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    • 28. 发明专利
    • ENCODING SYSTEM
    • JPH01132276A
    • 1989-05-24
    • JP31707787
    • 1987-12-15
    • SANYO ELECTRIC CO
    • NAKAJIMA HISAHARUHAYAZAKI HIROYUKISAITOU YOSHINORIMATSUYAMA HISASHI
    • H04N1/41H04N1/413H04N1/417
    • PURPOSE:To make picture information into more compressed one by allotting a special compressed code to a part having the same density value as the density value just above or just before. CONSTITUTION:The data of a first lateral one line portion is stored from a video memory 3 in a buffer memory 6, and a synchronizing signal SYN, a flag F and a PCM code to show the density of 4 bits are transmitted by one line portion. Then, the next one line is read out from the video memory 3 in the buffer memory 6, and for the picture element part having the same density value as the picture element of the above line, the compressed code of '1' is allotted, and when the density value is different from the above picture element, it is compared with the density value of the picture element just before the picture element to be encoded, and if the same, the compressed code of '01' is allotted. Because usually, the picture like the face of a man has strong correlative relation in the picture elements in upper, lower, right and left sides, and the density does not change largely in the picture elements in every direction, the picture information can be made into the more compressed one.
    • 29. 发明专利
    • CODING SYSTEM
    • JPS6441572A
    • 1989-02-13
    • JP19843287
    • 1987-08-07
    • SANYO ELECTRIC CO
    • MATSUYAMA HISASHIHAYAZAKI HIROYUKISAITOU YOSHINORI
    • H04N1/41
    • PURPOSE:To compress image information by comparing a picture element shown by an (n) bit with the density value of the picture element before it, allocating, when a density difference is shown by an (m) bit smaller than the (n), the density deference shown by the (m) bit and allocating the density value of the (n) bit in other cases. CONSTITUTION:An image fetched by a CCD camera 1 has the density value of 16 gradations in which one picture element is shown by the PCM code of 4 bits as a half tone, and the image is composed of the 90X90 elements. For a first (a head) picture element of one line, the density value is made into zero, and the difference from the density value of a second picture element is obtained. When the density difference is within + or -3, a prescribed compressing code corresponding to the density difference is added. When the density value is above + or -3, a prescribed identifying code, which indicates that the 4 bits are the PCM code, and the PCM code of such a density value are allocated. In such a way, the data of the portion of one screen are compression-coded and sent.