Image analysis – Image compression or coding – Transform coding
Patent
1997-08-28
2000-04-11
Kelley, Christopher S.
Image analysis
Image compression or coding
Transform coding
382248, 382251, 348390, 348405, 348421, G06K 936
Patent
active
060496347
ABSTRACT:
The image compression device comprises a DCT processing unit, a statistical value processing unit, a quantization table generation unit, a quantization processing unit and a compression processing unit. In the DCT processing unit, luminance data and color difference data are subjected to a two-dimensional DCT to obtain DCT coefficients. In the statistical value processing unit, the DCT coefficients are subjected to a quantization and a dequantization so that a quantization error is calculated for every spatial frequency. In the quantization table generation unit, a quantization coefficient is obtained such that the quantization error becomes a minimum for every spatial frequency, so that a quantization table composed of the quantization coefficients is generated. The DCT coefficients are quantized using the quantization table in the quantization processing unit. In the compression processing unit, the quantized DCT coefficients are compressed, and recorded in a recording medium together with the quantization table.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Chawan Sheela
Kelley Christopher S.
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