Apparatus and method for image/video compression using...

Details Apparatus and method for image/video compression using... Apparatus and method for image/video compression using...

2006-07-11

2006-07-11

Do, Anh Hong (Department: 2627)

Image analysis

Image compression or coding

Pyramid, hierarchy, or tree structure

C382S166000, C382S245000

Reexamination Certificate

active

07076108

ABSTRACT:
The inventions provides a method for compressing image data comprising the steps of: performing a color transformation of the data; wavelet-transforming the color-transformed data via division and multiplication operations being substituted with six lookup tables in order to provide a series of wavelet coefficients in different levels of wavelet transformation subbands; quantizing in accordance with a special equation the wavelet coefficients which fall above a predetermined threshold value to provide a series of quantized wavelet coefficients; applying an entropy coding to the quantized wavelet coefficients with a particular Huffman table; and compressing the coded wavelet coefficients to provide compressed data.

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Crouse et al., “Joint Thresholding and Quantizer Selection for Transform Image Coding: Entropy-Constrained Analysis and Applications to Baseline JPEG”, IEEE, vol. 6, No. 2, Feb. 1997, pp. 285-297.

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