| 摘要 |
An image coding apparatus configured to support a coding scheme capable of selecting a size of a block to be coded from a plurality of sizes includes a quantization unit configured to assign a quantization step size to each block of an image to be coded and quantize each block, a coding unit configured to code image data relating to each block quantized by the quantization unit, a minimum quantization step value setting unit configured to set a minimum quantization step value according to the size of each block and apply the minimum quantization step value to each block of the image to be coded, and a quantization step determination unit configured to determine the quantization step size of each block not to fall below the minimum quantization step value thereof.
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