Image analysis – Image compression or coding – Lossless compression
Patent
1995-06-07
1997-05-06
Boudreau, Leo
Image analysis
Image compression or coding
Lossless compression
358432, G06K 936, G06K 946
Patent
active
056279175
ABSTRACT:
A variable length coder is disclosed having a zig-zag FIFO that is supplied with coefficient blocks prior to encoding. The zig-zag FIFO has a comparator for comparing each coefficient of each coefficient block with zero. The zig-zag FIFO also has a counter responsive to the comparator. The counter increments a count therein by one for each received zero AC coefficient of each run, i.e., each continuous sequence, of zero AC coefficients contained in each block. The zig-zag FIFO also has a FIFO circuit which is responsive to both the comparator and counter. The FIFO stores each DC coefficient and each non-zero AC coefficient of each zig-zag scanned block in the order in which they are received. The FIFO also stores the count of the counter (i.e., the zero run length) for each run of zero AC coefficients in the order in which the run appears in the zig-zag scanned block of coefficients.
REFERENCES:
patent: 5341318 (1994-08-01), Balkanski et al.
patent: 5402244 (1995-03-01), Kim
patent: 5440404 (1995-08-01), Okamoto
patent: 5475502 (1995-12-01), Lee et al.
Boudreau Leo
Industrial Technology Research Institute
Mehta Bhavesh
LandOfFree
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