Image analysis – Image compression or coding – Interframe coding
Reexamination Certificate
2007-01-02
2007-01-02
Bella, Matthew C. (Department: 2624)
Image analysis
Image compression or coding
Interframe coding
C382S238000, C382S248000, C382S240000, C382S250000, C375S240120, C375S240160
Reexamination Certificate
active
10420887
ABSTRACT:
An image processing apparatus includes an image compression device which performs a discrete wavelet transform of pixel values for each rectangular portion to produce wavelet coefficients, and performs a hierarchical compression coding of the wavelet coefficients for each rectangular portion so that a codestream is produced. A codestream transform device is provided to reduce an amount of code data in the codestream. The codestream transform device comprises a syntax analysis unit which analyzes header information of each rectangular portion in the codestream. A comparison unit determines a similarity of pixel values between a current frame and a preceding frame in the codestream based on a result of the analysis. A codestream generating unit deletes code data of a corresponding rectangular portion of the current frame when the similarity is larger than a given threshold value.
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Bayat Ali
Bella Matthew C.
Ricoh & Company, Ltd.
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