Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2007-10-23
2007-10-23
Bella, Matthew C. (Department: 2624)
Image analysis
Image compression or coding
Transform coding
C382S232000, C382S251000, C375S240200
Reexamination Certificate
active
10645434
ABSTRACT:
The present invention provides a method for detecting and classifying block edges from DCT-compressed images, and more particularly, a fast method for classifying the edge direction of each block in the DCT-compressed images. The method includes: extracting DCT coefficients by blocks constituting the compressed image; and applying an arithmetic operation defined for each direction component to the DCT coefficients, and comparing the results of the arithmetic operations to determine the edge direction component. The present invention is directly applied in the DCT domain based on the quantitative analysis on the contribution factor of each DCT coefficient to formation of the directional pattern of the block edge, thereby drastically reducing the computational complexity of arithmetic operations necessary to the detection and classification of block edges.
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Chang Hyun Sung
Kang Kyeongok
Kim Jin-woong
Bayat Ali
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
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