Patent ID: 9271001
Filing Date: 2016-02-23
CPC Classification: H04N

Claim Text:
1. An image coding apparatus comprising: a processor; and a memory; wherein the processor performs prediction for an input image stored in the memory to generate prediction errors; wherein the processor performs orthogonal transform to the prediction errors to generate transform coefficients; wherein the processor quantizes the transform coefficients using a quantization matrix to generate quantization coefficients; wherein the processor codes a difference value between a first coefficient and a second coefficient, the first coefficient and the second coefficient are two of a plurality of coefficients in the quantization matrix; wherein the processor codes the difference value into a code with less number of bits in case where the difference value is a positive value than a number of bits in case where the difference value has the same absolute value as the absolute value of the positive value while the difference value is a negative value; and wherein the processor stores the difference value using the code in the memory.