| 摘要 |
An image coding apparatus includes a block dividing unit configured to divide an input image into a plurality of blocks a prediction unit configured to perform prediction based on coded pixels to generate prediction errors a transformation unit configured to perform orthogonal transform to the prediction errors to generate transform coefficients a quantization matrix generation unit configured to generate quantization matrices that are used to quantize the transform coefficients a quantization matrix coding unit configured to calculate difference values by scanning the quantization matrices and to code the difference values a quantization unit configured to generate quantization coefficients by quantizing the generated transform coefficients using the quantization matrices and a coefficient coding unit configured to code the quantization coefficients wherein the quantization matrix coding unit is configured to scan coefficients of the quantization matrices in a unidirectional manner to calculate the difference value. |
