JPH04301986A - Device and method for recording/reproducing picture - Google Patents

Abstract

PURPOSE:To unnecessitate an inverse orthogonal transformation processing and to generate a high-speed multi-picture by recording DC coefficient data among the orthogonal transforming data of input image data while collecting those data into a specified area different from another orthogonal coefficient. CONSTITUTION:Concerning recording in the recording area of a memory card 8, the reduced data of an image, namely, the DC orthogonal coefficient data are recorded in the specified area, and the parameter of the image such as the encoding parameter or the like is recorded in the other area. In such a case, when reproducing the reduced image like the case of generating the multi- picture, a switch 10 is turned to a closed state, a changeover switch 4 is set to the side of a terminal 4b, and the reduced image data read from the specified area of the memory card 8 are transmitted through a card interface circuit 7, changeover switch 6h and switch 10 to a quantizing/inverse quantizing circuit 52. The DC coefficient data inversely quantized at the circuit 52 are stored through the terminal 4b of the changeover switch 4 to a frame memory 3, converted to analog signals by a D/A converter 2 and outputted.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION The present invention relates to an image recording/reproducing apparatus and method thereof, and more particularly to an image recording/reproducing apparatus and method suitable for image reduction and multi-screen generation that enable high-speed processing and simplified configuration. .

0002

[Prior Art] A camera that uses magnetic disks, IC cards, and other recording media instead of silver halide film as a recording medium for recording optical images, and that records, reads, and plays back through electrical processing is expected to have a promising future. There is. In image recording and playback processing of this type of camera, etc., during recording, a subject image (optical image) passed through an optical system such as a lens is converted into an electrical signal by a photoelectric conversion element such as a CCD, and the image is converted into an electrical signal on a recording medium such as the above-mentioned card. When the subject image is reproduced as a still image, the subject image is reproduced based on electrical signals read from the recording medium. In order to convert the video signal for this subject image into a digital signal and record it on a recording medium, a huge amount of data must be recorded. requires an image data compression method that compresses image data with high efficiency. As an image data compression method, processing of orthogonally transforming image data and variable length encoding is usually widely used.

FIG. 7 shows an example of the configuration of an image signal recording and reproduction processing section in a conventional electronic still camera. The operation switch 21 is a switch that specifies device operations such as image recording/reproduction, and controls the memory control circuits 23 and 25 and the changeover switch 24 via the system control circuit 22. Input image signals obtained from an optical system and a photoelectric conversion section such as a CCD are converted into digital signals by an A/D converter 1 and stored in a frame memory 3. Writing/reading of the frame memory 3 is controlled based on a control signal from a memory control circuit 23, and the digital image signal read therefrom is processed by an orthogonal/inverse orthogonal transform circuit 16 (discrete cosine transform in the following explanation). (DCT) circuit and its inverse conversion (IDCT) circuit, DCT/IDCT
(represented as a circuit). The frame memory 3 is used for operating speed conversion, and is used to convert the operating speed of the A/D converter 1 or the D/A converter 2 and the DCT/I
This is to deal with the discrepancy in data processing speeds after the DCT circuit 6.

Image data compression is performed by dividing a screen image into a plurality of blocks and performing orthogonal transformation processing on each divided block. That is, FIG. 8 (A
), the image signal output from the A/D converter 1 is divided into 1 as each pixel signal constituting one screen.
Following the pixel signals (for example, 720) for the horizontal period (corresponding to row number 1 in the vertical direction in the figure), the pixel signals for the next horizontal period (corresponding to row number 1 in the vertical direction in the figure) are
The pixel signal for the horizontal period corresponding to the vertical row number 2 in the figure is further pixel signal for the horizontal period of the vertical direction number 3, and so on, and so on. pixel signals are output. Furthermore, to divide one screen into multiple blocks, from the frame memory 3, pixel signals of a matrix consisting of a predetermined number of rows and columns from the 576 x 720 matrix pixel signals shown in FIG. Reading is performed as shown. In this example, one block has 8 pixels in the horizontal direction x 8 pixels in the vertical direction, and is read out as block data (specified by 0 to 7 in the horizontal direction and 0 to 7 in the vertical direction) as shown in FIG. 8(B). The block data thus read out is orthogonally transformed by the DCT/IDCT circuit 16 and obtained as orthogonal coefficient data as shown in FIG. The quantization circuit 17 quantizes the coefficient data of FIG. 8(C) in a predetermined manner based on the quantization rules stored in the quantization table 19, and quantizes the coefficient data of FIG. 8(C) in a similar position as shown in FIG. 8(D). It is generated as quantized coefficients arranged in . The encoding/decoding circuit 18 encodes the data quantized by the quantization circuit 16 in a predetermined manner based on the encoding rules stored in the encoding table 20 to obtain a code word, and outputs the code word to the card interface. The data is recorded via a circuit 7 on a recording medium 8 such as a magnetic disk or a memory card (memory card in this example).

During normal image reproduction, a signal read from the memory card 8 is decoded by the encoding/decoding circuit 18, dequantized by the quantization/inverse quantization circuit 17, and then transferred to the DCT/IDCT circuit 16. The signal is inversely orthogonally transformed and supplied to the input terminal 24a of the changeover switch 24 and the frame memory 26. At this time, the selector switch 24 is connected to the input terminal 2.
The input signal to 4a is supplied to frame memory 3. Here, from the DCT/IDCT circuit 16, as shown in FIG.
A pixel-based data signal like this is output. In order to generate one normal screen, a set of pixel signals is read out from the frame memory 3 in the order shown by X in FIG. 8A in response to an address signal from the memory control circuit 23. The signal from the frame memory 3 is converted into an analog signal by the D/A converter 2 and sent to the monitor system as an image signal. Pixel signals are similarly generated for the other blocks, and finally one image signal of the sequence shown by X in FIG. 8(A) is sent to the monitor system.

By the way, when searching a plurality of images recorded on a recording medium and selecting a desired image, conventionally, a plurality of image screens are simultaneously (all at once) displayed on a display unit. For this simultaneous display, each screen is reduced and the images are reduced by thinning processing of image pixels to generate a multi-screen to be displayed simultaneously. In FIG. 7, at the time of multi-screen generation, the changeover switch 24 is selected and set to supply the input signal of the input terminal 24b to the frame memory 3, and the inverse orthogonal transformed data from the DCT/IDCT circuit 16 is transferred to the frame memory 3. 26. Reading from the frame memory 26 is performed based on an address signal from the memory control circuit 25, and pixel data is read out (thinned) at predetermined intervals according to the screen reduction ratio. Such thinning-out reading is performed for all blocks constituting one entire image. In this way, the image signal read from the frame memory 26 is input to the horizontal/vertical filter 27 having a low-pass filter configuration, and high-frequency restriction processing is applied to the image signal in the horizontal and vertical directions, resulting in so-called aliasing. is removed and stored in the frame memory 3 via the changeover switch 24.

[0007]

[Problems to be Solved by the Invention] As mentioned above, in the conventional image reduction method for multi-screen generation, pixel signals obtained by performing inverse orthogonal transformation on orthogonal transformation data read from a recording medium are stored in a frame memory. The images are recorded, subjected to thinning processing according to the image reduction ratio, and aliasing distortion caused by the thinning processing is removed using horizontal and vertical filters. However, in such conventional image reduction methods, data reading from a recording medium, decoding processing, and inverse orthogonal transformation processing by a DCT/IDCT circuit after dequantization processing constitute one image, similar to normal reproduction processing. Since the processing is performed on all pixel signals, and further thinning processing is performed, the processing time until displaying a multi-screen becomes long. In particular, since the inverse orthogonal transform (in this example, the inverse discrete cosine transform) process is complex, it takes time to generate multiple screens, making it impractical. Furthermore, when recording on a magnetic disk, it is necessary to read all image data recorded on the magnetic disk, and movement of the magnetic head cannot be ignored. Furthermore, thinning processing of pixel signals not only requires a frame memory, but also requires band limiting and removal of aliasing distortion that occurs during thinning processing using horizontal and vertical filters. Therefore, it is necessary to prepare separate frame memories and horizontal and vertical filters for thinning processing, which also causes problems in terms of cost and device scale. The above problems are the same even when image reduction processing is performed by computer software, and there are problems with the inverse orthogonal transformation processing time and the need for a temporary recording area for thinning processing, so the memory area of the main recording device is limited. This may lead to overloading and hindering the execution of software processing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image recording/reproducing apparatus and method suitable for performing image reduction processing that enables high-speed processing. Another object of the present invention is to provide an image recording/reproducing device and method that can generate multiple screens at high speed.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to one aspect of the present invention, one screen digital image data is divided into a plurality of blocks, and the image data of each divided block is subjected to orthogonal transformation processing. The orthogonal coefficient data obtained by performing the above are recorded in a first area of the recording medium, and only the DC component data among the orthogonal coefficient data of the plurality of blocks is recorded in a second area separate from the first area. An image recording method is obtained which is characterized in that images are recorded at once. Here, during playback, DC component data for each block of each screen of a plurality of screens is read out from the second area of the recording medium in which the orthogonal coefficient data is recorded, and the DC component data are arranged to form reduced images and displayed simultaneously. A characteristic image reproduction method is also obtained. Further, according to the present invention, one-screen digital image data is divided into a plurality of blocks, and orthogonal coefficient data obtained by performing orthogonal transformation processing on the image data of each divided block is recorded in the first area of the recording medium. At the same time, a first mode in which only the DC component data among the orthogonal coefficient data of the plurality of blocks is collectively recorded in a second area different from the first area; A second mode reads data and performs inverse orthogonal transformation to reproduce the image, and a process of reading the DC component data from the second area and arranging them as one pixel to reduce the image is performed on each recorded image. An image recording/reproducing apparatus is obtained, which is characterized in that it is equipped with a third mode in which a multi-screen is generated for each image. Furthermore, according to another aspect of the present invention, one-screen digital image data is divided into a plurality of blocks, and the orthogonal coefficient data obtained by performing orthogonal transformation processing on the image data of each divided block is stored in the first part of the recording medium. At the same time, the DC coefficient data is extracted from the orthogonal coefficient data of each block to generate a reduced image as one pixel, and the obtained reduced image is divided into blocks again to generate the divided blocks. An image recording method is obtained, characterized in that data obtained by subjecting data to orthogonal transformation and encoding processing is recorded in a second area different from the first area.

0010

[Operation] In the present invention, one-screen digital image data is divided into a plurality of blocks, and orthogonal coefficient data for each divided block of image data is recorded in a first area of a recording medium, and among these orthogonal coefficient data, Only DC component data is collectively recorded in a second area different from the first area. During normal playback, data in the first area is read out and subjected to inverse orthogonal transformation to play back the image. Also, when playing back images in reduced size, such as when generating multi-screens, the second
DC component data is read out from the area and arranged as one pixel to reduce the image and display multiple images simultaneously. Furthermore, DC coefficient data is extracted from the orthogonal coefficient data of each block to generate a reduced image as one pixel, the obtained reduced image is divided into blocks again, and the divided block data is subjected to orthogonal transformation and coding. It is also possible to record data obtained by performing the conversion process in the second area.

00011

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an image recording/reproducing apparatus according to the present invention. In FIG. 1, components given the same reference numerals as those in FIG. 7 indicate components having similar functions. The system control circuit 11 controls the operation of each component of this embodiment, and performs control processing based on instruction information from the operation section 12. The digital image data from the A/D converter 1 is stored in the frame memory 3, and the block image data read from the frame memory 3 is sent to the DCT/IDCT circuit 16 and quantization/inverse quantization circuit 17 shown in FIG. and encoding/decoding circuit 18
DCT/IDCT circuit 51, quantization/inverse quantization circuits 52, 56, and encoding/decoding circuit 5 having the same functions as
3, 57, etc., is supplied to the encoding unit 5. A DCT/IDCT circuit 51 in the encoding unit 5 performs DCT processing on the received block image data, and sends direct current (DC) component data of the obtained orthogonal coefficient data to a quantization/inverse quantization circuit 52. , and sends alternating current (AC) component data to a quantization/inverse quantization circuit 56. The quantization/inverse quantization circuit 52 quantizes the DC component data from the DCT/IDCT circuit 51 in the manner stored in the quantization table 54, and the encoding/decoding circuit 53 converts the quantized data into the encoding table. 55. Similarly, the quantization/inverse quantization circuit 56 and the encoding/decoding circuit 57 convert the AC component data from the DCT/IDCT circuit 51 into the forms stored in the quantization table 58 and the encoding table 59, respectively. quantize and decode based on

The changeover switch 6 has eight terminals 6a to 6h.
, the terminal 6a is connected to the encoding table 55, the terminal 6b is connected to the quantization table 54, the terminal 6c is connected to the encoding/decoding circuit 53, the terminal 6d is connected to the encoding/decoding circuit 57, and the terminal 6 is connected to the encoding/decoding circuit 57.
e is connected to the quantization table 58, terminal 6f is connected to the encoding table 59, terminal 6g is connected to the system control circuit 11, and terminal 6h is connected to the quantization table 58.
are connected to buffer 9 and switch 10, respectively. A predetermined terminal of the changeover switch 6 is selected according to a control signal from the system control circuit 11. Data from the terminal selected by the changeover switch 6 is supplied to the memory card 8 via the card interface circuit 7 and recorded. Also, during playback, contrary to the above process, data read from the memory card 8 is sent to the changeover switch 6 via the card interface circuit 7, and is supplied to each component from the terminals 6a to 6h. .

Now, as shown in FIG. 2A, an image signal constituting one screen is divided into blocks of, for example, 8 pixels in the vertical and horizontal directions. A block f(j,k) indicated by a vertical number j and a horizontal number k is a DCT/IDCT circuit 51
Orthogonal coefficient data F(u, v) similarly denoted by u, v
is converted to These are expressed by (Math. 1) and (Math. 2).

[Math 1]

[Equation 2] The orthogonal coefficient data corresponding to each pixel position of the 8×8 block as shown in FIG.
8×8 quantized data as shown in FIG. 2(F) is obtained. FIGS. 2(C), (E), and (G) show the above ((A) for other blocks in the screen shown in FIG.
Image data, orthogonal transformation data, and quantization data corresponding to B), (D), and (F) are shown.

By the way, in (Equation 1), orthogonal coefficient data F(0,0) where u and v are zero (FIG. 2(D) and (E
The shaded data in ) indicates the direct current (DC) coefficient, so
If this DC coefficient is extracted and treated as one pixel or image data, an image reduced to one of the block size will be obtained, as is clear from FIG. When the block size is 8×8 as shown in Fig. 2, the length, width (vertical direction,
An image is obtained that is reduced to 1/8 in both horizontal and horizontal directions. Therefore, when a screen is generated representing each block image data using the DC coefficients obtained in this way, it becomes a multi-screen.
As shown in FIG. 2(H), there are multiple reduced images (Image A,
B,...) can be displayed simultaneously.

Among the orthogonal coefficient data obtained by the DCT/IDCT circuit 51, DC coefficient data is quantized by a quantization/inverse quantization circuit 52, encoded by an encoding/decoding circuit 53, and then switched. The data is recorded on the memory card 8 via the terminal 6C of the switch 6 and the card interface circuit 7. Similarly, the AC coefficient data is processed by the quantization/inverse quantization circuit 56
After being quantized in the encoder/decoder circuit 57 and encoded in the encoder/decoder circuit 57, the data is recorded in the memory card 8 via the terminal 6d of the changeover switch 6 and the card interface 7. Further, the quantized data indicating the quantization mode stored in the quantization tables 54 and 58 and the encoded data indicating the coding mode stored in the encoding tables 55 and 59 are stored at the terminal 6 of the changeover switch 6.
b, 6e, 6a, and 6f to the card interface 7 as encoded parameters, and recorded on the memory card 8. Here, the DC coefficient data quantized by the quantization/inverse quantization circuit 52 at the same time as the above encoding process is as follows.
The data is stored in the buffer memory 9. Therefore, data regarding an image obtained by reducing the input image is recorded in the buffer memory 9. When input image recording is completed, the reduced image data is read out from the buffer memory 9 and recorded on the memory card 8 via the terminal 6h of the changeover switch 6 and the card interface 7. At this time, the switch 10 is set to the open state.

The orthogonal coefficient data is thus recorded on the memory card 8, but in the present invention, only the DC coefficient data is taken out and the orthogonal coefficient data (DC coefficient data and AC coefficient data) for one image is By recording in different specific areas, when reproducing a multi-screen during a search, a reduced image can be obtained by simply reading data from this specific area. If this is repeated for each image (block image) and displayed simultaneously on the display screen, for example, in the case of a block size of 8 pixels x 8 pixels, a multi-screen of 64 screens will be obtained.

For example, as shown in FIG. 3, recording in the recording area of the memory card 8 is performed in specific areas D(n-1),
n), D(n+1), D(n+2), D(n+3), D
Each area of (n+4)... has images n-1, n, n+1, n
+2, n+3, n+4, ..., that is, DC orthogonal coefficient data F (0, 0) are recorded, and the M1 area of one image data recording area contains the parameters of image n (for example, the image's The M2 area records the encoding parameters (quantization table and encoding table storage contents) of the image n, and the M3 area records the encoded image data.

When reproducing an image recorded on the memory card 8, first, the terminal 6g of the switch 6 is selected, and the image parameters such as the creation date recorded in the M1 area of the memory 8 are transferred to the system control circuit. 11, and then the selector switch 6 is switched to connect the terminals 6a, 6b.
, 6e, 6f are selected, and the encoding parameters read from the M2 area of the memory card are stored in the respective tables 55, 54.
, 58, 59. Further, the image data read from the area M3 of the memory card 8 is supplied to the encoding/decoding circuits 53 and 57 via the card interface 7, through the terminals 6c and 6d of the changeover switch 6. The DC coefficient data and AC coefficient data decoded and dequantized by the encoding/decoding circuits 53 and 57 and the quantization/inverse quantization circuits 52 and 56, respectively, are inversely orthogonally transformed by the DCT/IDCT circuit 51. , normally, each block is stored in the frame memory 3 via the changeover switch 4 whose terminal 4a is selected. The frame memory 3 reads each image data in a sequence indicated by X in FIG. 8 based on the address signal from the memory control circuit 14 and sends it to the D/A converter 2. The D/A converter 2 converts the digital data from the frame memory 3 into an analog signal and outputs it to a monitor system for display.

Now, when reproducing a reduced image as in the case of generating a multi-screen, the switch 10 is closed and the selector switch 4 is set to the terminal 4b side.
The reduced image data (DC coefficient data) read from the specific area of the memory card 8 shown in FIG.
(without passing through the buffer 9) and sends it to the quantization/inverse quantization circuit 52. The DC coefficient data dequantized by the quantization/dequantization circuit 52 is stored in the frame memory 3 via the terminal 4b of the changeover switch 4. This operation is repeated for each image (block image), read out in a sequence corresponding to one screen (X in FIG. 8A), converted into an analog signal by the D/A converter 2, and output.

In the above embodiment, when generating a multi-screen, it is only necessary to read the DC coefficient data from a specific area of the memory card, and there is no need to read the entire recording area data as in the conventional case, and the data is stored on the magnetic disk. When recording, the movement of the magnetic head can be minimized. Furthermore, since there is no need to perform inverse transformation processing (IDCT processing), multiple screens can be generated at high speed. Furthermore, if the switching order of the changeover switch 6 is changed and the reduced image data and image parameters (creation date, etc.) are recorded in the same area as shown in FIG. They can be referenced at the same time, further improving searchability. Also,
At the time of recording, the information amount of the reduced image can be compressed by applying the encoding used when recording the original image to the reduced image obtained by combining the DC coefficients. Data obtained by encoding this reduced image is recorded on a recording medium, and when generating a multi-screen for searching, the data of each image recorded in this way is read out and decoded. When played back, you get a multi-screen that combines each image. Since the decoding process is performed on the reduced image in this way, the multi-screen generation processing time can be significantly shortened, and since the amount of information is compressed, the recording area can be saved. Furthermore, it is clear that conventional horizontal and vertical filters are no longer required.

FIG. 5 is a block diagram showing another embodiment of the image recording/reproducing apparatus according to the present invention. In the figure, Figure 1
Components given the same reference numerals as in the figure indicate components having similar functions. In this embodiment, A/D converter 1
and the frame memory 3 and the DCT/IDCT circuit 51
A changeover switch 15 is provided to select and connect between the output side of the frame memory 3 and the frame memory 3, and the buffer 9 and switch 10 of FIG. 1 and their related parts are omitted. In this example, DCT/
By quantizing and encoding the DC coefficients obtained by the IDCT circuit 51 and recording them in the frame memory 3 in parallel, an image obtained by reducing the input image is recorded in the frame memory 3, and the input image is In this example, after the encoding process is completed, the reduced image generated by collecting the DC coefficients is encoded in the same way as the input image and recorded on the card.

More specifically, first, selector switch 15
, the terminal 15a side is selected, and digital image data from the A/D converter 1 is recorded in the frame memory 3. From the time when block data is read from the frame memory 3 and supplied to the DCT/IDCT circuit 51, the terminal 15b side of the changeover switch 15 is selected. Figure 1
Similarly to the embodiment, the DC coefficient data and AC coefficient data obtained by the DCT/IDCT circuit 51 are quantized by quantization/inverse quantization circuits 52 and 56, respectively, and encoded by encoding/decoding circuits 53 and 57. After being encoded, the data is recorded on the memory card 8 via the terminals 6c and 6d of the changeover switch 6 and the card interface circuit 7. Also, DCT/IDCT
The DC coefficient data obtained by the circuit 51 is transferred to the changeover switch 1.
The input image is recorded in the frame memory 3 via the terminal 15b of 5 as image data equivalently reduced from the input image. After the encoding process of the input image by the encoding unit 5 is completed and all data is recorded on the memory card 8, the aforementioned image parameters and encoding parameters are written (recorded) on the memory card 8, and then the frame memory 3 The reduced image data (consisting of DC coefficient data) recorded in is read out, the read data is encoded in the same manner as the input image is encoded to compress the amount of information, and is recorded on the memory card 8. As a result of the above processing, data obtained by encoding an input image and data obtained by encoding a reduced image are recorded in the memory card 8 in the arrangement shown in FIG.

In this embodiment, during normal playback, FIG.
The parameters of the image n of the card interface circuit 7,
System control circuit 1 via terminal 6g of selector switch 6
1, and the encoding parameters are sent to each table 54 through terminals 6b, 6a, 6e, and 6f of the changeover switch 6.
55, 58, and 59, and the similarly encoded image data is read out, and is subjected to decoding, inverse quantization, and inverse orthogonal transformation processing in the encoding unit 5 corresponding to DC component data and AC component data. and recorded in the frame memory 3. On the other hand, during multi-screen generation, the image parameters, encoding parameters, and encoded data of the reduced image are read out from the reduced image data part in FIG. The data is processed and written to the frame memory 3. If such processing is performed for each reduced image data of each image, a plurality of reduced image data can be obtained, making it possible to generate multiple screens.

In this embodiment, since the reduced image is encoded and recorded using the same method, the data recording area used for multi-screens can be saved. Also, similar to the embodiment shown in FIG. 1, high-speed processing is possible. In addition, in the operation of the configuration shown in FIG. 5, DC coefficient data is written only once for each block, and it is written to an address that has already been read, so there is no problem of duplication of the write address and read address. do not have. In the above embodiment, if an orthogonal transform other than DCT is used, such as a discrete Fourier transform, which can obtain coefficients representing the DC component within a block, the image size can be reduced and high-speed multi-screen processing can be performed. It is possible to generate

[0025]

[Effects of the Invention] As explained above, the image recording/reproducing device and the method according to the present invention combine DC coefficient data of orthogonal transformation data of input image data into a specific area separate from other orthogonal coefficient data. When obtaining a reduced image for multi-screen generation, it is only necessary to read out the DC coefficient data for each block from this specific area, eliminating the need for inverse orthogonal transformation processing and enabling high-speed multi-screen generation. It becomes possible. Furthermore, when a magnetic disk is used, high-speed searches are facilitated because the head movement for reading the necessary data only needs to be in a specific area (head movement can be minimized). Furthermore, since the DC coefficient data corresponds to the average value of the image within the block, it is equivalent to using horizontal and vertical filters, so the filter can be omitted, and additional frame memory unlike conventional methods is not required. This simplifies the configuration. In addition, the number of pixels of the image to be recorded, etc.
Since image parameters can be referenced together during multi-screen playback, image retrieval performance is improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of an image recording/reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a data transition state of multi-screen generation in the embodiment of FIG. 1;

FIG. 3 is a diagram showing data recorded on a memory card in the embodiment of FIG. 1;

FIG. 4 is a diagram showing another example of data recorded on a memory card in the embodiment of FIG. 1;

FIG. 5 is a configuration block diagram showing another embodiment of the image recording/reproducing apparatus according to the present invention.

FIG. 6 is a diagram showing data recorded on a memory card in the embodiment of FIG. 5;

FIG. 7 is a configuration block diagram showing an example of a conventional image recording/reproducing device.

8 is a diagram showing a data transition state when a multi-screen is generated by the conventional device shown in FIG. 7; FIG.

[Explanation of symbols]

1 A/D converter 2 D/A converter 3 Frame memory 4, 6, 15 Selector switch 5
Encoding unit 7 Card interface 8 Memory card 9 Buffer 10 Switch 11 System control circuit 12 Operation unit 13 Encoding control circuit 14 Memory control circuit 51 DCT/IDCT circuit

Claims (4)

[Claims] 1. One screen digital image data is divided into a plurality of blocks, and orthogonal coefficient data obtained by performing orthogonal transformation processing on the image data of each divided block is recorded in a first area of a recording medium, and An image recording method characterized in that only DC component data of the orthogonal coefficient data of the plurality of blocks is collectively recorded in a second area different from the first area. 2. At the time of reproduction, the method according to claim 1 reads the DC component data for each block of each screen of a plurality of screens from the second area of the recording medium in which the orthogonal coefficient data is recorded, and arranges the DC component data for each block. An image reproduction method characterized by reducing images and displaying them simultaneously. 3. One-screen digital image data is divided into a plurality of blocks, and orthogonal coefficient data obtained by performing orthogonal transformation processing on the image data of each divided block is recorded in a first area of a recording medium, and the A first mode in which only DC component data among orthogonal coefficient data of a plurality of blocks is collectively recorded in a second area different from the first area, and data in the first area is read out during playback. , a second mode in which an image is reproduced by performing inverse orthogonal transformation, and a process of reading out the DC component data from the second area and arranging them as one pixel to reduce the image, for each recorded image. an image recording/reproducing apparatus, comprising: a third mode in which a multi-screen is generated; 4. Divide one-screen digital image data into a plurality of blocks, and record orthogonal coefficient data obtained by performing orthogonal transformation processing on the image data of each divided block in a first area of a recording medium, and The DC coefficient data is extracted from the orthogonal coefficient data of each block to generate a reduced image as one pixel, the obtained reduced image is divided into blocks again, and the divided block data is orthogonally transformed and encoded. An image recording method, characterized in that data obtained through processing is recorded in a second area different from the first area.