Patent ID: 7433541

Claim:
An image synthesizing apparatus for synthesizing an encoded code stream, the apparatus comprising: first and second image decoding means comprising: a code stream analyzing means for analyzing a first and second encoded code streams; a code block extracting means for extracting code block information based on the result of the code stream analyzing means; an arithmetic decoding means for arithmetically decoding a code block based on the code block information; a generating means for generating a quantization coefficient for the code block decoded by the arithmetic decoding means; and a supplying means for supplying the quantization coefficients to a cross-fading unit; a synthesizing means for synthesizing a cross-fading quantization coefficients by supplying the quantization coefficient for each of the code blocks supplied from the first and second image decoding means to first and second multipliers, the first and second multipliers multiplying the quantization coefficients for each of the code blocks by first and second real-number values, respectively, and adding the results of multiplication together by supplying the results to an adder, the adder generating the cross-fading quantization coefficient; and an arithmetic coding means for arithmetically coding the cross-fading quantization coefficient from the synthesizing means to generate a cross-faded encoded code.