JP2000224539A - Electronic image pickup unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record many photographic frames of digital image data. SOLUTION: This image pickup unit allows a compressing/extending part 21 to execute pre-compression and main compression in common, stores code data obtained by pre-compressing a video signal outputted from CCD(solid-state image pickup device) 2 in a buffer memory 7, extends code data stored in this memory 7 and then maincompresses it by a main compressibility coefficient B smaller than a pre-compression coefficient A to record it in a memory card 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic imaging apparatus for compressing a video signal obtained by imaging a subject and recording the compressed video signal on a recording medium.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of such an electronic image pickup apparatus.

[0003] This electronic image pickup apparatus uses JPEG (Joint Photog), which is an international standard for compression of color still images.
The structure adopts the irreversible method of the Raphic Coding Experts Group).

An image pickup lens system 1 incorporates a CCD (solid state image pickup device) 2, and the output terminal of the CDD 2 is an A / D
It is connected to the converter 3. The A / D converter 3 is connected via a bus 4 to a control unit 5 including a CPU and the like. The control unit 5 includes, in addition to the A / D converter 3, a Y / C unit 6 and a buffer memory 7, which perform processing of image luminance and color difference via the bus 4, an irreversible data compression unit 8, a memory, and the like. The card 9 and the display unit 10 are connected.

With such a configuration, when an image of the subject Q is captured through the imaging lens system 1, the CCD 1 photoelectrically converts the image of the subject Q and converts the video signal into an A / D converter 3.
To send to. The A / D converter 3 converts a video signal from the CCD 1 into digital image data and divides the digital image data into blocks of 8 × 8 pixels. Then, the digital image data is processed for luminance and color difference of the image by the Y / C unit 6 and stored in the buffer memory 7.

Next, the data compression section 8 reads out the digital image data stored in the buffer memory 7, performs DCT (discrete cosine transform) for each block of the digital image data, and subsequently performs each of the luminance and color difference. Quantization is performed using a quantization table to obtain code data.

At this time, the number of photographed frames of the digital image data recorded on the memory card 9 is specified as, for example, 24, so that the digital image data for the number of photographed frames is recorded on the memory card 9. The code amount when compressing the image is controlled. This code amount control is
As shown in FIG. 10, there is a relationship between the compression rate and the code amount, and the code amount is changed, for example, from f1 to f2 according to this relationship.

[0008] The code data obtained by the compression of the data compression section 8 is recorded on the memory card 9.

[0009]

In the above apparatus, however, the digital image data is compressed and recorded on the memory card 9, but the digital image data is recorded for each photographing frame as shown in FIG. For this reason, it is difficult to record a large number of digital image data on the memory card 9.

Therefore, the recording capacity of the memory card 9 may be increased. However, the memory card 9 consumes a large amount of power, and as the recording capacity increases, the mounting area increases and the cost increases.

On the other hand, in the case of continuous photographing, for example, three to ten frames are continuously photographed per second, so that code data is recorded on the memory card 9 for each photographed frame. In addition to the fact that the code data of all the shot frames cannot be recorded on the memory card 9, the code data of each shot frame cannot be reliably recorded on the memory card 9 in accordance with the continuous shooting speed. There is also.

An object of the present invention is to provide an electronic image pickup apparatus capable of recording digital image data of a large number of frames.

[0013]

According to a first aspect of the present invention, there is provided an image pickup means for picking up an image of a subject and converting it into a video signal, a compression means for both pre-compression and main compression, and a video signal converted by the image pickup means. Storage means for storing code data obtained by pre-compressing the data by a compression means, expansion means for reading and expanding the code data stored in the storage means, and a video signal expanded by the expansion means And a recording medium for recording code data obtained by the main compression.

According to a second aspect of the present invention, in the electronic imaging apparatus according to the first aspect, the main compression by the compression unit is performed based on information at the time of performing the pre-compression.

According to the third aspect, in the electronic imaging apparatus according to the first aspect, the main compression ratio of the compression unit is larger than the pre-compression ratio.

According to a fourth aspect of the present invention, there is provided an electronic imaging apparatus which continuously captures a plurality of frames of a subject, compresses a video signal corresponding to the plurality of frames, and records the compressed video signal on a recording medium. Imaging means for converting the image signal into a signal, and compression for compressing a video signal of a predetermined frame among a plurality of continuous video signals converted by the imaging means based on compression information used for a photographing frame preceding the predetermined frame. Means,
It is an electronic imaging device provided with.

According to a fifth aspect, in the electronic imaging apparatus according to the fourth aspect, the compression means has a function of pre-compressing the video signal and a function of fully compressing the video signal.

According to a sixth aspect of the present invention, in the electronic imaging apparatus according to the fifth aspect, the amount of change in the compression ratio for the video signal of a plurality of continuous frames is controlled to be a predetermined value.

According to the present invention, an image pickup means for picking up an image of a subject and converting the image signal into a video signal, a compression means for both pre-compression and main compression, and a pre-compression means for compressing the video signal converted by the image pickup means. Storage means for storing the code data obtained by the decoding, expansion means for reading and expanding the code data stored in the storage means, and a signal for subjecting the video signal expanded by the expansion means to predetermined signal processing An electronic image pickup apparatus comprising: a processing unit; and a recording medium for recording code data obtained by subjecting a video signal processed by the signal processing unit to a main compression by a compression unit.

According to the eighth aspect, an image pickup means for picking up an image of a subject and converting the image signal into a video signal, a compression means for both pre-compression or main compression, and a video signal converted by this image pickup means are pre-compressed by the compression means. Storage means for storing code data obtained by compression, expansion means for reading and expanding the code data stored in the storage means, and performing predetermined signal processing on the video signal expanded by the expansion means A signal processing unit, a recording medium for recording the code data stored in the storage unit or the code data obtained by fully compressing the video signal subjected to the signal processing by the signal processing unit by the compression unit, and a predetermined signal by the signal processing unit. When the processing is performed, the code data that has been fully compressed by the compression means is recorded and controlled on the recording medium, and when the predetermined signal processing is not performed by the signal processing means. An electronic imaging device including a control means for recording control code data which have been pre-compressed, the by compression means against the recording medium.

[0021]

(1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The same parts as those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a block diagram of an electronic image pickup apparatus.

The bus control unit 20 sends an A /
D converter 3, Y / C unit 6, buffer memory 7, display unit 1
0, compression / expansion unit 21, enlargement / reduction unit 22, and card I
/ F (card interface) 23 is connected.
The CPU 24 is connected to the bus control unit 20.

The CPU 24 issues each command and issues an A / D
Converter 3, Y / C unit 6, buffer memory 7, display unit 1
0, the bus control unit 20, the compression / expansion unit 21, the enlargement / reduction unit 22, and the card I / F 23 are controlled to perform a series of photographing operations. Also, this CPU 24
Is connected to a mode setting switch MS for selecting a single shooting mode or a continuous shooting mode, and performs a series of single-shot or continuous shooting photographic operations in accordance with the selection of the mode setting switch MS.

The compression / decompression unit 21 has a compression unit which serves both as a unit for pre-compressing digital image data and a unit for main compression in accordance with the JPEG irreversible system, and has an expansion unit for expanding digital image data. are doing. The pre-compression means pre-compresses the digital image data stored in the buffer memory 7 and stores the code data in the buffer memory 7, and the expansion means reads out the pre-compression code data stored in the buffer memory 7. The compression means has a function of fully compressing the digital image data expanded by the expansion means and recording the coded data on the memory card 9.

Here, the main compression of the compression / expansion unit 21 is performed based on information at the time of performing pre-compression.
For example, the main compression ratio coefficient is set according to the relationship between the main compression ratio coefficient and the pre-compression code amount as shown in FIG. The main compression ratio at this time is set to be larger than the pre-compression ratio.

The enlargement / reduction unit 22 functions as a signal processing unit, and performs enlargement or reduction processing on digital image data stored in the buffer memory 7 or code data stored in the memory card 9. It has a function to apply.

The memory card 9 is provided in the card I / F 23 so as to be freely inserted and removed. Code data that has been compressed or pre-compressed by the compression / expansion unit 21 and the enlargement / reduction unit 22 are provided.
Has an interface function for recording and reading digital image data enlarged or reduced by the memory card 9.

Further, a signal processing unit 25 is connected to the bus 4. The signal processing unit 25 has a function of performing predetermined signal processing, for example, a change in color and a change in sharpness, on the code data expanded by the compression / expansion unit 21.

Next, the operation of the above-configured device will be described.

First, the case of single shooting will be described with reference to the single shooting shooting flowchart shown in FIG.

When the shutter is operated while the mode setting switch MS is set to the single shooting mode, the image of the subject Q is taken into the CCD 1 through the imaging lens system 1 in step # 1, and the CCD 1 # 2
, The image of the subject Q is photoelectrically converted and the video signal is sent to the A / D converter 3. This A / D converter 3 has C
The video signal from the CD 1 is converted into digital image data and divided into blocks of 8 × 8 pixels. Then, the digital image data is converted to Y / C
The processing of the luminance and color difference of the image is performed by the section 6, and subsequently the image is enlarged and reduced by the enlargement / reduction section 22 in step # 4 and stored in the buffer memory 7. In addition to the enlargement / reduction performed by the enlargement / reduction unit 22, the signal processing unit 25 may perform predetermined signal processing on the digital image data, for example, a change in color or a change in sharpness.

Next, in step # 5, the compression / expansion unit 21 reads out the digital image data stored in the buffer memory 7 and pre-compresses the digital image data stored in the buffer memory 7, and stores the code data in the buffer memory 7. .

Next, the compression / decompression unit 21 performs step # 6
In accordance with the relationship between the pre-compression code amount and the main compression ratio coefficient as shown in FIG. 2, the main compression ratio coefficient corresponding to the pre-compression code amount when pre-compression is performed is set. The main compression ratio coefficient is set to be larger than the pre-compression ratio.

Next, the compression / decompression unit 21 proceeds to step # 7
In step 2, the pre-compressed digital image data stored in the buffer memory 7 is read out, and the digital image data is fully compressed using the previously set main compression ratio coefficient.

Next, the code data obtained by the main compression of the compression / expansion unit 21 is stored in the memory card 9 by the bus control unit 20 through the card I / F 23 in step # 8.

Next, the case of continuous shooting will be described with reference to the continuous shooting photographing flowchart shown in FIG.

When the shutter is operated while the mode setting switch MS is set to the continuous shooting mode, in step # 10, the image of the subject Q in the first frame is taken into the CCD 1 through the imaging lens system 1. , This CCD
1 performs photoelectric conversion of the image of the subject Q and sends the video signal to the A / D converter 3 in step # 11. The A / D converter 3 converts a video signal from the CCD 1 into digital image data and divides the digital image data into blocks of 8 × 8 pixels. The digital image data of the first photographed frame is subjected to image luminance and color difference processing by the Y / C unit 6 in step # 12, and the buffer memory 7 is used as reference image data for the second and subsequent photographed frames. Is stored.

Next, in step # 13, the pre-compression means of the compression / expansion unit 21 reads out the digital image data of the first photographed frame stored in the buffer memory 7, and converts this digital image data into, for example, a pre-compression rate. (4
The pre-compression ratio coefficient A is set so as to be 1/1), and pre-compression is performed, and the code data is stored in the buffer memory 7.

Immediately after this, similarly to the above, when the respective digital image data of the second and subsequent frames are sequentially stored in the buffer memory 7, the pre-compression means of the compression / decompression unit 21 sets the buffer memory in step # 13. 7, the digital image data of the second and subsequent frames are sequentially read out, the amount of deviation between the digital image data and the reference image data is detected by a two-dimensional correlation operation, and the image data of these deviations is detected. Is pre-compressed by setting a pre-compression rate coefficient A, and the encoded data is stored in the buffer memory 7.
To memorize.

Next, in step # 14, the CPU 24 determines whether or not the number of consecutively shot frames, for example, 3 to 10 frames, which are continuously shot in one second, has been shot. If not, the process returns to step # 10 to capture the image of the subject Q and perform photoelectric conversion, convert the video signal into digital image data, divide the digital signal into 8 × 8 pixel blocks, and calculate the luminance and color difference of the image. Do the processing,
The code data is pre-compressed by the compression / decompression unit 21 and stored in the buffer memory 7.

When the code data for the number of frames to be continuously shot is stored in the buffer memory 7, the enlargement / reduction unit 22
In step # 16, the code data is enlarged or reduced, or the signal processing unit 25 performs predetermined signal processing on the digital image data, for example, a change in color or a change in sharpness.

Next, the compression / decompression unit 21 performs step # 1
7, according to the relationship between the pre-compression code amount and the main compression ratio coefficient as shown in FIG. 2, the main compression ratio coefficient B (<A, for example, smaller than the pre-compression coefficient A when pre-compression is performed). 1/8) is set.

Next, the compression / decompression unit 21 performs step # 1
In step 8, the pre-compressed digital image data stored in the buffer memory 7 is read out, and the digital image data is fully compressed using the previously set main compression ratio coefficient B.

Next, the code data obtained by the main compression of the compression / expansion unit 21 is stored in the memory card 9 by the bus control unit 20 through the card I / F 23 in step # 19.

Next, in step # 20, the CPU 24 finishes recording the digital image data of the number of frames to be continuously shot, for example, 3 to 10 frames to be continuously shot in one second, on the memory card 9. If the photographing has not been completed, the flow returns to step # 15 to read out the digital pixel data stored in the buffer memory 7 and expand or reduce the digital pixel data. So that the actual compression ratio coefficient B (<
A) is set, and the main compression is performed using the main compression ratio coefficient B. Then, the code data obtained by the main compression is stored in the memory card 9.

When code data for a plurality of frames is recorded on the memory card 9 as described above, the code data of the first photographed frame is recorded on the memory card 9 as shown in FIG. In addition, the code data of the second and subsequent photographed frames, each of which has been main-compressed by the main compression ratio coefficient B smaller than the pre-compression coefficient A, are recorded.

As described above, in the first embodiment, the pre-compression and the main compression are shared by the compression / decompression unit 21 and
Code data obtained by pre-compressing the video signal output from the CCD 2 is stored in a buffer memory 7, and after expanding the code data stored in the buffer memory 7, a main compression ratio coefficient smaller than a pre-compression coefficient A B, the data is completely compressed and recorded on the memory card 23. Therefore, the code amount itself of each code data for each photographed frame recorded on the memory card 9 can be reduced, and the number of photographed frames that can be recorded on the memory card 9 is reduced. You can do much.

The pre-compression and the main compression are performed by the compression / decompression unit 2.
By also using as 1, the configuration can be simplified and contributed to downsizing.

Further, in the continuous shooting mode, even if, for example, three to ten frames are continuously photographed per second, each code data for each of these photographed frames can be reliably recorded on the memory card 9. In other words, if a plurality of shot frames are obtained by continuous shooting, the content of the image between the code data of these shot frames does not greatly change, so that the code amount of the code data of the second and subsequent frames can be set accurately. The code data of a large number of photographing frames can be recorded with a more stable power supply. Besides,
Since the pre-compression is performed and the actual compression is performed and recorded on the memory card 9, the code data of each photographed frame can be reliably recorded on the memory card 9 with a reduced recording time.

The code data can be enlarged or reduced by the enlargement / reduction unit 22, or the digital image data can be subjected to, for example, a color change or a sharpness change by the signal processing unit 25.

(2) Next, a second embodiment of the present invention will be described. In the second embodiment, the overall configuration is the same as the configuration of the electronic imaging apparatus shown in FIG. 1 described above, and thus only different portions will be described with reference to FIG.

A different part from the apparatus shown in FIG. 1 is a compression / expansion unit 21. When the compression / expansion unit 21 is set to the continuous shooting mode, the digital image data is pre-compressed this time. The current pre-compression coefficient A ′ is determined based on the code amount and the pre-compression coefficient A at the time of pre-compression, for example, one frame before the frame to be pre-compressed, and this pre-compression coefficient A ′ is used. Pre-compression.

Next, the operation of the apparatus constructed as described above will be described with reference to the continuous photographing flowchart shown in FIG.

When the shutter is operated while the mode setting switch MS is set to the continuous shooting mode, the first
Steps # 10 to # 12 as described in the embodiment.
, The image of the subject Q is captured and photoelectrically converted, the video signal is converted into digital image data, divided into blocks of 8 × 8 pixels, and the luminance and color difference of the image is processed.

Next, the compression / decompression unit 21 performs step # 1
In step 3, the digital image data of the first photographed frame is pre-compressed, and then the digital image data of the first photographed frame is used as the reference image data to determine the deviation from each digital image data of the second and subsequent photographed frames. Pre-compress image data. At this time, the current pre-compression coefficient A ′ is determined based on the code amount and the pre-compression coefficient A in the pre-compression of the previous frame, and pre-compression is performed using the pre-compression coefficient A ′. Then, this pre-compression is repeated by the number of consecutively shot frames. This operation is repeated by the number of frames to be continuously shot, and each code data is stored in the buffer memory 7.

When the code data for the number of consecutively shot frames is stored in the buffer memory 7, steps # 15 to # 15 are performed in the same manner as described in the first embodiment.
In step 20, the code data stored in the buffer memory 7 is read out and subjected to enlargement / reduction, a change in color, a change in sharpness, etc., and thereafter, the compression / expansion unit 21 performs main compression so as to be smaller than the pre-compression coefficient A. Rate coefficient B (<
A) is set, and the main compression is performed using the main compression ratio coefficient B. Then, the code data obtained by the main compression is stored in the memory card 9.

When the code data for a plurality of frames is recorded on the memory card 9 as described above, the code data of the first photographed frame is recorded on the memory card 9 as shown in FIG. In addition, the code data of the second and subsequent photographed frames, each of which has been main-compressed by the main compression ratio coefficient B smaller than the pre-compression coefficient A, are recorded.

As described above, in the second embodiment, when the compression / expansion unit 21 is set to the continuous shooting mode, when the digital image data is pre-compressed this time, the frame to be pre-compressed is used. The pre-compression coefficient A ′ is determined this time based on the code amount and pre-compression coefficient A at a pre-compression of a predetermined frame before, for example, one frame before, and pre-compression is performed using the pre-compression coefficient A ′. With this configuration, for example, the code data of 3 to 10 frames continuously shot in one second can be reliably recorded on the memory card 9. or,
Although the number of frames that can be recorded is specified in the memory card 9, the recording of code data for the number of frames can be secured.

(3) Next, a third embodiment of the present invention will be described. In the third embodiment, the overall configuration is the same as the configuration of the electronic imaging apparatus shown in FIG. 1. Therefore, only different portions will be described with reference to FIG.

In the third embodiment, similarly to the second embodiment, when the function of the compression / expansion unit 21 is set to the continuous shooting mode, the digital image data is compressed this time. The compression coefficient B ′ is determined this time on the basis of the code amount and the compression coefficient B at the time of compression one frame before the frame to be compressed, and the compression is performed using the compression coefficient B ′. The continuous shooting operation is performed according to a shooting flowchart shown in FIG.

Next, the shooting operation of continuous shooting will be described with reference to the shooting flowchart shown in FIG.

When the shutter is operated while the mode setting switch MS is set to the continuous shooting mode, in step # 21, the image of the subject Q of the first frame is taken into the CCD 1 through the imaging lens system 1. , This CCD
1 performs photoelectric conversion on the image of the subject Q and sends the video signal to the A / D converter 3 in step # 22. The A / D converter 3 converts the video signal from the CCD 1 into digital image data, divides the digital image data into blocks of 8 × 8 pixels, and stores the blocks in the buffer memory 7.

Next, in step # 23, the CPU 24 determines whether or not the number of continuously shot frames, for example, 3 to 10 frames continuously shot in one second has been shot, and the shooting is terminated. If not, the flow returns to step # 21 to take in the image of the subject Q and perform photoelectric conversion, convert the video signal into digital image data, divide it into blocks of 8 × 8 pixels, and store them in the buffer memory 7. .

When digital image data corresponding to the number of frames to be continuously shot is stored in the buffer memory 7, the Y / C unit 6
Reads the digital image data stored in the buffer memory 7 in step # 24, and processes the luminance and color difference.

Next, the compression / decompression unit 21 performs step # 2
In step 5, when the digital image data is compressed, the current compression coefficient B ′ is determined based on the code amount and the compression coefficient B at the time of compression one frame before the frame to be compressed, and the following step # 26, the determined compression coefficient B '
Perform compression using. For example, if the compression coefficient of the first photographed frame is B1 (for example, 1/8), the compression coefficient B2 of the second photographed frame is determined based on the compression coefficient B1 of the first photographed frame and its code amount. , Compression coefficient B3 for the third frame of shooting
Is determined on the basis of the compression coefficient B2 of the second frame and the code amount thereof.
Is determined based on the compression coefficient B (n-1) of the (n-1) th frame and the code amount thereof.

Next, the compression / decompression unit 21 performs step # 2
In 6, using the compression coefficient Bn determined above, Y /
The digital image data after the C processing is compressed.

Next, the code data obtained by the compression of the compression / expansion unit 21 is stored in the memory card 9 by the bus control unit 20 through the card I / F 23 in step # 27.

Next, in step # 28, the CPU 24 finishes recording the digital image data of the number of frames to be continuously shot, for example, 3 to 10 frames to be continuously shot in one second, on the memory card 9. If the shooting has not been completed, the flow returns to step # 24 to perform compression, and the code data obtained by the main compression is stored in the memory card 9.

As described above, in the third embodiment, as in the second embodiment, for example, each code data of 3 to 10 frames continuously shot in one second is reliably stored in the memory card 9. Can be recorded. Also, the memory card 9
Specifies the number of frames that can be recorded, but the recording of code data for the number of frames can be secured.

(4) Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the overall configuration is the same as the configuration of the electronic imaging apparatus shown in FIG. 1 described above, and thus only different portions will be described with reference to FIG.

This apparatus eliminates the function of the compression / expansion unit 21 and, when the compression / expansion unit 21 is set to the continuous shooting mode, compresses the digital image data this time. Also has a function of determining the current compression coefficient B ′ based on the code amount and the compression coefficient B at the time of compression of a predetermined frame, for example, one frame before, and performing compression using this compression coefficient B ′. .

The compression / expansion unit 21 sets the amount of change in the compression ratio for the video signals of a plurality of continuous frames to a predetermined predetermined value, for example, a compression coefficient B such that the compression ratio does not change by 20% or more. 'Has the function of controlling.

Next, the operation of the apparatus configured as described above will be described with reference to the continuous shooting photographing flowchart shown in FIG.

When the shutter is operated while the mode setting switch MS is set to the continuous shooting mode, the first
Steps # 10 to # 12 as described in the embodiment.
, The image of the subject Q is captured and photoelectrically converted, the video signal is converted into digital image data, divided into blocks of 8 × 8 pixels, and the luminance and color difference of the image is processed.

Next, the compression / expansion unit 21 performs step # 1
3, when the digital image data is compressed this time, the current compression coefficient B ′ is calculated based on the code amount and the compression coefficient B at the time of compression one frame before the frame to be compressed.
Is determined, and compression is performed using the compression coefficient B ′. At this time, the compression / expansion unit 21 controls the amount of change in the compression ratio to a predetermined value, for example, the compression coefficient B ′ such that the compression ratio does not change by 20% or more. Then, this compression is repeated by the number of consecutively shot frames. This operation is repeated by the number of frames to be continuously shot, and each code data is stored in the buffer memory 7.

When the code data for the number of frames to be continuously shot is stored in the buffer memory 7, the buffer memory 7 is stored in the buffer memory 7 in step # 15, as described in the first embodiment. The stored code data is read out, and the code data is stored in the memory card 9 in the next step # 19.

As described above, according to the fourth embodiment, as in the second embodiment, for example, each code data of 3 to 10 frames continuously shot in one second can be reliably stored in the memory card 9. Can be recorded. Also, the memory card 9
Specifies the number of frames that can be recorded, but the recording of code data for the number of frames can be secured.

Further, the compression / expansion unit 21 controls the amount of change in the compression ratio to a predetermined value, for example, the compression coefficient B 'such that the compression ratio does not change by more than 20%. This is effective in a case of a large change, and can prevent a calculation error of the code amount.

(5) Next, a fifth embodiment of the present invention will be described with reference to the drawings. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 8 is a block diagram of the electronic image pickup apparatus.

In this apparatus, the CPU 30 controls the enlargement / reduction unit 22 and the signal processing unit 25 to perform enlargement / reduction, color change,
When a change in sharpness or the like is performed, the compression / expansion unit 21 controls the recording of the encoded data in the memory card 9, and the enlargement / reduction unit 22 and the signal processing unit 25 perform enlargement / reduction and color change. When the sharpness is not changed, the memory card 9 has a function as a control unit for controlling the recording of the code data pre-compressed by the compression / expansion unit 21.

With such a configuration, the enlargement / reduction unit 2
2 and the code data to be recorded on the memory card 9 is completely compressed code data or pre-compressed code data in accordance with the presence or absence of application such as enlargement and reduction, color change, and sharpness change by the signal processing unit 25. And the photographing flowchart of the continuous photographing shown in FIG. 4 or FIG. 7 can be automatically selected for photographing. Note that the description of the operation of the continuous shooting photographing flowchart shown in FIG. 4 or FIG.

[0084]

As described above, according to the present invention, it is possible to provide an electronic image pickup apparatus capable of recording digital image data of a large number of frames.

Further, according to the present invention, in the continuous shooting mode, the amount of code of the image between the code data of each photographed frame can be reduced, and the code image data of a larger number of photographed frames can be recorded. Can be provided.

Further, according to the present invention, it is possible to provide an electronic image pickup apparatus capable of reliably recording the code data of each photographed frame on a recording medium in accordance with the speed of continuous shooting and shortening the recording time.

Further, according to the present invention, it is possible to provide an electronic image pickup apparatus which is effective when the content of an image largely changes and which can prevent a calculation error of a code amount.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an electronic imaging apparatus according to the present invention.

FIG. 2 is a diagram showing a relationship between a pre-compression code amount and a main compression ratio coefficient of a compression / expansion unit in the apparatus.

FIG. 3 is a flowchart of single-shot shooting by the apparatus.

FIG. 4 is a flowchart of continuous shooting by the apparatus.

FIG. 5 is a schematic diagram showing a plurality of code data recorded on a memory card by the device.

FIG. 6 is a flowchart of continuous shooting of an electronic imaging apparatus according to a third embodiment of the present invention.

FIG. 7 is a shooting flowchart of continuous shooting in a fourth embodiment of the electronic imaging apparatus according to the present invention.

FIG. 8 is a configuration diagram showing a fifth embodiment of the electronic imaging apparatus according to the present invention.

FIG. 9 is a configuration diagram of a conventional electronic imaging device.

FIG. 10 is a diagram showing a relationship between a compression rate and a code amount in code amount control in the device.

FIG. 11 is a schematic diagram showing digital image data of a plurality of photographed frames recorded by the apparatus.

[Explanation of symbols]

 1: imaging lens system, 2: CCD (solid-state imaging device), 3: A / D converter, 6: Y / C unit, 7: buffer memory, 9: memory card, 20: bus control unit, 21: compression / Decompression unit, 22: enlargement / reduction unit, 23: card I / F, 24, 30: CPU, 25: signal processing unit, MS: mode setting switch.

Continued on the front page F term (reference) 5C022 AA13 AB00 AB68 AC52 AC69 CA00 5C053 FA09 FA14 FA27 GA11 GB21 GB28 JA24 KA04 KA21 KA24 LA01 LA06

Claims (8)

[Claims] An image pickup means for picking up an image of a subject and converting the image signal into a video signal; a compression means for pre-compression or main compression; and a pre-compression of the video signal converted by the image pickup means by the compression means. Storage means for storing the code data stored in the storage means; expansion means for reading and expanding the code data stored in the storage means; and a code obtained by fully compressing the video signal expanded by the expansion means by the compression means. An electronic imaging apparatus, comprising: a recording medium for recording data. 2. The electronic imaging apparatus according to claim 1, wherein the main compression by the compression unit is performed based on information at the time of performing the pre-compression. 3. The electronic imaging apparatus according to claim 1, wherein a main compression ratio of the compression unit is larger than the pre-compression ratio. 4. An electronic image pickup apparatus which continuously captures a plurality of frames of a subject, compresses video signals corresponding to the plurality of frames, and records the compressed video signals on a recording medium. Means, and compression means for compressing a video signal of a predetermined frame among the video signals of the plurality of continuous frames converted by the imaging means based on compression information used for a shooting frame preceding the predetermined frame. An electronic imaging device, comprising: 5. The electronic imaging apparatus according to claim 4, wherein said compression means has a function of pre-compressing said video signal and a function of main-compressing said video signal. 6. The electronic imaging apparatus according to claim 5, wherein the amount of change in the compression ratio for the video signals of the plurality of continuous frames is controlled to be a predetermined value. 7. An image pickup means for picking up an image of a subject and converting the image signal into a video signal; a compression means for both pre-compression and main compression; and a pre-compression means for pre-compressing the video signal converted by the image pickup means. Storage means for storing the obtained code data; expansion means for reading and expanding the code data stored in the storage means; and signal processing for performing predetermined signal processing on the video signal expanded by the expansion means An electronic imaging apparatus comprising: a recording medium for recording code data obtained by subjecting the video signal signal-processed by the signal processing unit to the compression processing by the compression unit. 8. An image pickup means for picking up an image of a subject and converting the image signal into a video signal; a compression means for pre-compression or main compression; and a pre-compression for the video signal converted by the image pickup means by the compression means. Storage means for storing the obtained code data; expansion means for reading and expanding the code data stored in the storage means; and signal processing for performing predetermined signal processing on the video signal expanded by the expansion means Means, a recording medium for recording code data obtained by fully compressing the code data stored in the storage means or the video signal signal-processed by the signal processing means by the compression means, and the signal processing means When the predetermined signal processing is performed by the above, the code data that has been fully compressed by the compression means is controlled to be recorded on the recording medium, and the signal processing means An electronic imaging apparatus, comprising: a control unit that controls recording of code data pre-compressed by the compression unit on the recording medium when predetermined signal processing is not performed.