Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-04-10
1991-12-03
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 375 27, H04N 712
Patent
active
050704028
ABSTRACT:
An image information transmission apparatus of this invention encodes and transmits image information. An image information signal of one frame consisting of a plurality of pixel data is divided into a plurality of blocks each consisting of a predetermined number of pixel data. At least two reference value data associated with a dynamic range of levels of the pixel data constituting each of the divided blocks, and distribution state data associated with a distribution state thereof are formed. Each pixel data constituting the block is encoded on the basis of the formed reference value data and the formed distribution state data to obtain encoded data. A transmission data series is formed and transmitted using the formed reference value data, the formed distribution state data, and the encoded data as transmission units. Therefore, the image information signal can be highly effectively transmitted with minimum image quality degradation caused by encoding.
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"Die Blockkompandierung digitaler Fernsehsignale", pp. 1-81 (Dissertation, Institute of Technology, Aachen), by Keesen, 5/22/84.
Fujii Akio
Ishii Yoshiki
Sasatani Tomohiko
Shimizu Tetsuya
Shimokoriyama Makoto
Canon Kabushiki Kaisha
Peng John K.
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