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Abstract

A method and an apparatus to realize high quality image signal encoding at a variable bit rate, which is provided by the first quantization scale--maximum data volume calculation unit that calculates the maximum data volume and the first quantization scale based on encoding results of an encoded image frame, the quantization control buffer calculation unit that calculates a predicted data volume for a given encoding block that belongs to the encoding target image frame from the maximum data volume while receiving the originated data volume of the image frame that is quantized, encoding block (macroblock) by encoding unit (macroblock), by the quantization scale and calculates the second quantization scale based on the difference between the predicted data volume and the originated data volume, and the quantization control unit 10 that compares the first quantization scale with the second quantization scale to output the larger of the two scales.

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