Image encoder, image encoding method, image decoder, and...

Details Image encoder, image encoding method, image decoder, and... Image encoder, image encoding method, image decoder, and...

2005-02-16

2008-12-09

Hung, Yubin (Department: 2624)

Image analysis

Image compression or coding

Pyramid, hierarchy, or tree structure

C382S233000, C382S248000, C348S403100, C358S426140

Reexamination Certificate

active

07463780

ABSTRACT:
In an image encoder, a first quantization section which is selected when normal image quality is required performs quantization by dividing a wavelet transformation coefficient by a quantization step size and by thereafter rounding down a fraction thereof. On the other side, a second quantization section which is selected when high image quality is required performs quantization by dividing a wavelet transformation coeffient by a quantization step size, by adding 0.5 to the dividing result, and by thereafter rounding down a fraction thereof. Therefore, the width of a dead zone where coefficients are quantized to a value of 0 is narrower than that in the first quantization section, and higher image quality is obtained accordingly.

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Michael J. Gormish, et al., JPEG 2000: Overview, Architecture, and Applications, 2000.

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