| 摘要 |
Image coding having high coding efficiency is provided with a small computational complexity by properly determining a prediction mode and a quantization parameter. When an image is coded by a prediction mode selected from plural prediction modes every any coding unit, an undetermined multiplier lambda is first calculated from a quantization parameter (function S 301 ) Subsequently, the cost of each of R-D points (pairs of number of coded bits and coding distortion that correspond to plural combinations of prediction modes and quantization parameters) is calculated (function S 305 ) on the basis of the undetermined multiplier lambda while generation and estimation of the R-D points and deletion of the points (functions S 302 -S 304 ) are repeated every coding unit, for example, every macroblock, and the optimal combination of the prediction mode and the quantization parameter is determined on the basis of the R-D point providing the minimum cost.
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