Apparatus for detecting a geometric distortion of an image on a

Details Apparatus for detecting a geometric distortion of an image on a Apparatus for detecting a geometric distortion of an image on a

1994-03-21

1995-07-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

348813, H01J 3126

Patent

active

054324041

ABSTRACT:
For the purpose of detecting a geometric distortion of an image on a screen of a CRT display device, i.e., the deviation of the positional coordinates at a high speed and with a high accuracy, the positions of window images having about 10 rows and 10 columns which are arranged in a matrix on the screen of the display device, including a screen frame, are photographed through a predetermined low-pass filter by a monochromatic CCD camera, and further, both the low-light field picture and the high-light field picture are photographed, whereby the positions of the window images can be detected with a high accuracy within 0.1 CCD pixel by the elimination of a dark current, the normalization of detection sensitivity and the interpolation calculation. Therefore, the detection of the geometric distortion can be performed at a high speed and with a high accuracy by an inexpensive monochromatic CCD camera which has the number of pixels less than the total number of pixels of the display device.

REFERENCES:
patent: 4760453 (1988-07-01), Hieda
patent: 4980614 (1990-12-01), Yamada et al.
patent: 5272536 (1993-12-01), Sudo et al.
patent: 5345262 (1994-09-01), Yee et al.

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