JPS62117081A - Picture recording and reproducing method - Google Patents

Abstract

PURPOSE:To shorten the retrieving time when the prescribed picture is retrieved while many recorded pictures are displayed on a monitor by discriminating the contents of the picture before the whole of one screen is reproduced. CONSTITUTION:The picture signal is quantized to plural bits at the prescribed sampling frequency, the quantizing code of all picture elements is successively recorded in a lump for respective digits, the quantizing code of all recorded picture elements is successively read from the higher order bit for respective digits, and after the reading of respective digits is completed, the picture is reproduced based on the quantizing code read until then. Thus, by the picture by the quantizing code of the highest order digit or the picture by the quantizing code of two higher order digits, the contents of the stationary picture can be sufficiently discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application a) The present invention relates to a method for recording and reproducing still images, and particularly to an image recording and reproducing method that reduces search time.

(Conventional Technique WI) Conventionally, image recording and reproducing devices that record a large number of still images in an image file, search for image information recorded in the image file, and reproduce a desired still image have been widely put into practical use. This image recording and reproducing device uses an A/D converter to quantize the image signal for each pixel at a predetermined sampling frequency and convert it into a multi-bit digital signal, and converts this digital signal into a memory device such as a disk memory. The digital signal is sequentially recorded for each pixel, and when reproduced, the recorded digital signal is sequentially read out for each pixel, subjected to D/A conversion, and supplied to a display device to reproduce a still image.

(Problems to be Solved by the Invention) In the conventional image recording and reproducing apparatus described above, the digital signal of each picture element is read out from the memory device for each IB element, and the
Since the configuration is such that the image signal is reproduced after image conversion, it takes a long time to complete the conversion of all the pixels that make up one screen, and therefore it takes a long time from the start of readout until the image is actually displayed. ◇For this reason, when trying to search for a desired still image, it is not possible to determine whether or not it is the desired image until all pixels that make up the still image have finished playing, resulting in a long search time. There was a drawback.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image recording and reproducing method that eliminates the above-mentioned drawbacks and allows searching in a short time.

(Means for solving the problem) Kinoi [The image recording and reproducing method by UJ quantizes the image signal into multiple bits at a predetermined sampling frequency, and sequentially records the quantization codes of all pixels for each digit. The quantization code of all the recorded pixels is sequentially read out from the upper bit for each digit.11 After the reading of each digit is completed, the image is reproduced based on the quantization code read so far. It is something to do.

(Function) In this way, if the recorded quantization codes of all pixels are sequentially read out from the upper bit for each digit, and after the reading of each digit is completed, the image is reproduced based on the quantization code read so far. Image with quantization code of the most significant digit or the top two
The content of a still image can be sufficiently determined based on the image with the digit quantization code, and the content can be determined before reproducing all the quantization codes of the still image. The search time for searching for still images is reduced.

〔Example〕

FIG. 1 is a diagram showing an example of a circuit configuration for carrying out the image recording and reproducing method according to the present invention. An image signal representing a still image is input to a converter 2 via an input terminal 1. Since the input image signal is an analog signal, the A/Dv converter 2
is converted into a multi-bit quantization code at a predetermined sampling frequency. In this example, it is assumed that the code is converted to an 8-bit quantization code, and the sampling frequency for quantization is 1.0.78MHz t-1a, 5MHz, 14
．． a It can be set to various frequencies such as IMHz. A
An input frame memory 8 is connected after the /D converter 2. This input frame memory 8 has eight memory sections 8a,
δb, ao.

It is divided into ad, ae, 8ft, 8g, and ah, and the code of the most significant digit (MSB) of each pixel is input into the memory section 8a, the code of each digit is input into each section sequentially, and the code of each pixel is input into the memory section 8h. Enter the code of the least significant digit (LSB) of the pixel. Therefore, each code covering the most significant digit of each pixel is simultaneously stored in the memory sections 3a to 8h corresponding to the frame memory 3, respectively. When the quantization by the A/D converter 2 is completed, the selector circuit 4 selects the codes stored in each memory section 8a to 3h of the frame memory 8 from the memory section aa where the :I-code of the highest order i is stored. The codes of the lower digits are sequentially output to the memory device fi5 and stored up to the memory section 8h. Incidentally, the output to the memory device w15 is performed by counting up the control signal supplied from the central control unit to the selector circuit 4 every time data transfer for each memory section of the frame memory 8 is completed.

In this way, recording of one still image is completed, and the memory device stores the 8-bit code of all pixels divided into each digit, that is, the most significant digit column of each pixel, then the second bit code. Column N''---9 are stored sequentially as a column of least significant digits.

Next, the process of reproducing the information stored in the memory device 5 will be explained. Output cuff 1z-A to memory device 5
Connect Memo IJ6. This output frame memory 6 is also 8
memory sections 6a to 6h, and each memory section 6a to 6h is connected to a memory device w, 5, respectively.

The code of the most significant digit of each pixel is continuously written into the memory section 6a, the code of the second bit is continuously written into the memory section 6b, and the information of each bit is sequentially written.
The code of the least significant digit of each pixel is successively written into the memory section 6h. Then, one still image is completely transferred to the output frame memory 6 by writing the code of the least significant digit. Note that writing control of the output frame memory 6 is performed for each memory section 6a to 6a of the output frame memory 6.
The input to the defooder circuit 7 connected in parallel to 6h is performed by counting up by one each time the storage operation in each memory section is completed. A D/A converter 9 is connected to the downstream of the output frame memory 6 via a gate group 8 consisting of eight gates 8.a to 8h. Each game) 8a to 8h is arranged in parallel, and the corresponding memory sections 6a to 6 of the output frame memory 6 are arranged in parallel.
Connect to h respectively. That is, the output of the memory section 6a in which the ridge/higher digit code is stored is sent to the first gate sa.
The output of the memory section 6b is connected to one input terminal of the second gate (81), and the output of the memory section 6h which is connected sequentially to store the code of the lowest digit is connected to the eighth Connect to one input terminal of 8h. Also,
The other input terminal of each gate 8a to 8h is cleared by a shift register, and then shifted one by one each time writing to each memory section is completed. Therefore, when the writing operation of the code of the most significant digit of each pixel to the memory section 6a is completed, a bit signal of, for example, 1ooQOOOO is supplied from the shift register 10 to the other input terminal of each game 8a to 8h, and the memory section The code of the most significant digit of each pixel written in 6a is passed through the first game) 8a to D/
It is output to the A converter 9, and an image signal based only on the most significant digit code is formed at the output terminal 11. In other words, this image signal is a binary image signal based on the most significant digit code, and is sliced based on whether or not it exceeds the intermediate level based on the most significant digit code. will be completely lacking in midtones. In many cases, it is possible to judge the content even when this midtone level is missing,
It is possible to perform a sufficient search using an image with only the most significant digit. Next, when the writing of the second bit code to the memory section 6b is completed, each game) 8a to 8b is filled with, for example, 1 bit.
A bit signal of 1,000,000 is supplied from the shift register 10, and the most significant digit and second bit code of each pixel written in the memory sections 6a and 6b are passed through the first gate and the second gate to the D/A converter 9. An image signal is formed at the output terminal 11 using only the code of the most significant digit and the second bit. When the upper two bits are added, the image level becomes four and the brightness increases to 75%, so there are almost no images whose contents cannot be distinguished. In this way, the lower bits are sequentially output, and the reproduction ends when the output of the least significant bit is completed. Normally, it takes about 0.5 seconds to read one still image from the memory device, but it takes about 1/2 second to read out one still image from the memory device, but it takes about 1/2 second to read out one still image from the memory device.
8, it takes about 0.06 seconds, and if it is an image up to the upper two bits, it takes about 1/4 of the time, about 0.12 seconds. Therefore,
Since the content can be determined sufficiently with an image signal based on only the most significant digit or only the upper two bits displayed on the display device, it is possible to search for a desired image while displaying a large number of recorded images on a monitor. In this case, it is possible to shorten the search time.

FIG. 2 is a diagram showing NTSO signals and quantization levels. In this example, the bit code at the pedestal level is 0011.
1100, and the bit code of 100% white is 1100
Quantize to 0000 0 In this case, if the bit code is oooooooooo, it will be -42.9%, and if the bit code is 11111111, it will be 18g・8%) B) If the code is 10000000, it will be 48.2%
Therefore, it can be determined sufficiently.

(Effects of the Invention) As explained above, according to the present invention, the quantization codes of all pixels are collected for each digit and recorded sequentially from the upper bit, and the recorded quantization codes of all pixels are recorded for each digit of the upper bit. Since the structure is such that the bits are sequentially read out and the image is reproduced based on the quantization code that has been read out after each digit has been read out, the content of the image can be determined before the entire screen is reproduced. It is possible to shorten the search time when searching for a desired image while displaying recorded images on a monitor.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a circuit configuration for carrying out the image recording and reproducing method according to the present invention, and FIG. 2 is a diagram showing NTSO signals and quantization levels. 1... Input terminal 2... A/D converter 8.
...Input frame memory 4...Selector circuit 5...
・Memory device 6...Output frame memory...Decoder circuit 8...Gate group 9...D
/A converter 10...Shift register 11...
・Output terminal

Claims (1)

[Claims] 1. Quantize the image signal into multiple bits at a predetermined sampling frequency, record the quantization codes of all pixels sequentially for each digit, and sequentially record the quantization codes of all pixels for each digit starting from the most significant bit. After reading out each digit,
An image recording and reproducing method characterized in that an image is reproduced based on the quantization code that has been read so far.