Projected image linewidth correction apparatus and method

Details Projected image linewidth correction apparatus and method Projected image linewidth correction apparatus and method

1991-04-04

1992-05-05

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 1, 382 22, 358101, 372 26, 359197, G06K 900

Patent

active

051115131

ABSTRACT:
An apparatus for correcting deviations in image linewidth in a image projection system having a laser and a liquid crystal cell wherein images are made on the liquid crystal cell by impinging the laser on said cell. The apparatus also has apparatus for creating a test image having a plurality of lines of specific width on a liquid crystal cell and calculating the difference between the linewidth of the plurality of lines of said test image as created and as expected. Furthermore, apparatus are provided for modifying the period of the laser light based on said differences in linewidth between the plurality of lines (as created and as expected) to correct deviations in image linewidth, whereby deviations in image linewidth are substantially eliminated.

REFERENCES:
patent: 3952405 (1976-04-01), West
patent: 4013466 (1977-03-01), Klaiber
patent: 4564853 (1986-01-01), Egan
patent: 4583125 (1986-04-01), Yamada
patent: 4668982 (1987-05-01), Tinnerino
patent: 4736159 (1988-04-01), Shiragasawa et al.
patent: 4810064 (1989-03-01), Azusama et al.
patent: 5014326 (1991-05-01), Turner et al.

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