Importance

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Abstract

According to this invention, the encoded data amount of an image and its area attribute information can be encoded to a target amount or less by one input operation of image data, and an input image can be efficiently encoded in accordance with the property of the image. For this purpose, an encoding sequence unit sets an initial quantization matrix table for an image encoding unit in accordance with a mode set by a mode setting unit, and sets parameters associated with attribute rewrite for an attribute rewrite unit. When an image is input, encoded image data generated by the image encoding unit is stored in a memory. Attribute-encoded data generated by an attribute encoding unit is also stored in the memory. The first counter counts an encoded-image data amount, and the second counter counts an attribute-encoded data amount. When the sum of these encoded data exceeds a target amount, the encoding sequence control unit updates the quantization matrix table for the image encoding unit, and causes the image encoding unit to continue encoding. The updated quantization matrix table is set for a re-encoding unit, and encoded data stored in the memory is re-encoded.

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First Claim