Image information code processing system

Details Image information code processing system Image information code processing system

1988-03-25

1992-05-12

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358433, 358456, G06K 936

Patent

active

051134578

ABSTRACT:
An image information code processing system in this invention compresses and encodes a 2-valued image information in a facsimile, etc. For example, an image is expressed by a set of component patterns using bit patterns of divided 4.times.4 bit rectangular blocks, and a codeword train of matched codewords of the component patterns are determined as a block code. In this system, using a four times expanded block process, one block code of the expanded block is determined, then the system expands to determine a partial pattern of three other blocks. A division mark located between the codewords of a codeword train can be abbreviated where a special condition exists between adjacent codewords. Further shortening can be obtained by coding wherein a prediction pattern is obtained and in which only a portion of a real pattern is different from the prediction pattern is encoded. As a result, the 2-valued image information is compressed and the 2-valued image information can be transmitted and processed with a higher efficiency.

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Hunter, Roy and Robinson, A. Harry: "International Digital Facsimile Coding Standards", Proc. IEEE, vol. 68, No. 7, pp. 854-867 (Jul. 1980).
Enomoto and Choud: "Coding of graphics by using prime implicant representation" Picture Coding Symposium, Tokyo Institute of Technology (1984).

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