Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-10-07
1994-02-01
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
3582612, 358430, 358433, 348420, 348437, H04N 141, H04N 1415, H04N 712
Patent
active
052836568
ABSTRACT:
A data compression apparatus for video data having: a dividing circuit for dividing the video data into unit blocks, a converter for orthogonally converting the video data at each of unit blocks, a quantizer for quantizing the orthogonally converted video data, and a coder for run-length-coding the quantized video data, comprises: a first detector for detecting powers of the video data in the horizontal and vertical directions within given bandpasses respectively; a second detector for detecting a difference between the powers; and a controller for controlling the amount of coded data produced by the run-length-coding in accordance with a total of the powers and the difference. This apparatus controls the amount of coded data in accordance with power of input video data and difference between powers of video data of the horizontal and vertical directions. A method for compressing input video data is also disclosed.
REFERENCES:
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"ISO Adaptive Discrete Cosine Transform Coding Scheme For Still Image Telecommunication Services"; published by ISO/TC97/SC2/WG8-ADCTG: Jan. 25, 1988; pp. 14-17.
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Hiroshi Yasuda, "Color still picture coding international standarization", Journal of the institute of image electronics engineers of Japan, vol. 18, No. 6, 1989, pp. 398-407.
Coles Sr. Edward L.
Rogers Scott A.
Victor Company of Japan Ltd.
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