Patent ID: 9167244
Filing Date: 2015-10-20
Classification: H04N

Abstract:
1. A coding apparatus comprising: a transforming unit that transforms image data corresponding to a target block including in an image into transformed data, wherein a size of the target block is selected from different sizes; a controlling unit that (a) determines a minimum value to be assigned to the target block in accordance with the size of the target block, (b) adjusts a quantization step size of the target block not to fall below the determined minimum value, and (c) adjusts a quantization step size of another block whose quantization step size exceeds a minimum value assigned to the another block to be closer to the minimum value assigned to the another block so that a code amount of the another block is increased; a quantization unit that quantizes the transformed data using the adjusted quantization step size of the target block to generate quantized data; and a coding unit that codes the quantized data.