Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2006-11-28
2006-11-28
Wong, Allen (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
C375S240010, C375S240120, C375S240200
Reexamination Certificate
active
07142598
ABSTRACT:
Adaptive DCT/IDCT apparatus based on energy and method for controlling the same. The adaptive DCT/IDCT apparatus relates to a coding unit of a MPEG4/H.263 video coder, and performs an image processing operation with a high image quality at a high speed by calculating energy values for respective blocks and a mean energy value of the whole image. The apparatus includes an energy calculator for receiving an input image, dividing the input image into blocks of predetermined size, calculating energy values for respective blocks and a mean energy value, and comparing the energy values with the mean energy value; a DCT unit for dividing the input image into predetermined blocks, and performing a DCT operation on the divided blocks; an image coefficient processor for receiving DCT coefficients for respective blocks from the DCT unit according to a result of the comparison of the block's energy value and the mean energy value, and rearranging the DCT coefficients; and an IDCT unit for receiving rearranged DCT coefficients from the image coefficient processor, performing an IDCT operation on the rearranged DCT coefficients, and creating a restored image.
REFERENCES:
patent: 5598484 (1997-01-01), Suzuki et al.
patent: 5719961 (1998-02-01), Normile et al.
patent: 6192080 (2001-02-01), Sun et al.
patent: 6606126 (2003-08-01), Lim et al.
patent: 0 577 337 (1993-06-01), None
patent: 0 684 738 (1995-05-01), None
patent: 2 285 359 (1995-07-01), None
JVT: “Text of Committee Draft of Joint Video Specification (ITU-T Rec. H.264 ISO/IEC 14496-10 AVC”, May 2002.
Chaddha et al., “Variable Compression Using JPEG”, 1994 IEEE, pp. 562-569.
Ramachandran et al., “A Fast, FPGA-Based MPEG-2 Video Encoder With A Novel Automatic Quality Control Scheme”, Microprocessors and Microsystems, 25 (2002) 449-457.
Dugad et al., “A Fast Scheme for Downsampling and Unsampling in the DCT Domain”, 1999 IEEE, pp. 909-913.
Kim Dae-Won
Lee Seung-Cheol
Dilworth & Barrese LLP
Samsung Electronics Co,. Ltd.
Wong Allen
LandOfFree
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