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A 4-PIXEL CODE COMPRESSOR Disclosure Number: IPCOM000024449D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


The above rules apply where there is a maximum of 63 all-zero nibbles before the terminating nibble. If there are 64 or more all-zero nibbles before a non-zero terminating nibble, the data string is converted into a first part comprising a number of sets of 64 all-zero nibbles and second part comprising the remaining 0 to 63 all-zero nibbles and the terminating nibble. The first part is encoded into a type 3B output word of the form 1lnnnnnnOOOO where nnnnnn is the binary repre-sentation of the number of sets of 64 all-zero nibbles. The second set is then encoded according to the previously described rules.