Spatial prefilter for variable-resolution sampled imaging system

Details Spatial prefilter for variable-resolution sampled imaging system Spatial prefilter for variable-resolution sampled imaging system

1983-08-12

1985-11-19

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, H04N 530

Patent

active

045545855

ABSTRACT:
Aliasing in detected image samples is substantially reduced by a spatial low-pass prefilter employing a diffusing surface variably spaced from an imager and situated in the path of projected image light to cause greater blurring in lower resolution regions of the imager than in higher resolution regions thereof, such that the cutoff spatial frequency varies continually in accordance with the variable resolution of the system.

REFERENCES:
patent: 4028725 (1977-06-01), Lewis
patent: 4061914 (1977-12-01), Green
patent: 4100570 (1978-07-01), Nobutoki et al.
patent: 4101929 (1978-07-01), Ohneda et al.
patent: 4198646 (1980-04-01), Alexander et al.

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