Image analysis – Image compression or coding – Including details of decompression
Reexamination Certificate
2007-12-11
2007-12-11
Ahmed, Samir (Department: 2624)
Image analysis
Image compression or coding
Including details of decompression
C382S248000, C382S275000, C375S240190, C375S240240, C375S240250
Reexamination Certificate
active
10673862
ABSTRACT:
A method of compressing a current image of a sequence of images is disclosed. Firstly, the current image is transformed with a predetermined transform such as the DWT to provide a set of transform coefficients (step2202). The method then retrieves (step2303), for at least one transform coefficient of a current image, a predetermined number of bits, preferably two, of a corresponding transform coefficient of a previously compressed image of the sequence. The corresponding transform coefficient is truncated at a truncation bitplane and the retrieved bits are the least significant bits of the truncated corresponding transform coefficient. The transform coefficient of the current image is set to a new value that is a function of the retrieved bits (step2306) and bits of the transform coefficients of the current image are stored for use in compressing one or more subsequent images of the sequence (step2208).
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Andrew James Philip
Becker Axel
Bradley Andrew Peter
Hardy Stephen James
M Poulouin David Dominique
Ahmed Samir
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Motsinger Sean
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