Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2006-01-10
2006-01-10
Patel, Kanjibhai (Department: 2625)
Image analysis
Image compression or coding
Transform coding
C382S166000, C382S251000, C348S413100, C358S426140, C375S240200
Reexamination Certificate
active
06985635
ABSTRACT:
A method and system of reducing the computation load of an MPEG decoder by changing the encoding algorithms in a video-processing system are provided. During an encoding mode, a stream of data blocks is received and at least one motion vector and one motion compensation prediction value for each macro-block are generated. The prediction value is transformed into a set of DCT coefficients. Prior to the quantizing step, the set of DCT coefficients are modified according to predetermined criteria. To this end, the total energy level of the DCT coefficients excluding the lowest 2×2 DCT coefficients is computed, and last column and last row of the DCT coefficients is discarded alternatively until the total energy level of the DCT coefficients reaches a predetermined energy level. Therafter, the discarded column or row is assigned to a predetermined value. The modified DCT coefficients are then quantized and encoded, thereby generating a bit stream of encoded macro-blocks, which are subsequently decoded according to a conventional decoding process.
REFERENCES:
patent: 5598484 (1997-01-01), Suzuki et al.
patent: 6049629 (2000-04-01), Hirabayashi
Bhaskaran et al. (Image and Video Compression Standards: Algorithms and Architectures, 2nd ed., 1997, pp. 158-161 & 186-190).
Chen Yingwei
Zhong Zhun
Hung Yubin
Koninklijke Philips Electronics , N.V.
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