The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2000
Filed:
Sep. 14, 1998
Rong-Fuh Shyu, Hsinchu, TW;
Winbond Electronics Corp., Hsinchu, TW;
Abstract
In order to reduce the number of multiplication operations in a video compressing apparatus, a predetermined original quantizer matrix is compensated with a set of scaling coefficients derived from a sixth intrinsic multiplication stage of a discrete cosine transform (DCT) fast algorithm to obtain a modified quantizer matrix. Thereafter, a DCT unit is configured to perform DCT on an input data block based on the DCT fast algorithm while dispensing with the sixth intrinsic multiplication stage of the DCT fast algorithm to result in scaled transform data. A quantizer is configured so as to quantize the scaled transform data in accordance with the modified quantizer matrix. To reduce the number of multiplication operations in a video decompressing apparatus, a predetermined original dequantizer matrix is compensated with a set of pre-scaling coefficients derived from a first intrinsic multiplication stage of an IDCT fast algorithm to obtain a modified dequantizer matrix. Thereafter, an inverse quantizer is configured so as to dequantize input quantized DCT data in accordance with the modified dequantizer matrix. An IDCT unit is configured to perform IDCT on the output of the inverse quantizer based on the IDCT fast algorithm while dispensing with the first intrinsic multiplication stage of the IDCT fast algorithm.