Patent ID: 9667958
Date: 2017-05-30
CPC Classifications: H04N

Claim:
1. An image decoding apparatus, wherein the image decoding apparatus is configured to: perform entropy decoding on a received code stream to obtain image data and a quantization matrix, wherein the quantization matrix is a matrix reflecting image quantization step information, and the quantization matrix comprises an M*N quantization matrix; obtain a P*Q quantization matrix by scaling the M*N quantization matrix and by using a sum of a scaled matrix of the M*N quantization matrix and an M*N differential quantization matrix, and perform, by using the M*N quantization matrix and the P*Q quantization matrix, inverse quantization on the image data on which the entropy decoding has been performed; perform inverse transform on the image data on which the inverse quantization has been performed; and perform predictive compensation on the image data on which the inverse transform has been performed, so as to generate a decoded image.