Image signal processing with filtering to account for image mapp

Details Image signal processing with filtering to account for image mapp Image signal processing with filtering to account for image mapp

1986-11-04

1988-07-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358 22, 358 37, 358166, 382 54, G06K 900

Patent

active

047606053

ABSTRACT:
An image signal processing apparatus comprises a memory (12) and an address generator (14) that generates addresses for allocation to successive words of a digital input signal (10) representing an input image for mapping those words (or words obtained by interpolation therefrom) into the memory (12) in such a manner that individual portions of the mapped image stored in the memory may be compressed and/or rotated with respect to corresponding portions of the input image. A digital filter (40) of variable bandwidth effects two-dimensional filtering of the image before it is stored in the memory (12). Local scaling factor computation means (42) monitors the addresses allocated by the address generator (14) to successive sets of words of the input signal corresponding to successive local image areas and computes from each set of addresses, for the corresponding set of words, a local scaling factor representing the extent of compression and/or rotation of the local area. Bandwidth control means (44) is responsive to the successive local scaling factors computed by the computation means (44) to vary the bandwidth of the filter (40) in a sense to minimize aliasing that would be caused by compression and/or rotation of the local areas.

REFERENCES:
patent: 4432009 (1984-02-01), Reitmeier et al.
patent: 4578812 (1986-03-01), Yui
patent: 4602285 (1986-07-01), Beaulier et al.
patent: 4652908 (1987-03-01), Fling et al.
patent: 4656515 (1987-04-01), Christopher
patent: 4660081 (1987-04-01), Heerah
patent: 4665433 (1987-05-01), Hinson et al.
patent: 4672463 (1987-06-01), Tomohisa et al.

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