Compression encoder

Details Compression encoder Compression encoder

2004-12-07

2009-11-03

Do, Anh Hong (Department: 2624)

Image analysis

Image compression or coding

Pyramid, hierarchy, or tree structure

C382S232000, C382S233000, C382S251000

Reexamination Certificate

active

07613352

ABSTRACT:
A DWT unit applies wavelet transform to an input signal to output transform coefficients, and a quantization unit quantizes those transform coefficients with a quantization step size determined according to target image quality. Then, a rate control unit controls the rate of coded data according to information on the quantization step size. Also, an image-quality control unit controls the rate of only part of coded data which is determined from a priority table. This achieves a compression encoder which operates at high speed with minimal operations.

REFERENCES:
patent: 6778709 (2004-08-01), Taubman
patent: 2000-41249 (2000-02-01), None
patent: 2002-165098 (2002-06-01), None
patent: 2003153228 (2003-05-01), None
David S. Taubman, et al., “JPEG2000 Image Compression Fundamentals, Standards, and Practice”, Kluwer Academic Publishers, 4 cover pages, p. 142, pp. 192 and 193, 1 page chapter 16, and pp. 626 through 631, 2002.
“JPEG 2000 Part 1 FDIS (includes COR 1, COR 2, and DCOR 3)”, ISO/IEC JTC 1/SC 29/WG1 (ITU-T SG8) N2406, Dec. 4, 2001, 2 cover pages, pp. i-iii, pp. 214-217.
U.S. Appl. No. 11/333,280, filed Jan. 18, 2006, Mizuno.

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