Image quantization method and apparatus with color...

Details Image quantization method and apparatus with color... Image quantization method and apparatus with color...

2007-08-07

2011-10-25

Mehta, Bhavesh (Department: 2624)

Image analysis

Image compression or coding

Quantization

C382S253000, C348S273000, C348S400100, C358S465000, C358S466000, C375S240010, C375S240030

Reexamination Certificate

active

08045816

ABSTRACT:
An image quantization method and apparatus are provided in which a block with a high possibility of having color distortion is more elaborately quantized using a predetermined color distortion removing quantization matrix. The image quantization method includes determining a possibility of color distortion in the block using discrete cosine transform (DCT) coefficients and pixel values of the block of predetermined size of an image and performing initial quantization on the block using a predetermined color distortion quantization matrix to remove color distortion if the block has a high possibility of color distortion.

REFERENCES:
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patent: 6320668 (2001-11-01), Kim
patent: 6600836 (2003-07-01), Thyagarajan et al.
patent: 2001/0045988 (2001-11-01), Yamauchi et al.
patent: 03283989 (1991-12-01), None
patent: 10-013859 (1998-01-01), None
patent: 2000-092329 (2000-03-01), None
patent: 20010104058 (2001-11-01), None
patent: WO 0156298 (2001-08-01), None

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