Correction of image distortion

Details Correction of image distortion Correction of image distortion

2008-09-05

2011-10-25

Tran, Phuoc (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

Reexamination Certificate

active

08045822

ABSTRACT:
An image sensor captures an image of a scene. This captured image has a pincushion distortion relative to an undistorted image of the scene. The distortion is corrected based on an approximation of the distortion D which satisfies the following equation for a given pixel in the captured image: D=(R−R′)/R=Da*(y2−x2+yoffset)+Db*R4, where R is the distance between a pixel, which corresponds in the undistorted image to the given pixel in the captured image, and the center of the undistorted image, R′ is the distance between the given pixel and the center of the captured image, Da and Db are respective distortion parameters of the image sensor, x and y are coordinates of the given pixel in the captured image, R satisfies the following equation: R2=x2+y2and yoffsetcorresponds to a constant value.

REFERENCES:
patent: 6002454 (1999-12-01), Kajiwara et al.
patent: 2002/0164083 (2002-11-01), Song et al.
patent: 2006/0188172 (2006-08-01), Higurashi et al.

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