Patent ID: 6317767
Filing Date: 2001-11-13
Classification: G06F

Abstract:
A method for performing an inverse discrete cosine transform, performed by a processor that generates intermediate values, comprising the stages of:(a) receiving discrete cosine transform data representing weighted spatial frequencies of image data;(b) combining, in a first stage, the discrete cosine transform data with a first set of constants to obtain first-stage output data;(c) combining, in a second stage, the first-stage output data with a second set of constants to obtain second-stage output data;(d) transposing the second-stage output data in a third stage;(e) combining, in a fourth stage, the transposed second-stage output data with a third set of constants, wherein all elements of the second set of constants are 0, 1, or -1; and(f) outputting output components representing pixel information of an image.