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Image compression device allowing rapid and highly precise encoding while suppressing code amount of image data after compression
Image compression device allowing rapid and highly precise encoding while suppressing code amount of image data after compression
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机译：图像压缩装置，在抑制压缩后的图像数据的代码量的同时，能够进行快速且高精度的编码
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摘要
The data transfer is repeatedly performed through a path constituted of an image holding RAM→a Huffman decoding circuit→an inverse quantization circuit→a quantization circuit→a Huffman encoding circuit until a code amount of compression image data generated by the Huffman encoding circuit becomes equal to or smaller than a maximum value determined according to an image quality, and thus a quantization threshold value and a Huffman code are determined. Every time the process is repeated, the quantization threshold value stored in a table of a first RAM and a Huffman code stored in a table of a second RAM corresponding to the quantization circuit and the Huffman encoding circuit, respectively, are newly set to a slightly higher value. As a quantization threshold value to be set in a table of a third RAM corresponding to the inverse quantization circuit, a quantization threshold value set in the first RAM at the previous quantization is used. As a Huffman code to be set in a table of a fourth RAM corresponding to the Huffman decoding circuit, a Huffman code set in the second RAM at a previous variable length encoding is used.
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