Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-10-16
1991-11-12
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358211, 378 99, H04N 532, H04N 530
Patent
active
050652389
ABSTRACT:
A patient (12) is irradiated with x-rays (10) from an x-ray tube (A). X-rays that have passed through a region of interest of the patient are converted to a light image by a phosphor screen (14) on the dome shaped input face (16) of an image intensifier (B). The dome shaped input face causes the output optical image (20) of the image intensifier to be distorted with pin cushion distortion. The sweep pattern of the electron beam of a video pick up tube (24) of a video camera (C) is controlled by deflection plates (26a, 26b, 26c, 26d). A sweep control circuit (D) alters the sweep pattern such that electronic image representations generated by the video camera are distorted in a manner that is complementary to and cancels the image intensifier tube distortion. In this manner, the two distortions cancel and a man-readable image (28) displayed on a video monitor (22) is substantially distortion-free. The sweep control circuit alters conventional vertical sweep control voltage ramps (V) and horizontal control voltage ramps (H) by adding third order, parabolic terms:
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Data Display Interfaces for CRT Deflection/Focus Correction, no author listed, before 1988, pp. 63-65.
Leong David L.
Plut Leonard F.
Vagi Robert J.
Groody James J.
Metjahic Safet
Picker International Inc.
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