Two-dimensional finite impulse response filter arrangements

Details Two-dimensional finite impulse response filter arrangements Two-dimensional finite impulse response filter arrangements

1986-12-03

1989-01-31

Harkcom, Gary V.

Boots, shoes, and leggings

382 56, G06F 738

Patent

active

048021105

ABSTRACT:
A two-dimensional finite impulse response (2D-FIR) filter arrangement includes a 2D-FIR filter (26,30,32,34) operative during each of successive clock periods equal to T (where T is the spacing of digital samples or words of an image signal) to effect filtration over a predetermined area of the image by processing n.times.m words of the signal, having a predetermined spatial relationship in the form of an array, to produce an intermediate word. Some of the intermediate words are stored in a partial products store (28). A controller (60) is responsive to a signal (HCF,VCF) indicating an extent to which the image is to be compressed to do two things. First, it causes the FIR filter (26,30,32,34) to adopt a bandwidth which is reduced, with respect to a value for zero compression, by an extent related to the extent of compression. This reduces or prevents aliasing that otherwise would be caused by the compression operation. Second, it causes a plurality of the intermediate words, the size of which plurality is related to the extent of compression, to be combined (48) to produce output words (56) representation of filtration over an area of the image which is a multiple of the predetermined area, thereby improving the response of the filter arrangement.

REFERENCES:
patent: 4610026 (1986-09-01), Tabata et al.
patent: 4682301 (1987-07-01), Horiba et al.

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