Explicit DST-based filter operating in the DCT domain

Details Explicit DST-based filter operating in the DCT domain Explicit DST-based filter operating in the DCT domain

1998-04-29

2000-09-26

Tadayon, Bijan

Image analysis

Image compression or coding

Transform coding

382248, G06K 900

Patent

active

061252123

ABSTRACT:
An explicit DST-based filter that comprises a trigonometric transform module, first and second transform coefficient processors (TCPs), an inverse trigonometric transform module and first and second summing arrangements. The trigonometric transform module applies a trigonometric transform to blocks of DCT coefficients related to input blocks of DCT coefficients to generate corresponding input blocks of transform coefficients of a second type ("second coefficients"). The first TCP includes matrix multipliers that generate a multiplied block of DCT coefficients and a multiplied block of second coefficients by multiplying, by diagonal multiplying matrices, intermediate blocks of DCT coefficients derived from the input blocks of DCT coefficients. The second TCP includes matrix multipliers that generate at a multiplied block of DCT coefficients and a multiplied block of second coefficients by multiplying, by diagonal multiplying matrices, intermediate blocks of second coefficients derived from the input blocks of second coefficients. The first summing arrangement sums the multiplied blocks of DCT coefficients to generate a first final block of DCT coefficients, and sums the multiplied blocks of second coefficients to generate a first final block of second coefficients. The inverse trigonometric transform module applies an inverse trigonometric transform to the first final block of second coefficients to generate a second final block of DCT coefficients. The second summing arrangement sums the first and second final blocks of DCT coefficients to generate a block of DCT coefficients constituting a block of a filtered information signal.

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