Image correction apparatus using a displayed test signal

Details Image correction apparatus using a displayed test signal Image correction apparatus using a displayed test signal

1994-03-17

1996-07-02

Groody, James J.

Television

Video display

Cathode-ray tube

348180, 348177, H04N 1700, H04N 1702

Patent

active

055327656

ABSTRACT:
An apparatus for correcting images includes: a test signal generator for generating a test signal; a display device for displaying the test signal in a region on a display screen; an imaging device for imaging the test signal displayed on the display screen in a scanning direction so as to produce an image signal having a rising linear portion and a falling linear portion along the scanning direction; a position calculator for calculating a position of a centroid of the image signal for each of R, G and B colors, based on the rising linear portion and the falling linear portion; an error detector for detecting an amount of error between the detected positions of the centroids for R, G and B colors; a correction circuit for correcting a convergence and a geometric distortion for the region, based on the amount of error.

REFERENCES:
patent: 4999703 (1991-03-01), Henderson
patent: 5200815 (1993-04-01), Tsujihara et al.
patent: 5298985 (1994-03-01), Tsujihara et al.
patent: 5345262 (1994-09-01), Yee et al.

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