Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-07-31
1988-07-26
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358142, 358 10, 354 20, H04N 1700, H04N 708
Patent
active
047604476
ABSTRACT:
A calibration pattern (FIG. 2) is utilized to adjust the calibration of a video monitor (C) and a multi-format camera (D). The multi-format camera (D) includes a video display (12) and photographic equipment (20) internally therein such that received signals indicative of an image are turned into a photograph. The test pattern includes a first region (30) having a background (34) and a series of holes or dots (36) thereon. Each hole has progressively greater contrast with the first background such that the number of visible holes is indicative of whether the video monitor and multi-format camera are in proper calibration. A second region (40) is similar to the first region but has gray holes on a white background. A third region (50) has a plurality of tuning fork-like subregions having different gray scales levels. The brightness of a fourth region (70) varies sinusoidally. A fifth region (80) has square holes and a sixth region (90) has circular holes. The holes are of incrementally displaced brightness levels against a black or white background. The camera is initially calibrated in a conventional manner using photodensitometer measurements. To verify the calibration subsequently, another photograph is taken and the number of visible subregions in each region are compared with the reference photograph. The brightness and contrast calibration of the video monitor are adjusted until the number of visible subregions matches the reference photograph.
REFERENCES:
patent: 2380244 (1945-07-01), Jones et al.
patent: 4093960 (1978-06-01), Estes
patent: 4106846 (1978-08-01), Russin
patent: 4533950 (1985-08-01), Harshbarger
"Test Pattern for Video Displays and Hard-Copy Cameras", J. E. Gray et al., Radiology, pp. 519-528, Feb. 1985.
Koka Narasimha R.
Szabo William E.
Groody James J.
Peng John K.
Picker International Inc.
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