Orthogonal transform processor

Details Orthogonal transform processor Orthogonal transform processor

1997-05-19

1999-04-13

Mai, Tan V.

Boots, shoes, and leggings

36472502, G06F 1714

Patent

active

058944303

ABSTRACT:
A two-dimensional discrete cosine transform processor (two-dimensional DCT processor) includes two one-dimensional DCT circuits and a transposition memory interposed therebetween. Each of the two one-dimensional DCT circuits includes a butterfly operation circuit and a distributed arithmetic circuit at the subsequent level. Partial sums of vector inner products based on a constant matrix obtained by multiplying respective elements of a discrete cosine matrix by frequency-depending weighting according to human visual sense are stored in ROMs included in the distributed arithmetic circuit, and the contents of the ROMs are used to obtain a one-dimensional DCT result with weighting given. In this manner, arbitrary weighting can be given to the transform result without using a multiplier. Thus, for example, in a compressing and coding system for image data, the compression efficiency can be improved as compared with the case where weighting is not given to the transform result.

REFERENCES:
patent: 4791598 (1988-12-01), Liou et al.
patent: 5117381 (1992-05-01), Juri et al.
patent: 5654910 (1997-08-01), Iwata
patent: 5703799 (1997-12-01), Ohta

Affiliated with

Also associated with

Rating

Orthogonal transform processor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Orthogonal transform processor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal transform processor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-226117