CODING RATE CONVERTING APPARATUS, INTEGRATED CIRCUIT, AND METHOD, AND PROGRAM FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To suppress deterioration in picture quality due to rate conversion, and increase coding efficiency.

SOLUTION: A coding rate converting apparatus 100 according to the present invention comprises: an inverse quantization unit 106 generating orthogonal transform coefficients by inversely quantizing first quantized data for each of unit blocks; a quantization unit 107 generating second quantized data by quantizing the orthogonal transform coefficients using a second quantization step size; a filter intensity change judging unit 108 judging whether a second filter intensity determined based on the second quantized data is changed from a first filter intensity determined based on the first quantized data; and a coefficient correcting unit 109 generating, in the case that the second filter intensity changes from the first filter intensity, third quantized data by correcting the second quantized data so that a third filter intensity determined based on the third quantized data becomes equal to the first filter intensity.

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