Patent ID: 6100930
Filing Date: 2000-08-08
Classification: G06T,H04N

Abstract:
A method for producing a wipe sequence bitstream from a first and second compressed video bitstream, the method comprising the steps of:a. partially decoding the first compressed video bitstream to obtain its block-based DCT coefficients;b. providing DCT coefficients for a predetermined wipe function;c. convolving the block-based DCT coefficients for the first compressed video bitstream with the DCT coefficients of the predetermined wipe function to obtain a first convolved video bitstream;d. partially decoding the second compressed video bitstream to obtain its block-based DCT coefficients;e. providing DCT coefficients for a complement wipe function to the predetermined wipe function;f. convolving the block-based DCT coefficients of the second compressed video bitstream with the DCT coefficients for the complement wipe function to the predetermined wipe function to obtain a second resulting compressed video bitstream; andg. summing the first and second resulting compressed video bitstreams to obtain a compressed output video bitstream.