Image encoding apparatus, image encoding method, and recording medium in which image encoding program is recorded

Abstract

The block reducing unit reads one block out of each block group. The pixel reducing unit reads pixels on one-out-four basis. The block reading unit sequentially reads out images. The orthogonal transformation unit performs orthogonal transformation. The quantization unit performs a quantization. The encode amount predicting unit calculates predicted encode amounts. The quantization width calculating unit determines an optimum quantization width. The quantization table generating unit generates an optimum quantization table. The block-assignment encode amount setting unit calculates an encode amount to be assigned to each block.