Underwater archaeological mosaicing
ICCOMP'06 Proceedings of the 10th WSEAS international conference on Computers
3D city model generation from ground images
CGI'06 Proceedings of the 24th international conference on Advances in Computer Graphics
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The paper presents an approach for a robust (semi-)automatic correction of radial lens distortion in images and videos. This method, based on Hough Transform, has the characteristic to be applicable also on videos from unknown cameras that, consequently, can not be a priori calibrated. We approximated the lens distortion by considering only the lower-order term of the radial distortion. Thus, the method relies on the assumption that pure radial distortion transforms straight lines into curves. The computation of the best value of thedistortion parameter is performed in a multi-resolution way. The method precision depends on the scale of the multi-resolution and on the Hough space's resolution. Experiments are provided for both outdoor, uncalibrated camera and indoor, calibrated one. The stability of thevalue found in different frames of the same video demonstrates the reliability of the proposed method.