Image correction apparatus

Details Image correction apparatus Image correction apparatus

G - Physics

06

T

G06T 5/00 (2006.01) H04N 9/28 (2006.01) H04N 17/04 (2006.01)

Patent

CA 2119216

- 77 - ABSTRACT OF THE DISCLOSURE 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 cor- recting a convergence and a geometric distortion for the region, based on the amount of error.

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