Image encoding apparatus and method, and image decoding...

Details Image encoding apparatus and method, and image decoding... Image encoding apparatus and method, and image decoding...

2008-04-22

2008-04-22

Do, Anh Hong (Department: 2624)

Image analysis

Color image processing

Compression of color images

C382S232000, C382S233000, C382S167000

Reexamination Certificate

active

10984973

ABSTRACT:
In a color converter unit of an image encoding apparatus, a subtractor unit subtracts Y from Z and a divider unit divides the result of this subtraction (Z−Y) by 2 and supplies the result to a component signal Y1to an image coding unit. Another subtractor unit subtracts Y from X and another divider unit divides the result of this subtraction (X−Y) by 2 and supplies the result as a component signal Y2to the image coding unit. Y remains unprocessed and is supplied as a component signal Y0to the image coding unit. The image coding unit compression-codes the converted three component signals Y0, Y1, Y2according to the JPEG-2000 system to generate an encoded code stream. Thus, an image in the XYZ color space is compressed and expanded highly efficiently.

REFERENCES:
patent: 5357354 (1994-10-01), Matsunawa et al.
patent: 5608549 (1997-03-01), Usami
patent: 5742520 (1998-04-01), Uchikawa et al.
patent: 409009069 (1997-01-01), None

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