Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-07-11
1992-01-14
Kostak, Victor R.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, 358 10, 358139, H04N 964, H04N 973, H04N 1702
Patent
active
050815237
ABSTRACT:
A display image correction system (20) corrects display image errors by detecting deviations in the display image from the input image on a pixel-by-pixel basis. The image correction system detects pixel output, and then provides correction signals to the display system's image generator for correcting display image errors (such as intensity errors, or for color systems, RGB color errors). For a color CRT display system with a single-beam image generator, the image correction system (20) includes RGB pixel color output detectors (22R, 22G, 22B) and an image correction subsystem (24). For each pixel the display image, the RGB detectors (22R, 22G, 22B) detect component color amplitude, providing corresponding detector signals to the image correction subsystem (24). The image correction subsystem corrects pixel color output errors by providing position correction signals to the display's image generator (14), repositioning the image beam within the pixel relative to the constituent RGB color phosphors, and corrects intensity errors by providing an intensity correction signal that adjusts beam current. The image correction method is adaptable to a wide variety of display systems, such as CRT monochrome and color displays, and fixed-position LCD and LED displays. It can operate on a real time basis using feedback of detected pixel output from a display image, or on a sampled basis using stored correction factors calculated from a test image. An analog implementation of the image correction subsystem (24) is used for the real-time application (FIGS. 5A and 5B), while a digital implementation is used for the sampled-test-image application (FIG. 6).
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Donaldson Richard L.
Grossman Rene E.
Kostak Victor R.
Lee Michael H.
Stoltz Richard A.
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