 21 ... Lightness unevenness detector

Claims (17)

[Claims] An image pickup device for capturing a still image and a video signal thereof are digitally compressed at the time of recording, and an image signal recording device is configured to record the digital image compressed compressed image signal together with sub-data on a recording medium. A photographing means for photographing a plurality of images of the same subject by sequentially changing the focus in one direction; and an image processing for performing image processing so as to obtain the most sharp image using the data of the plurality of photographed images. And an image recording means for recording the image subjected to the image processing in an area different from the plurality of pieces of photographed data. 2. The image signal recording apparatus according to claim 1, wherein the presence of the subject is checked before taking the plurality of images. 3. The image signal recording apparatus according to claim 2, wherein a focus position is searched to check for the presence of the subject. 4. The image signal recording apparatus according to claim 2, wherein: an area dividing unit that divides a plurality of images obtained from the photographing unit into small areas; and a vertical or horizontal pixel for each area. Comparing the difference with a preset threshold value, counting the number of pixels determined to be larger than the threshold value, and storing the counted pixel number for each of the regions; Comparing the number of pixels of the region at the same position of the image of the image, storing the region including a large number of pixels,
An image signal recording apparatus, comprising: a ratio calculating unit that calculates a ratio of an area including a large number of pixels stored in the image. 5. The image signal recording apparatus according to claim 2, wherein a subject existence ratio of each image having a different focus position obtained by the search is graphed and displayed on a viewfinder or a video monitor. Image signal recording device. 6. The image signal recording apparatus according to claim 2, wherein a marker is displayed at a focus position where the subject exists. 7. The image signal recording apparatus according to claim 2, wherein when the cursor is moved to a marker, the marker is immediately focused at the position of the marker and an image is taken. 8. The image signal recording apparatus according to claim 2, wherein it is possible to set whether or not to take an image at a position where a marker is attached. 9. The image signal recording apparatus according to claim 2, wherein, when investigating the existence ratio of the subject, an aperture is opened to perform the investigation. 10. The image signal recording apparatus according to claim 1, further comprising a fully automatic mode that enables photographing by simply operating a power switch, an angle of view adjustment, and a recording button. Signal recording device. 11. The image signal recording apparatus according to claim 1, further comprising means for performing camera shake correction using a gyro sensor and an active prism. 12. The image signal recording apparatus according to claim 1, wherein the sub-data is information including a focus state, a shutter speed, an aperture state, a value of camera shake correction, and time. Recording device. 13. The image signal recording apparatus according to claim 1, further comprising: brightness unevenness detecting means for detecting a frequency of a flickering light source and a peak point; An image signal recording apparatus comprising: an electronic shutter synchronizing means for opening and closing the electronic shutter in synchronization. 14. The image signal recording apparatus according to claim 13, wherein said brightness unevenness detecting means uses an output of said image sensor. 15. An image signal recording apparatus according to claim 13, wherein said brightness unevenness detecting means uses an output of an optical sensor different from said image sensor. 16. At the time of recording, an image sensor for capturing a still image and its video signal are subjected to digital image compression, and the digital image-compressed compressed image signal is recorded on a recording medium together with sub-data. Means for photographing a plurality of images of the same subject while shifting the focus, and processing the plurality of data of the photographed images on a video monitor. Image processing means for performing image processing so as to use the most sharp image, and means for recording the image subjected to the image processing in an area different from the plurality of photographed data. An image signal recording / reproducing device, characterized by comprising: 17. An image signal recording method for recording an image pickup device for capturing a still image and a video signal at the time of recording, and recording the digital image-compressed compressed image signal together with sub-data on a recording medium. Photographing a plurality of images of the same subject while shifting the focus; performing image processing using the data of the plurality of photographed images so as to obtain the sharpest image; Recording the image on which the image processing has been performed in an area different from the data.