Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2005-03-01
2005-03-01
Do, Anh Hong (Department: 2624)
Image analysis
Image compression or coding
Transform coding
C382S232000, C382S249000
Reexamination Certificate
active
06862371
ABSTRACT:
A method of manipulating spectral content of a block of pixels for compression includes the step of classifying each pixel within a selected block of pixels as relevant or irrelevant. A forward transform is applied to the selected block to generate a coefficient block. The coefficient values are modified to generate a modified coefficient block subject to a set of pre-determined constraints including a constraint that the relevant pixels have a same value in an inverse transformation of the modified coefficient block as in the selected block. Proceeding in a reverse zig zag coefficient order the method is repeated for other coefficients having non-zero quantized values.
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Yabin Yu et al: “Pictorial Transform Coding for Tessellating Arbitrary Shaped Regions” Signal Processing Theories and Applications, Barcelona, Sep. 18-21, 1990. pp. 901-904 XP000365734.
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