Method and device for determining shading correction data, and f

Details Method and device for determining shading correction data, and f Method and device for determining shading correction data, and f

1988-06-03

1991-10-01

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358163, 358 76, 354 76, H04N 584, H04N 323

Patent

active

050538799

ABSTRACT:
A method and device for shading correction used in a video printer comprises a TV camera for providing image data of a subject to be printed and an exposure display means such as an exposure CRT for displaying the image data thereon and to which photographic paper is exposed to make a video print of the subject. The method of shading correction comprises the steps of making a video print of a reference subject with an uniform density using the video printer, obtaining the difference between image data of the video print and the image data of the reference subject as shading correction data, and adding the shading correction data and the image data of a subject to be printed, thereby effecting shading correction for a video print of the subject made by the video printer. In carrying out the shading correction method, the shading correction device employs a memory for storing the shading correction data, a frame memory for storing image data of a subject to be printed and a device for adding the shading correction data read out from the memory and the image data read out from the frame memory.

REFERENCES:
patent: 4433345 (1984-02-01), Haddick et al.
patent: 4468693 (1984-08-01), Fujita et al.
patent: 4473849 (1984-09-01), Cool
patent: 4757334 (1988-06-01), Volent
patent: 4766503 (1988-08-01), Lambert et al.
patent: 4786756 (1988-10-01), Shiota et al.
patent: 4794460 (1988-12-01), Shiota
patent: 4802007 (1989-01-01), Van der Brug

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