JPH0870469A - Digital still video camera, image data recording method and device and method for reproducing image data - Google Patents

Abstract

PURPOSE: To enable effective DPCM compressing of image data by predictive encoding. CONSTITUTION: CCD 12 is provided with an RGB filter. A subject is photographed, an RGB signal expressing a subject image is outputted from CCD12 and it is converted into digital RGB data in an A/D converting circuit 13. RGB data is given to an image data re-arraying circuit 20 and re-arrayed so as to be collected at every R, G and B while keeping data order. RGB data which are re-arrayed so as to be collected at every R, G and B is given to a DPCM encoder 25 and DPCM compressing is executed. DPCM-compressed RGB data is recorded in a memory card.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a digital still video camera for recording image data obtained by photographing a subject on a recording medium, a method for recording the image data, and an image for reproducing the image data recorded on the recording medium. The present invention relates to a data reproducing device and an image data reproducing method.

[0002]

BACKGROUND OF THE INVENTION A digital still video camera has been realized which records image data obtained by photographing a subject on a memory card. In such a digital still video camera, it is difficult to record an enormous amount of image data as it is in a memory card, and therefore a method of compressing image data is used. Image data obtained by shooting is compressed and recorded on a memory card.

Data compression in a digital still video camera is a DCT (Discrete Cosine Transform).
) Compression is common. The DCT-compressed image data is Huffman-encoded, for example, and recorded on a memory card.

[0004]

DISCLOSURE OF THE INVENTION It is an object of the present invention to efficiently compress image data using predictive coding and record it on a recording medium.

Another object of the present invention is to enable reproduction of image data recorded on a recording medium which is data-compressed by using predictive coding.

The digital still video camera of the first invention includes a solid-state electronic image pickup device having filters of three primary colors of R, G, and B, and a subject is photographed by using the solid-state electronic image pickup device to obtain a subject image. Means for outputting the R, G, B three primary color signals in the order of the filter arrangement, and the R, G, B three primary color signals output from the above imaging means while maintaining the order in each color signal. , A signal arrangement changing means for changing the arrangement of the R signal, the G signal and the B signal so as to be collected for each of the G signal and the B signal; The present invention is characterized by comprising a predictive coding means for predictive coding, and a recording means for recording the R signal, G signal and B signal predictively coded by the predictive coding means on a recording medium.

The image data recording method according to the first invention is
A subject was photographed using a solid-state electronic image pickup device having G, B three-primary color filters, and R, G, B three-primary color signals representing a subject image were read out from the solid-state electronic image pickup device in the order of filter arrangement and read out. The arrangement of the R, G and B signals is changed so that the three primary color signals of R, G and B are collected for each of the R, G and B signals while maintaining the order in each color signal, and the signal arrangement is changed. The encoded R signal, G signal, and B signal by predictive encoding, and the predictive encoded R signal,
The G signal and the B signal are recorded on a recording medium.

According to the first invention, R (red), G (green),
A subject is photographed by using a solid-state electronic image pickup device having filters of three primary colors of B (blue). The R signal, G signal, and B signal representing the subject image are obtained in the order of the filter array by photographing, and the signal array is changed so that the R signal, G signal, and B signal are collected while maintaining the order in each color signal. To be done. R signal, G signal and B whose signal arrangement is changed
The signal is predictively encoded and recorded on the recording medium.

According to the first aspect of the invention, predictive coding is used as a data compression method for image data. When the data compression of the image data is performed using the predictive coding (for example, when the image data amount is compressed to 1/2 using the DPCM), the compression rate is constant regardless of the correlation of the image data. Therefore, the image quality may deteriorate depending on the image data. In this case, it is possible to effectively prevent the deterioration of the image quality by collecting the data with a strong correlation before compression. In the first aspect of the invention, the signal arrangement is changed so that it is collected for each of the R signal, G signal and B signal, and
Predictive coding is being performed. R signal, G signal and B signal
Correlation is strong in each of the signals. Therefore, the predictive coding can be utilized to achieve effective data compression with little deterioration in image quality.

A digital still video camera according to a second aspect of the present invention includes a solid-state electronic image pickup device having a complementary color filter, an object is photographed using the solid-state electronic image pickup device, and a complementary color signal representing a subject image is arranged in a filter array. The photographing means for reading and outputting in the order of, the signal generating means for generating and outputting the luminance signal and the color difference signal from the complementary color signal outputted from the photographing means, and the luminance signal and the color difference signal outputted from the signal generating means, Signal arrangement changing means for changing the arrangement of the luminance signals and the color difference signals so that the luminance signals and the color difference signals are collected for each of the luminance signals and the color difference signals while maintaining the order corresponding to the order in the complementary color signals, and the signal arrangement is changed by the signal arrangement changing means. Predictive coding means for predictively coding the luminance signal and the color difference signal, and the luminance signal predictively coded by the predictive coding means. And characterized in that it comprises a recording means for recording the color difference signal.

In the image data recording method of the second invention, an object is photographed by using a solid-state electronic image pickup device having a complementary color filter, and complementary color signals representing the image of the object are outputted from the solid-state electronic image pickup device in the order of filter arrangement. A luminance signal and a color difference signal are generated from the read and read complementary color signals, and the generated luminance signal and color difference signal are collected for each luminance signal and color difference signal while maintaining the order corresponding to the order in the complementary color signal. The arrangement is such that the arrangement of the luminance signal and the color difference signal is changed, the luminance signal and the color difference signal with the changed signal arrangement are predictively encoded, and the predictively encoded luminance signal and the color difference signal are recorded on the recording medium.

According to the second invention, the subject is photographed by using the solid-state electronic image pickup device having the complementary color filters of cyan, magenta, yellow and green, for example. Complementary color signals representing the image of the subject are obtained from the solid-state imaging device in the order of the filter array by photographing, and a luminance signal and a color difference signal are generated. The arrangement of the signals is changed so that the luminance signals and the color difference signals are collected for each of the luminance signals and the color difference signals while maintaining the order corresponding to the order in the complementary color signals. The luminance signal and the color difference signal with the changed signal arrangement are predictively coded and recorded on the recording medium.

Also in the second invention, predictive coding is used as a data compression method for image data. When the data compression of the image data is performed using the predictive coding (for example, when the image data amount is compressed to 1/2 using the DPCM), the compression rate is constant regardless of the correlation of the image data. Therefore, the image quality may deteriorate depending on the image data. In this case, it is possible to effectively prevent the deterioration of the image quality by collecting the data with a strong correlation before compression. In the second invention, the signal arrangement is changed so as to be collected for each of the luminance signal and the color difference signal, and
Predictive coding is being performed. Correlation is strong in each of the luminance signal and the color difference signal. Therefore, the predictive coding can be utilized to achieve effective data compression with little deterioration in image quality.

In the image data reproducing apparatus of the third invention, the R, G and B three primary color signals obtained by reading from the solid-state electronic image pickup device are put together for each R signal, G signal and B signal and predictively coded. Reproducing means for reading the R signal, G signal and B signal from the recorded recording medium, decoding means for decoding the predictively coded R signal, G signal and B signal read by the reproducing means, and the above decoding It is characterized by further comprising signal arrangement changing means for changing the R signal, the G signal and the B signal decoded by the means into a signal arrangement corresponding to the output in the output device and outputting the signal arrangement.

In the image data reproducing method of the third invention, the R, G and B three primary color signals obtained by reading from the solid-state electronic image pickup device are put together for each R signal, G signal and B signal and predictively coded. R signal, G signal, and B signal are read from the recording medium recorded as, and the read, predictively coded R signal, G signal, and B signal are decoded, and the decoded R signal, G signal, and B signal Is changed to a signal array corresponding to the output in the output device and is output.

According to the third invention, the predictively coded R signal, G signal and B signal are read and decoded from the recording medium. The decoded R signal, G signal, and B signal are output after being changed into a signal arrangement suitable for output in the output device. As a result, the output device outputs an image represented by the R signal, the G signal, and the B signal stored in the storage medium.

According to the third invention, it is possible to reproduce the R signal, G signal and B signal which have been changed in the signal arrangement and are predictively coded and stored, and the image represented by these R signal, G signal and B signal can be reproduced. It can be output from the output device.

The output device includes, for example, a display device and a printer device.

In the image data reproducing apparatus of the fourth invention, the luminance signal and the color difference signal obtained based on the video signal output from the solid-state electronic image pickup device are collected and predictively coded for each luminance signal and the color difference signal. Reproducing means for reading the luminance signal and the color difference signal from the recorded recording medium, decoding means for decoding the predictive-coded luminance signal and the color difference signal read by the reproducing means, and the luminance decoded by the decoding means It is characterized by further comprising signal arrangement changing means for changing the signal and the color difference signal into a signal arrangement corresponding to the output in the output device and outputting the signal arrangement.

In the image data reproducing method of the fourth invention, the luminance signal and the color difference signal obtained based on the video signal output from the solid-state electronic image pickup device are collected and predictively coded for each luminance signal and the color difference signal. The luminance signal and the color difference signal are read from the recorded recording medium, the read and predictively encoded luminance signal and the color difference signal are decoded, and the decoded luminance signal and the color difference signal are output to the output device. The feature is that it is output after being changed into an array.

According to the fourth aspect of the present invention, the predictive-coded luminance signal and chrominance signal are read from the recording medium and decoded. The decoded luminance signal and chrominance signal are changed to a signal arrangement suitable for output in the output device, output, and given to the output device. As a result, an image represented by the luminance signal and the color difference signal stored in the storage medium is output from the output device.

According to the fourth aspect of the present invention, it is possible to reproduce the luminance signal and the color difference signal recorded by predicting and encoding the signal arrangement, and to output the image represented by the luminance signal and the color difference signal from the output device. You can

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention and is a block diagram showing the electrical construction of a digital still video camera.

The overall operation of the digital still video camera is controlled by the controller 10.

The digital still video shown in FIG.
The camera captures a subject with the CCD 12 having an RGB filter. Digital image data representing a subject image is DPCM by the DPCM encoder 25.
(Differential Pulse Code Modulation) Compressed (predictive coding) and recorded on the memory card.

In DPCM compression, the compression rate is constant,
By grouping the image data into highly correlated data before compression, image quality deterioration due to compression can be effectively prevented. In the RGB image data, the correlation is strong when the R data, the G data, and the B data each have the same kind of data, but the R data and the B data such as the R data, the G data, or the B data are alternately correlated. Is weak.

On the other hand, the reading order of the image data output from the CCD 12 having the RGB filter is in accordance with the R, G, B filter arrangement in the RGB filter. The R, G, and B filter arrangements in the RGB filter are not limited to only R, only G, or only B, and R, G, and B are alternately arranged regularly. Therefore, the image data output from the CCD 12 having an RGB filter has a weak correlation because R data, G data, and B data are output alternately, and even if the image data output from the CCD 12 is DPCM-compressed as it is, there is little deterioration in image quality. Effective compression cannot be expected.

The digital still video shown in FIG.
The camera includes an image data rearrangement circuit 20, and the image data rearrangement circuit 20 has a CCD.
The data of the image data output from 12 is rearranged so that the order of the image data is maintained for each of the R data, G data, and B data. DPCM compression is applied to the rearranged image data. Since the image data is rearranged so as to be grouped into R data, G data, and B data and subjected to DPCM compression, effective data compression with little image quality deterioration can be achieved.

The digital still video camera includes a read control circuit 11 controlled by the controller 10. The read control circuit 11 exposes the CCD 12, C
It is a circuit that controls the reading of the signal charges accumulated in the CD 12.

The light receiving surface of the CCD 12 has an R as shown in FIG.
A GB filter is provided.

Referring to FIG. 2, R provided in the CCD 12
In the GB filter, odd rows are repeated in the order of "R, G, B, G" and even rows are repeated in the order of "B, G, R, G". Therefore, the image signals output from the CCD 12 under the control of the read control circuit 11 are in the order of “R, G, B, G” when the signal charges accumulated in the photodiodes in the odd rows of the CCD 12 are read. When the image signal is repeatedly output and the signal charges accumulated in the photodiodes in the even rows of the CCD 12 are read out, "B, G,
The image signals are repeatedly output in the order of “R, G”.

The analog image signal output from the CCD 12 is applied to the analog / digital conversion circuit 13 and converted into digital image data. The digital image data output from the analog / digital conversion circuit 13 is given to the control device 10 and the image data rearranging circuit 20, respectively.

The image data rearranging circuit 20 is a circuit for rearranging the image data so that the input digital image data is collected in the order of reading for each of R data, G data and B data. Image data sorting circuit
20 includes a first line memory 21 and a second line memory 22. Both the first line memory 21 and the second line memory 22 are memories that can be randomly accessed, and the data to be input is written to the address specified by the given address data, or the data is It is read.

In the first line memory 21 and the second line memory 22, when the image data is written in one line memory, the image data stored in the other line memory is read out. Be done. When writing the image data to the line memory, the image data is collected for each of R data, G data and B data. When the stored image data is read from the line memory, it is sequentially output from the line memory.

The line memories 21 and 22 include areas 21G and 22G for storing G data, areas 21B and 22B for storing B data, and an area 21R for storing R data.
22R is included.

The image data rearrangement circuit 20 includes a rearrangement address generation circuit 14 and a read address generation circuit 15. The rearrangement address generating circuit 14 and the read address generating circuit 15 are controlled by the controller 10 and output address data. Rearrangement address generation circuit 14
The address data output from the read address generation circuit 15 and the line data are output via the changeover switches 17 and 18.
Given to memory 21 or 22. Also, the image data rearrangement circuit which is output from the analog / digital conversion circuit 13
The image data input to 20 is given to the line memory 21 or 22 via the changeover switch 16.

Of the image data obtained based on the image signal output from the CCD 12, the image data obtained based on the signal charges accumulated in the photodiodes of the CCD 12 through the filters in the odd rows are the first line. The image data written in the memory 21 and obtained based on the signal charges accumulated in the photodiodes of the CCD 12 through the even row filters are written in the second line memory 22.

When image data obtained based on the signal charges accumulated in the photodiodes are input to the image data rearranging circuit 20 through the filters of the odd rows of the CCD 12, the changeover switches 16 and 17 are connected to the a terminal side. Then, the changeover switches 18 and 19 are switch-controlled by the control device 10 so that the terminal b side is connected.

Output image data from the analog / digital conversion circuit 13 is also input to the control device 10, and the image data input to the image data rearranging circuit 20 is R data,
Either G data or B data is recognized. First line memory of image data rearrangement circuit 20
When G data is input to 21, the G data storage area 21
Address data that is stored in G, address data that is stored in the B data storage area 21B when B data is input, is stored in the R data storage area 21R when R data is input. The rearrangement address generation circuit 14 is controlled so that such address data is output from the rearrangement address data generation circuit 14.

When image data obtained based on the signal charges accumulated in the photodiodes are input to the image data rearrangement circuit 18 through the filters of the even rows of the CCD 12, the changeover switches 16 and 17 are connected to the b terminal side. Then, the changeover switches 18 and 19 are switch-controlled by the control device 10 so that the terminals a are connected.

When the G data is input to the second line memory 22 of the image data rearranging circuit 20, the address data to be stored in the G data storage area 22G is B
Address data that is stored in the B data storage area 22B when data is input, and address data that is stored in the R data storage area 22R when R data is input are rearranged Address data generation circuit
Rearrangement address generation circuit 14 so that it can be output from 14
Is controlled.

When the image data is written in the first line memory 21, the read address data is output from the read address generation circuit 15 to the second line memory 22 and given to the second line memory 22. To be As a result, the image data stored in the second line memory 22 is read out and given to the DPCM encoder 25 via the changeover switch 19.

When the image data is written to the second line memory 22, the read address data is output from the read address generation circuit 15 to the first line memory 21 and given to the first line memory 21. To be As a result, the image data stored in the first line memory 21 is read and given to the DPCM encoder 25 via the changeover switch 19.

As described above, the image data rearranging circuit 20 rearranges the data so that the R data, the G data, and the B data are collected while maintaining the order in each data, and is output.

The image data output from the image data rearranging circuit 20 is given to the DPCM encoder 25,
M compression is applied. The image data is rearranged in the image data rearrangement circuit 20 so that the R data, the G data and the B data are collected, and D is arranged.
Since the DPCM compression is applied to the PCM encoder 25, effective data compression with little deterioration in image quality is possible.

The image data DPCM-compressed by the DPCM encoder 25 is given to the memory card and recorded.

FIG. 3 is a block diagram showing the electrical construction of the image data reproducing apparatus.

The image data reproducing apparatus shown in FIG. 3 uses the digital still camera shown in FIG.
This is a device that reproduces image data recorded by recording data and B data. In FIG. 3, an image data rearrangement circuit 40 for rearranging the data arrangement of the image data so that the image data collected for each of the R data, G data and B data can be printed on the printer device is included. .

The image data recorded in the memory card is read out and given to the DPCM decoder 31 for data expansion. The decompressed image data is supplied to the image data rearranging circuit 40 and the control device 30, respectively.

The image data rearrangement circuit 40 in the image data reproducing apparatus shown in FIG. 3 is the image data rearrangement circuit in the digital still video camera shown in FIG.
It has almost the same structure as the 40.

Referring to FIG. 3, the image data rearranging circuit 40 in the image data reproducing apparatus includes a first line memory 41 and a second line memory 42. First
The line memory 41 and the second line memory 42 are random accessible memories, and the data to be input or written to the address designated by the given address data is written or read. .

Image data obtained and recorded based on the signal charges accumulated in the photodiodes are written in the first line memory 41 through the filters in the odd rows of the CCD 12 and the second line memory 41 is written. Image data obtained and recorded based on the signal charges accumulated in the photodiodes are written in the memory 42 through the filters of the even rows of the CCD 12.

The image data rearrangement circuit 40 includes a write address generation circuit 32 and a rearrangement address generation circuit 33. The address data output from the write address generating circuit 32 and the rearrangement address generating circuit 33 are transferred to the first line memory via the changeover switches 35 and 36.
41 and a second line memory 42. Also D
The image data output from the PCM decoder 31 is given to the first line memory 41 or 42 via the changeover switch 34.

Areas 41G and 42 for storing G data are stored in the first line memory 41 and the second line memory 42, respectively.
Areas 41B and 42B for storing G and B data and areas 41R and 42R for storing R data are included, respectively.

When the image data is written in the first line memory 41 or the second line memory 42, the DPCM
The write address generation circuit 32 is controlled so that the image data output from the decoder 31 is stored in the same order, and the address data output from the write address generation circuit 32 is stored in the first line memory 41 or the first line memory 41. 2 to the line memory 42. Therefore the first line
R data in the memory 41 and the second line memory 42,
Image data is written collectively for each of the G data and the B data.

When reading the image data written in the first line memory 41 and the second line memory 42,
The first address data is such that the image data collected for each of the R data, G data and B data is output by an array of image data that can be printed by the printer device, and the RGB array of the RGB filter provided in the CCD 12. Line memory 41 and second line memory 42
The rearrangement address generation circuit 33 is controlled so that

As described above, when the image data is written in the first line memory 41, the second line memory 42
Image data is read out from and output via the changeover switch 37. When the image data is written in the second line memory 42, the image data is read from the first line memory 41 and output via the changeover switch 37.

When the image data is written in the line memory 41 or 42, the data collected for each of the R data, G data and B data is written in the same order, and the image data is written from the line memory 41 or 42. When being read, the arrangement of image data is changed and output so that the image can be printed by the printer device. Therefore, the image data output from the image data rearranging circuit 20 is applied to the printer device to obtain a print image.

The image data reproducing apparatus shown in FIG. 3 is provided with a frame memory for storing the image data output from the image data rearranging circuit 40, and the image data is read from the frame memory and displayed on the monitor display device. By doing so, it becomes possible to display the image on the monitor display device.

FIG. 4 shows another embodiment and is a block diagram showing the electrical construction of a digital still video camera.

The digital still video shown in FIG.
In the camera, CCD 52 has cyan (Cy), magenta (Mg), green (G) and yellow (Ye).
Is provided. Luminance data Y and RY and BY color difference data are generated based on the image signal output from the CCD 52 having this complementary color filter, and the generated luminance data Y and RY and BY color difference data are generated. The data is collected for each and recorded on the memory card. Therefore, the digital still video camera shown in FIG. 4 includes a YC generating circuit 60 and an image data rearranging circuit 70.

The readout control circuit 51 controls the readout of the signal charges accumulated in the CCD 52 under the control of the control device 50.

On the light receiving surface of the CCD 52, complementary color filters of cyan, magenta, yellow and green are provided as shown in FIG. In the complementary color filter shown in FIG. 5, cyan and yellow filters are repeatedly arranged in odd rows, and green and magenta are repeatedly arranged in even rows.

The digital still video shown in FIG.
The readout of the signal charges accumulated in the CCD 52 included in the camera is controlled by the so-called 2-line addition readout system. The so-called two-line addition read method is referred to in FIG. 5 in which, in the first field, the signal charge accumulated in the filter of 4n + 1 rows and the signal charge accumulated in the filter of 4n + 2 rows are filtered in the same column. The accumulated signal charges are added and output (called reading of odd-numbered lines), and the signal charges accumulated in the filter of 4n + 3 rows and 4
This is a reading method in which the signal charges accumulated in the filters in the same column are added to the signal charges accumulated in the filters in the n + 4th row and output (called reading of even lines).

In the second field, the odd-numbered lines are read out from the signal charges accumulated in the filter of 4n + 2 rows and the signal charges accumulated in the filter of 4n + 3 rows.
The signal charges accumulated in the filters of the same column are added and output, and the reading of even lines is performed by filtering the signal charges accumulated in the filters of 4n + 4 rows with the filter of the same column among the signal charges accumulated in the filters of 4n + 1 rows. The signal charges accumulated in are added and output.

Since reading in the first field and reading in the second field are the same, reading in the first field will be described below.

According to the 2-line addition read method, the odd lines in the first field are (Cy + G) and (Ye + Mg).
), (Cy + G), (Ye + Mg) ... image data is output from the CCD 52, and (Cy + M) on even lines.
g), (Ye + G), (Cy + Mg), (Ye + G) ...
Image data is output from the CCD 52. Below, Cy,
Handle Mg, Ye, G, B and R as image data.

In the image data thus obtained, the signal charges accumulated in the filter of 4n + 1 rows and 4n
The luminance data Y is obtained as follows by adding the signal charges accumulated in the filters of two adjacent columns to the signal charges accumulated in the filters of the +2 rows, that is, the signal charges accumulated in the odd lines. However, Cy = B + G, Mg
= B + R, Ye = G + R, and Y = 1/2 (2
B + 3G + 2R) is used.

[0069]

## EQU1 ## {(Cy + G) + (Ye + Mg)} / 2 = {(B + G + G) + (G + R + B + R)} / 2 = (2B + 3G + 2R) / 2 ... Equation 1 = Y

Similarly, of the signal charges accumulated in the filters of 4n + 3 rows and the signal charges accumulated in the filters of 4n + 4 rows, that is, the signal charges accumulated in the even-numbered lines, accumulated in the filters of two adjacent columns. The luminance data Y is obtained as follows by adding the generated signal charges.

[0071]

## EQU2 ## {(Cy + Mg) + (Ye + G)} / 2 = {(B + G + B + R) + (G + R + G)} / 2 = (2B + 3G + 2R) / 2 = Y Equation 2

On the other hand, of the signal charges accumulated in the filters of 4n + 1 and the signal charges accumulated in the filters of 4n + 2 rows, that is, the signal charges accumulated in the odd lines, the signal charges accumulated in the filters of the same column are added, By taking the difference between this added value and the adjacent column, an R-Y color difference signal is obtained. However, the fact that it can be regarded as RY = 2R-G is used.

[0073]

## EQU3 ## (Ye + Mg)-(Cy + G) = (G + R + B + R)-(B + G + G) = 2R-G = R-Y Equation 3

Similarly, of the signal charges accumulated in the filters of the 4n + 3th row and the signal charges accumulated in the filters of the 4n + 4th row, that is, the signal charges accumulated in the even-numbered lines,
By adding the signal charges accumulated in the filters in the same column and taking the difference between this added value and the adjacent column, BY color difference data is obtained. However, the fact that it can be regarded as BY = 2BG is used.

[0075]

## EQU4 ## (Mg + Cy)-(Ye + G) = (B + R + B + G)-(G + R + G) = 2B-G = B-Y Equation 4

From the above, the luminance data and the color difference data of RY and BY can be obtained from the complementary color data of cyan, magenta, yellow and green. In this way, from the complementary color data of cyan, magenta, yellow and green, the luminance data Y and RY are obtained.
And a circuit for obtaining BY color difference data has a circuit shown in FIG.
The C generation circuit 60.

The complementary color signals of cyan, magenta, yellow and green output from the CCD 52 are given to the analog / digital conversion circuit 53 and converted into digital complementary color data. The digital complementary color data output from the analog / digital conversion circuit 53 is given to the YC generation circuit 60.

The YC generation circuit 60 includes a 1-pixel delay addition circuit 61.
And a 1-pixel delay subtraction circuit 64. The 1-pixel delay addition circuit 61 is a circuit that performs addition processing according to Equations 1 and 2 and outputs luminance data. The 1-pixel delay subtraction circuit 64 is a circuit that performs subtraction processing according to Expressions 3 and 4 and outputs color difference data of RY and BY.

The complementary color data output from the analog / digital conversion circuit 53 is applied to the YC generation circuit 60, and is also applied to the 1-pixel delay addition circuit 61 and the 1-pixel delay subtraction circuit 64, respectively.

The 1-pixel delay addition circuit 61 includes a D flip
A flop 62 and an adder circuit 63 are included. A pixel clock is connected to the clock input terminal of the D flip-flop 62.
The pulse is given. Therefore, the complementary color data is output from the D flip-flop 62 in synchronism with the complementary color data of the pixels in the adjacent columns, and is supplied to the adder circuit 63. The complementary color data input to the 1-pixel delay addition circuit 61 is also given to the addition circuit 63. Therefore, in the adder circuit 63, 4n + 1 rows and 4n + 1 rows are generated in the first field.
Of the signal charges accumulated in the +2 row filters, the signal charges accumulated in the adjacent two column filters are added, and in the second field, 4n + 3 rows and 4n +
Of the signal charges accumulated in the filters of four rows, the signal charges accumulated in the filters of two adjacent columns are added. That is, in the first field, the addition processing according to the equation 1 is performed, and in the second field, the addition processing according to the equation 2 is performed, and in any case, the luminance data is obtained.

The one-pixel delay subtraction circuit 64 has the following equations 3 and 4:
Is a circuit for generating RY and BY color difference signals based on the above.

In reading the first field, 4n
Of the signal charges accumulated in the filter of the + 1th row and the signal charges accumulated in the filter of the 4n + 2th row, the addition data (Cy + G) or ((Cy + G)) obtained by adding the signal charges accumulated in the filter of the same column (Ye + Mg) always (Ye
It operates so that + Mg)-(Cy + G) is calculated.
In addition, the signal charge accumulated in the filter of 4n + 3 rows and 4
The signal charges accumulated in the filter of n + 4 rows are CCD52
When read from, the addition data (Cy + Mg) obtained by adding the signal charges accumulated in the filters in the same column is added.
) Or (Ye + G) always (Cy + Mg)-(Y
It operates so that e + G) is calculated.

In the 1-pixel delay subtraction circuit 64, 4n +
When the signal charge accumulated in the filter of one row and the signal charge accumulated in the filter of 4n + 2 rows are read, when (Cy + G) in the odd column is read, it is read one pixel clock pulse before. (Ye + Mg) is delayed by one pixel clock pulse and delayed (Ye + Mg)
(Cy + G) read from () is subtracted. When (Ye + Mg) in the even-numbered column is read, (Cy + G) read one pixel clock before is delayed by one pixel clock pulse, and (Cy + G) delayed from (Ye + Mg) read. Is subtracted.

Further, when the signal charges accumulated in the filters of 4n + 3 rows and the signal charges accumulated in the filters of 4n + 4 rows are read out, when (Cy + Mg) in an odd column is read out, one pixel clock pulse before The (Ye + G) read out to is delayed by one pixel clock pulse,
Delayed from read (Cy + Mg) (Ye + G)
Is subtracted. When (Ye + G) in an even column is read out (Cy + M) read out one pixel clock pulse before.
g) is delayed by one pixel clock pulse, and the read (Ye + G) is subtracted from the delayed (Cy + Mg).

In the reading of the signal charges in the second field, the subtraction processing according to the expressions 3 and 4 is performed in the same manner as the reading of the signal charges in the first field.

The 1-pixel delay subtraction circuit 64 includes a D flip
A flop 65, changeover switches 66 and 67, and a subtraction circuit 68 are included.

The complementary color data input to the 1-pixel delay subtraction circuit 64 is given to the D flip-flop 65, the terminal b of the changeover switch 66 and the terminal a of the changeover switch 67, respectively. A pixel clock pulse is applied to the clock input terminal of the D flip-flop 65, and the complementary color data input to the D flip-flop 65 is delayed by one pixel clock pulse and output. The complementary color data output from the D flip-flop 65 is given to the terminal a of the changeover switch 66 and the terminal b of the changeover switch 67, respectively.

Readout of the first field, 4n +
When the signal charge accumulated in the filter of one row and the signal charge accumulated in the filter of 4n + 2 rows are read out, when the (Cy + G) in the odd column is read out, the changeover switches 66 and 67 have the a terminal side. Connected. As a result, the delayed (Ye + Mg) output from the D flip-flop 65 is applied to the positive input terminal and the read (Cy + G) is applied to the negative input terminal of the subtraction circuit 68, and (Ye + Mg) is applied to the negative input terminal.
(Cy + G) is subtracted from + Mg). (Y
e + Mg) is read out, the changeover switch 66 and
67 is connected to the b terminal side. As a result, the signal is output from the D flip-flop 65 to the subtraction circuit 68 and delayed (Cy
+ G) is given to the negative input terminal and the read (Ye + Mg) is given to the positive input terminal, and (Ye + Mg) to (Cy + G)
Is subtracted. Therefore, RY color difference signals are obtained when the filters of the 4n + 1th row and the 4n + 2th row are read out.

Readout of the first field, 4n +
When the signal charges accumulated in the filters in the 3rd row and the signal charges accumulated in the filters in the 4n + 4th row are read out, when the (Cy + Mg) in the odd column is read out, the changeover switches 66 and 67 are set to the b terminal side. Connected. As a result, the delayed (Ye + G) output from the D flip-flop 65 is applied to the negative input terminal and the read (Cy + Mg) is applied to the positive input terminal of the subtraction circuit 68, and (C
(Ye + G) is subtracted from y + Mg). When (Ye + G) in the even-numbered column is read, the changeover switches 66 and 67 are connected to the a terminal side. As a result, the signal is output from the D flip-flop 65 to the subtraction circuit 68 and delayed (Y
e + G) is given to the negative input terminal, and the read (Cy + Mg) is given to the positive input terminal.
G) is subtracted. Therefore, a BY color difference signal is obtained when the filters of 4n + 3 rows and 4n + 4 rows are read.

The reading in the second field is also the first
It is performed in the same way as reading in the field, and R-
Y and BY color difference data are obtained.

R-output from the 1-pixel delay subtraction circuit 64
The color difference data of Y and BY are D flip-flops.
Given to 69. The clock input terminal of the D flip-flop 69 is supplied from a clock pulse having a frequency of 1/2 of the frequency of the pixel clock pulse. As a result, in the D flip-flop 69, the data amount of the color difference data of RY and BY becomes 1/2. In the D flip-flop 69, reduce the amount of color difference data to 1 /
The reason for setting 2 is that the color difference data is at least inconspicuous compared to the luminance data, and therefore the amount of color difference data is reduced to reduce the overall amount of data.

The luminance data Y and the RY and BY color difference data generated in the YC generation circuit 60 are applied to the image data output circuit 70.

The image data output circuit 70 is a circuit for collectively storing the luminance data and the RY and BY color difference data and sequentially outputting them.

The image data output circuit 70 includes a first brightness data line memory 75 and a second brightness data line memory 76 for writing and reading input brightness data Y, and an input RY. RY data line memory 77 and B for writing and reading color difference data
-Y line memories 78 are included respectively.

Of the first luminance data line memory 75 and the second luminance data line memory 76, when the luminance data is written to one line memory, the luminance data is written from the other line memory. Read-out is performed. The image data output circuit 70 also includes a sequential address generation circuit 72, and the address data output from the sequential address generation circuit 72 is used as write address data or read address data as the first luminance data line memory 75. And a second luminance data line memory 76, respectively.

The brightness data input to the image data output circuit 70 is transferred through the changeover switch 71 to the first brightness data line memory 75 or the second brightness data line memory 76.
Is given to and memorized. When the a terminal side of the changeover switch 71 is connected, the luminance data is the first luminance data line
The luminance data is stored in the memory 75, and when the terminal b of the changeover switch 71 is connected, the luminance data is stored in the second luminance data line memory 76.

The luminance data stored in the first luminance data line memory 75 and the second luminance data line memory 76 is output via the changeover switch 79. The connection state of the changeover switch 79 has an inverse relationship to the connection state of the changeover switch 71. When the changeover switch 71 is connected to the a terminal side, the changeover switch 79 is connected to the b terminal side.
When the b terminal side is connected, the changeover switch 79 is connected to the a terminal side. Therefore, one line memory of the first luminance data line memory 75 and the second luminance data line memory 76 is used for writing the luminance data, and the other line memory of the stored luminance data. It will be used for reading.

RY data line memory 77 and B
-One line of Y data line memory 78
When the color difference data is written to the memory, the color difference data is read from the other line memory. The image data output circuit 70 includes a sequential address generation circuit 74
The address data output from the sequential address generation circuit 74 includes the RY data line memory 77 as write address data or read address data.
And the BY data line memory 78.

RY data line memory 77 and B
-Changeover switch in front of Y data line memory 78
73 is connected, and the changeover switch 80 is connected in the latter stage. When RY color difference data is input to the image data output circuit 70, the changeover switch 73 is connected to the a terminal side, and the changeover switch 80 is connected to the b terminal side. Therefore R-
The RY color difference data is written in the Y data line memory 77, and the BY color difference data is read from the BY data line memory 78. B-in the image data output circuit 70
When Y color difference data is input, the selector switch 73 is set to b.
The terminal side is connected, and the changeover switch 80 is connected to the a terminal side. Therefore, B is stored in the BY data line memory 78.
-Y color difference data is written, and RY data line
RY color difference data is read from the memory 78.

The luminance data and the RY and BY color difference data output from the line memories 75 and 76 and the line memories 77 and 78 are supplied to the YC switching circuit 85. After the luminance data Y is output by the YC switching circuit 85, the RY and BY color difference data is output from the image data output circuit 70.

The luminance data and the RY and BY color difference data output from the image data output circuit 70 are DP.
It is given to the CM encoder 25 and DPCM compression is performed.
The DPCM-compressed data is given to the memory card and recorded.

FIG. 6 shows the recording format of the memory card.

Luminance data and RY and B- for each field and line read as shown in FIG.
Y color difference data is recorded.

FIG. 7 is a block diagram showing the electrical construction of a reproducing apparatus for image data recorded on a memory card using the digital still video camera shown in FIG.

The luminance data and the RY and BY color difference data recorded on the memory card are read out and stored in the DP.
It is given to the CM decoder 31 and subjected to data expansion. D
The image data decompressed in the PCM decoder 31 is applied to the changeover switch 93, the YC determination circuit 91 and the field determination circuit 92, respectively.

The YC judging circuit 91 is a circuit for judging whether the image data currently read from the memory card is luminance data, RY color difference data or BY color difference data. The field determination circuit 92 is a circuit for determining whether the image data currently read from the memory card is the image data of the first field or the image data of the second field. YC determination circuit 91 and field determination circuit
The determination at 92 is made by checking at which address the data currently read from the memory card is stored.

The image data reproducing device includes a frame memory
Contains 96. The frame memory 96 includes a first field memory 97 for storing the first field data and a second field memory 98 for storing the second field data. First field memory
97 includes a luminance data storage area 97Y, an RY color difference data storage area 97R, and a BY color difference data storage area 97B. The second field memory 98 also has luminance data storage areas 98Y and RY color difference data storage areas 98R and B-.
A Y color difference data storage area 98B is included.

When the YC determination circuit 91 determines that the image data currently read from the memory card is luminance data, the changeover switch 93 is connected to the a terminal side and the image currently read from the memory card is connected. When the data is RY or BY color difference data, the changeover switch 93 is connected to the b terminal side.

Luminance data is given to the changeover switch 94 via the changeover switch 93, and RY and BY color difference data is given to the changeover switch 95 via the changeover switch 93. Each of the changeover switches 94 and 95 is connected to the a terminal side when the image data of the first field is read from the memory card, and is connected to the b terminal side when the image data of the second field is read from the memory card. To be done.

As a result, the luminance data of the first field is stored in the luminance data storage area 97Y of the first field memory 97 of the frame memory 96, and the RY color difference data is stored in the RY data storage area 97R. Stored in BY
Is stored in the BY data storage area 97B. The luminance data of the second field is stored in the luminance data storage area 98Y of the second field memory 98 of the frame memory 96, and the RY color difference data is stored in the RY data storage area 98R. -Y color difference data is B
-Y data is stored in the data storage area 98B.

The image data stored in the frame memory 96 is read out under the control of the memory controller 99 and given to the monitor display device 101. As a result, the image represented by the image data stored in the memory card is displayed on the monitor display device 101.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a digital still video camera.

FIG. 2 shows a filter array of RGB filters.

FIG. 3 is a block diagram showing an electrical configuration of an image data reproducing device.

FIG. 4 is a block diagram showing an electrical configuration of a digital still video camera.

FIG. 5 shows a filter array of complementary color filters.

FIG. 6 shows a recording format of a memory card.

FIG. 7 is a block diagram showing an electrical configuration of the image data reproducing device.

[Explanation of symbols]

 10, 30, 50, 100 Controller 12, 52 CCD 20, 40 Image data rearrangement circuit 25 DPCM encoder 31 DPCM decoder 60 YC generation circuit 70 Image data output circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 11/04 A 9185-5C

Claims (8)

[Claims] 1. A solid-state electronic image pickup device having filters of three primary colors of R, G, and B, wherein a subject is photographed by using the solid-state electronic image pickup device, and R, G, and B three-primary color signals representing a subject image are filtered. The photographing means for outputting in the order of arrangement, and the R, G, B three primary color signals outputted from the photographing means are arranged so as to be collected for each of the R signal, G signal and B signal while maintaining the order in each color signal. Signal arrangement changing means for changing arrangement of signals, G signal and B signal, R signal, G signal and B whose signal arrangement is changed by the signal arrangement changing means
Digital still video camera provided with predictive coding means for predictively coding a signal, and recording means for recording the R, G and B signals predictively coded by the predictive coding means on a recording medium. . 2. A solid-state electronic image pickup device having a complementary color filter, wherein a subject is photographed using the solid-state electronic image pickup device,
Photographing means for reading and outputting complementary color signals representing a subject image in the order of filter arrangement, signal generating means for generating and outputting a luminance signal and a color difference signal from the complementary color signals output from the photographing means, and output from the signal generating means. Signal arrangement changing means for changing the arrangement of the luminance signals and the color difference signals so that the luminance signals and the color difference signals are collected for each of the luminance signals and the color difference signals while keeping the order corresponding to the order in the complementary color signals. Predictive coding means for predictively coding the luminance signal and color difference signal whose signal arrangement has been changed by the arrangement changing means, and recording means for recording the luminance signal and color difference signal predictively coded by the predictive encoding means on a recording medium. , Digital still video with
camera. 3. An R from a recording medium in which R, G, and B three primary color signals obtained by reading from a solid-state electronic image pickup device are recorded for each R signal, G signal, and B signal and are predictively coded and recorded. Reproducing means for reading signals, G signals and B signals, decoding means for decoding predictive-coded R signals, G signals and B signals read by the reproducing means, and R signals, G decoded by the decoding means An image data reproducing device provided with a signal arrangement changing means for changing a signal arrangement and a B signal into a signal arrangement corresponding to an output in an output device and outputting the signal arrangement. 4. A luminance from a recording medium in which a luminance signal and a color difference signal obtained based on a video signal output from a solid-state electronic image pickup device are collected for each luminance signal and a color difference signal and are predictively coded and recorded. Reproducing means for reading signals and color difference signals, decoding means for decoding predictive-coded luminance signals and color difference signals read from the reproducing means, and output of the luminance signals and color difference signals decoded by the decoding means in an output device An image data reproducing device having a signal arrangement changing means for changing and outputting a signal arrangement corresponding to. 5. An object is photographed by using a solid-state electronic image pickup device having filters of three primary colors of R, G, B, and R, G, B three-primary color signals representing an image of the subject are photographed from the solid-state electronic image pickup device of a filter array. R, G, B read out in order
R signal so that the three primary color signals of R, G, and B signals are collected while maintaining the order in each color signal,
Changing the arrangement of the G signal and the B signal, predictively encoding the R signal, the G signal and the B signal with the changed signal arrangement, and recording the predictively encoded R signal, the G signal and the B signal in a recording medium, Image data recording method. 6. A solid-state electronic image sensor having a complementary color filter is used to photograph an object, complementary color signals representing an image of the object are read out from the solid-state electronic image sensor in the order of filter arrangement, and a luminance signal is read from the read complementary color signal. And a color difference signal are generated, and the arrangement of the luminance signal and the color difference signal is changed so that the generated luminance signal and the color difference signal are collected for each of the luminance signal and the color difference signal while maintaining the order corresponding to the order in the complementary color signal. Then, the luminance signal and the color difference signal whose signal arrangement has been changed are predictively encoded, and the predictively encoded luminance signal and the color difference signal are recorded on the recording medium. 7. A recording medium in which R, G, and B three primary color signals obtained by reading from a solid-state electronic image pickup device are collected for each R signal, G signal, and B signal and are predictively coded and recorded. Signal, G signal and B signal,
Image data for decoding read and predictively coded R, G, and B signals, changing the decoded R, G, and B signals into a signal array corresponding to the output in the output device, and outputting the image data How to play. 8. A luminance from a recording medium in which a luminance signal and a color difference signal obtained based on a video signal output from the solid-state electronic image pickup device are combined and predictively coded for each luminance signal and the color difference signal and recorded. An image in which a signal and a color difference signal are read, the read and predictively coded luminance signal and the color difference signal are decoded, and the decoded luminance signal and the color difference signal are converted into a signal array corresponding to the output in the output device and output. Data playback method.