Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-01-23
1980-03-11
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 65, H04N 962
Patent
active
041930860
ABSTRACT:
A pattern signal for sequentially displaying crisscross patterns of three primary colors of red, green and blue is supplied to a color picture tube. Two television cameras pick up the pattern images displayed on the color picture tube through a 1:1 half mirror. The line scanning directions of the first and second television cameras are horizontal and vertical respectively with respect to the CRT display screen. The aspect ratio of the first television camera is selected to be equal to that of the CRT display screen, and the aspect ratio of the second television camera is selected to be equal to the reciprocal of that of the CRT display screen. The image output signals of these two television cameras are selectively supplied to an image processing circuit by a change-over unit. In this image processing circuit, a counter counts the time-related positions of peak values appearing within a specified line scanning period in the image signals supplied through the change-over unit. The degree of convergence is detected by detecting the differences between the time-related peak value positions in the red, green and blue patterns.
REFERENCES:
patent: 2578298 (1951-12-01), Goldsmith
patent: 4115802 (1978-09-01), Kramer
Hitachi , Ltd.
Martin John C.
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