H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/26 (2006.01) H03M 7/40 (2006.01) H04N 7/30 (2006.01)
Patent
CA 2607755
According to the present invention, an image coding apparatus provides a run-length encoding unit RLE1 that subjects quantized coefficients which are obtained by quantizing frequency components of an image signal to a variable length coding process by using a run value Run that indicates the number of successive zero coefficients and a level value Lev that indicates a value of a non- zero coefficient following the zero coefficients. The run-length encoding unit RLE1 includes an reordering unit Lreodr for reordering level values Lev; a variable length coder LVLC for coding reordered level values ROLev by using a code table that is selected according to the value of a quantization parameter QP; a reordering unit Rreodr for reordering run values Run from high frequency component of the quantized coefficients to low frequency component; and a variable length coder RVLC for coding reordered run values RORun by using a code table that is selected according to the number of already-processed run values. Accordingly, a variable length coding process for quantized coefficients is carried out at a higher coding efficiency, with redundant information included in the coefficients being effectively reduced.
Abe Kiyofumi
Hagai Makoto
Kadono Shinya
Kondo Satoshi
Matsushita Electric Industrial Co. Ltd.
Osler Hoskin & Harcourt Llp
Panasonic Corporation
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