Encoding apparatus, method of controlling thereof, and computer program

摘要

An encoding apparatus comprises, a detection unit configured to determine a characteristic of the image of each of a plurality of blocks and to detect whether visual degradation in each block is noticeable, a determination unit configured to determine a quantization parameter of each block based on a detection result, a transformation unit configured to perform orthogonal transformation of the block and quantization using the quantization parameter, an encoding unit configured to perform variable-length encoding of a transformation result, an inverse transformation unit configured to inversely transform the transformation result to generate a locally decoded image, and a calculation unit configured to calculate a reference value to change a criterion to determine the characteristic of the image, wherein the detection unit detects a block having noticeable visual degradation by changing the criterion in accordance with the reference value.

主权项

1. An encoding apparatus which divides an input image into a plurality of blocks and encodes the input image, comprising:
one or more processors; a memory; and a computer program including program codes stored in the memory, which, when executed by the one or more processors, causes the one or more processors to perform operations of: determining a characteristic of an image of each of the plurality of blocks and detecting a block in which visual degradation is noticeable, wherein the block to be detected includes at least one of an edge block and a skin color block; determining a quantization parameter of each block based on a detection result of the detection; performing transformation including orthogonal transformation of each block and quantization using the determined quantization parameter; encoding a result of the performed transformation; and changing a reaction parameter to determine the quantization parameter according to the proportion of detected blocks to entire blocks of the input image.