Defect compensation for discrete image bars

Details Defect compensation for discrete image bars Defect compensation for discrete image bars

1987-08-26

1988-06-14

Evans, Arthur G.

Boots, shoes, and leggings

346154, G01D 1506

Patent

active

047516593

ABSTRACT:
A discrete image bar having defective pixel generators redundantly addresses all pixel positions within an address space to produce an essentially defect free image. To that end, the footprint of the pixel generators of the image bar is shifted back and forth across an integer number of pixel positions widthwise of the address space as a function of time, and the input data for the image bar is synchronously countershifted in the opposite direction across an equal number of pixel generators, thereby sequentially bringing at least two different pixel generators into imaging alignment with each pixel position, without materially affecting the address space alignment of the input data. All of the defective pixel generators of the image bar are disabled, so the input data for them are shifted onto non-defective pixel generators after a suitable time delay, whereby the image corresponding to this shifted data is superimposed, sequentially in time, on the image corresponding to the unshifted data for the non-defective pixel generators. These partial images are recorded on a suitable recording medium, thereby causing them to incoherently spatially sum with each other to create an essentially defect free image of the spatial pattern represented by the input data.

REFERENCES:
patent: 4318135 (1982-03-01), Allis et al.
patent: 4367925 (1983-01-01), Sprague et al.
patent: 4396252 (1983-08-01), Turner
patent: 4450459 (1984-05-01), Turner et al.
patent: 4488808 (1984-12-01), Kato
patent: 4509058 (1985-04-01), Fischbeck
patent: 4547896 (1985-10-01), Ohrombe et al.
patent: 4673953 (1987-06-01), Hecht

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