Patent ID: 9054734
Filing Date: 2015-06-09
Classification: H03M,H04L,H04N

Abstract:
1. A coding method for performing variable-length coding on two-dimensional coefficients of a block which are obtained by performing frequency transformation on picture data of the block that has a predetermined size of pixels, the method comprising: scanning the two-dimensional coefficients of the block in a predetermined order starting from a low frequency component toward a high frequency component so as to obtain scanned coefficients; performing variable-length coding on the scanned coefficients from a high frequency component toward a low frequency component using a plurality of variable length code tables; wherein each of the plurality of variable length code tables includes a plurality of variable length codes which correspond to the coefficients, wherein said performing variable-length coding comprises: wherein each of the first threshold value, the second threshold value, and the third threshold value is determined based on a rate of change in code length of the variable length codes included in each of the variable length code tables.