JPS6053388A - Picture signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain retrieval by a shrinked picture by sampling a picture signal in an equal picture element interval so as to split the signal into N blocks and constituting the device that the signal is recorded onto a recording medium possible for random access. CONSTITUTION:In splitting an original picture A into, e.g., four blocks and recording them, the original picture image A is split into small blocks comprising four picture elements 1-4 at first. Then picture elements of the same number are collected from each small block so as to constitute blocks A1-A4. That is, the same signal as the original picture signal shrinked into 1/4 is obtained. The picture signal obtained in this way is recorded to the recording medium possible for random access at each block. In reproducing the picture signal from the signal recorded in this way, when the blocks, e.g., A1-A4 are all reproduced, the original picture signal A is reproduced completely. In reproducing only the block A1 on the other hand, the picture signal shrinked into 1/4 is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applied to an image file device that records image signals such as color television signals on a large-capacity recording medium, and displays necessary image signals on a display for retrieval. The present invention relates to a possible image signal recording and reproducing device.

5. Configuration and Problems of Conventional Example When image signals recorded on a large-capacity recording medium are reproduced one after another and displayed on a reproduction ν display to check the signal contents, the method of reproducing all one image signal requires image display 1. For example, in Figure 1 a, b, d, e.
The conventional method is to create an image signal C by reducing each of the four image signals shown in %, and to reduce the time required for image display by reproducing these reduced image signals one after another during playback. This is an example.

In this case, it is necessary to record an image signal formed by reducing a plurality of image signals separately from the original image signal, which reduces the efficiency of use of the recording medium.

OBJECTS OF THE INVENTION The present invention is capable of recording, for example, the first
It is an object of the present invention to provide an image signal recording and reproducing apparatus capable of obtaining an image signal as shown in FIG.

Structure of the Invention The present invention includes an image memory, a randomly accessible recording medium, a first storage means for encoding an input image signal and storing it in the image memory, and a first storage means for encoding an input image signal and storing it in the image memory. a first readout unit that divides the image into a plurality of blocks each consisting of +71×n pixel signals sampled at intervals, and sequentially reads out image signals for one image from each block from the image memory; recording means for recording the read image signal on the recording medium; and reproducing at least one recorded image signal block for each area from a plurality of image signal recording areas of the recording medium, or from one image signal recording area. reproduction means for reproducing all the image signal blocks; second storage means for storing the reproduced image signal blocks in the image memory; and second storage means for reading out the stored image signal block C1 from the image memory. This is an image signal recording and reproducing device equipped with reading means, which divides an input image signal into blocks consisting of m x n pixel signals sampled at equal pixel intervals for each image signal, and Since I recorded it in , when playing back,
By selecting only blocks that represent a plurality of video signals, it is possible to speed up the search.

Description of examples The principle of the present invention will be briefly explained.

FIG. 2 shows an example in which the original image A is divided into four blocks and recorded. Original image A shown in Figure 2a
is divided into small blocks each consisting of 2×2=4 pixels as shown in the figure. /JS block is 1.2,3.
It is composed of four pixels of 4. Next, pixel 1 is collected from each small block to form block A1, pixel 2 is collected to form block A2, and so on, block A3. Configure A4. That is, as shown in FIG. 2C, one image A consists of four blocks A1. A2. A3. It was divided into A4 sheets,
The image signal of each block is composed of ypt x n pixel signals obtained by sampling the original image signal at equal intervals of the number of pixels, and is the same signal as reduced to %.

The image signal divided into four blocks as described above is recorded block by block on a randomly accessible recording medium. FIG. 2d shows four image signals A.

This shows a signal format in which B, C, and D are each divided into four blocks and recorded on a recording medium.

When reproducing image signals from signals recorded in this way,
For example, block A1. A2. A3. If all of A4 is reproduced, the original image signal will be completely reproduced, and if only block A1 is reproduced, an image signal with the original image signal reduced to % will be reproduced. Therefore, if block A1 shown in FIG. 2d is reproduced from a randomly accessible recording medium, then blocks B1, C1, and D are sequentially reproduced and stored in the image memory, the block shown in FIG. Images A, B, C, and D are each reduced to numbers and stored in an image memory so that they can be displayed in the form of an arrangement.

The above description has been given of the case of reduction to Z, but an example of reduction to % is shown in FIG. In Figure 3, the aforementioned small block is composed of 4x4=16 pixels, and the pixels 6 of each small block are collected to form block A6, the pixels 6 are collected to form block A, and so on to form block A7゜...'' 20 .

Blocks configured in this manner are recorded on a recording medium in the order shown in FIG. 3, for example. As in the previous example, KA
When reproducing from only A51A71A13'''16, an image is obtained in which the original image is reduced to %.For example, when reproducing from only A51A71A13'''16, an image is obtained by reducing the original image to %.

If the original image is an NTSC television signal, in which a color signal is multiplexed on a brightness signal, the NTSC signal is separated into a brightness signal and a color signal, and an image memory for the brightness signal and an image memory for the color signal are stored respectively. All you have to do is memorize it. Next, as described above, the luminance signal and the color signal may each be divided into N blocks, and each block may be sequentially stored on the recording medium.

Also, when the image is the three primary color signals R, G, and B, the image signals are stored in the R image memory, the G image memory, and the B image memory, and each of the three primary color signals is divided into N blocks as described above. It is sufficient to divide the data into blocks and sequentially store each block on a recording medium.

FIG. 4 is a block diagram showing a black and white television signal recording and reproducing apparatus according to an embodiment of the present invention.

The camera 21 receives a composite synchronization signal 3 from a synchronization signal generator 34.
It is driven by 6. The output signal of the camera 21 is band-limited by a low-pass filter (LPF) 22 to prevent aliasing distortion, and then encoded by an A/D converter 23. The A/D converter 23 is driven by a sampling clock 36 from a synchronization signal generator 35. The output signal of the A/D converter 36 is stored in the image memory 24. The image signal stored in the image memory 24 in this way is applied to the image memory 24 via the address switching circuit 30 with the output signal of the address counter 131 which operates based on the output signal of the synchronizing signal generator 34 and performs address reffing at intervals of equal number of pixels. Depending on the circumstances, the data may be read out in the order shown in FIG. That is, the operation of sequentially reading out the pixel 1 of the small block shown in FIG. A3
．． A4 image signals are obtained one after another. A double image signal is recorded in the disk memory 25, which allows random access to the image signal thus obtained, in the signal format shown in FIG. 2d.

When reproducing the image signal A recorded in the disk memory 25 at the original signal size, recorded image signal blocks A1 to A4 are sequentially reproduced from the image signal recording area of the disk memory 25 under the control of the disk controller 29. Address reffing of the image memory 24 is performed using the output signal of the address counter I31, and blocks A4 to A4 are stored in the image memory 24. Since blocks A1 to A4 are sequentially reproduced and addressing is performed at equal pixel intervals by the address counter 131, the image signal A is stored in the screen memory 24 as shown in FIG. 2d.

The signal stored in the image memory 24 is read out using the output signal of the address counter 132, converted to an analog signal by the D/A converter 26, and is applied to a low-pass filter 27 to remove aliasing components, and the output is displayed on the display. Displayed on 28.

From the disk memory 25 recorded in the signal format as shown in FIG.
A case will be described in which blocks B, C1 and Dl are successively reproduced. When the block tag is reproduced from the disk memory 26, the image memory 24 is operated by the output signal of the address counter 33, and the image signal of the block A1 is stored in the image memory 24 at the addresses corresponding to the eight C in Figure 1. do. Similarly, Pro, RiB1. C1 and Dl are sequentially reproduced from the disk memory 26, and the first
B1 in Figure C. Each image signal is stored in an address corresponding to C1 and Dl. If different image signals are to be reproduced further, the image signals from A1 onwards in FIG. The image signal may be stored in the address corresponding to .

The overall control of recording and playback as described below is carried out by the CPU 37, such as a microprocessor, and by the disk controller 29. This is done by controlling the image memory controller 38 and address switching circuit 3o.

Reading and writing from the image memory 24 is controlled by an image memory controller 38, and recording and reproduction from the disk memory 2f5 is controlled by a disk controller 29.

Effects of the Invention In the present invention, 1. Since the image signal is sampled at equal pixel number intervals and divided into N blocks and recorded on a randomly accessible recording medium, if one blow is reproduced, It is possible to reproduce an image reduced to 1/N, and use the reduced image to efficiently search for a necessary image signal, and in particular, according to the present invention,
Compared to the conventional method, which had the redundancy of recording the reduced image signal separately from the original image signal, since there is no such redundancy, the utilization efficiency of the recording medium is high.

[Brief explanation of the drawing]

FIG. 1 is a pattern diagram showing the case where four image signals are reduced and stored in one image memory, and FIGS.
The figure is a diagram illustrating the principle of the present invention without further explanation, and FIG. 4 is a block diagram showing the configuration of an embodiment of the present invention. 23, A/D converter, 24... image memory, 25
Disk memory, 26. , , , D/A converter, 29
・Discontroller, 30. , -7 Tres switching circuit, 31 Address counter 1.32 Address counter 11.33, Address counter II 1.34 Synchronization signal generator, 38 Image controller. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure ((L) C'b) (riFigure 2 (Rautct)

Claims (1)

Scope of Claims: (1) an image memory, a randomly accessible recording medium, a first storage means for encoding an input image signal and storing it in the image memory; +++X obtained by sampling at equal pixel intervals
a first reading means for dividing into a plurality of blocks composed of n pixel signals and sequentially reading one image of image signals for each block from the image memory; a recording means for recording on a medium; and at least one recorded image signal for each area from a plurality of image signal recording areas of the recording medium; a reproduction means for reproducing a block; a second storage means for storing the reproduced image signal block in the image memory; and a second storage means for reading out the image signal block stored by the second storage means from the image memory. 1. An image signal recording and reproducing device comprising: reading means. ? ) The image memory includes an image memory for luminance signals and an image memory for chrominance signals, each of which encodes and stores a color television signal consisting of a luminance signal and a chrominance signal. Image signal recording and reproducing device. (3) A patent claim characterized in that the image memory includes an R image memory, a G image memory, and an R image memory that encode and store image signals consisting of R, 'G, and B three primary color signals. The image signal recording and reproducing device according to item 1.