Image analysis – Image compression or coding – Lossless compression
Patent
1997-06-27
1999-09-07
Au, Amelia
Image analysis
Image compression or coding
Lossless compression
382232, 382248, 348398, 39520077, G06K 936
Patent
active
059499125
ABSTRACT:
A digitized image is divided into blocks and a wavelet transform is performed, producing wavelet blocks which are quantized, scanned into linear sequences, and then coded. The scanning of each wavelet block starts with a purely low-frequency element. The high-frequency elements are scanned in a sequence that depends on the occurrence of non-zero elements among the high-frequency elements. When a non-zero element is scanned, this information is used to proceed quickly to related high-frequency elements. This scanning method tends to produce a linear sequence in which non-zero elements are clustered together. Such sequences can be coded efficiently.
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Au Amelia
Dastouri Mehrdad
OKI Electric Industry Co., Ltd.
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