Low-distortion three-dimensional picture outer polar line correcting method

Abstract

The invention discloses a low-distortion three-dimensional picture outer polar line correcting method. According to the low-distortion three-dimensional picture outer polar line correcting method, the process that outer polar lines are corrected to be parallel to the x axis of a picture coordinate system is divided into the two steps that the outer polar line of a left view and the outer polar line of a right view are corrected to be mutually parallel and the outer polar line of the left view and the outer polar line of the right view are corrected to be parallel to the x axis of the picture coordinate system. In order to reduce the projection distortion caused by the outer polar line correction process, one of the left view and the right view of a three-dimensional picture is kept unchanged, correction is only carried out on the other view, and the method that rotation is replaced by vertical displacement is adopted. According to the low-distortion three-dimensional picture outer polar line correcting method, parallax difference optimization is further carried out, and therefore the consistency of parallax information of the three-dimensional picture before correction and the three-dimensional picture after the correction is ensured. The low-distortion three-dimensional picture outer polar line correcting method solves the projection distortion problem caused by the traditional three-dimensional correction algorithm to the great degree, the corrected three-dimensional picture with small distortion can be obtained, and the consistency of the parallax information before the correction and the parallax information after the correction can be ensured.

Description

technical field [0001] The present invention relates to a new method for correcting the epipolar lines of stereoscopic images, in particular to a new method for eliminating the vertical parallax of stereoscopic images without calibration, reducing distortion and maintaining the consistency of parallax information before and after correction. method. Background technique [0002] The left and right views of the stereo image satisfy the epipolar constraint: corresponding to a certain point P in the three-dimensional space, its image point on the left view is p L , then its matching point p on the right graph R (that is, the image point of the three-dimensional point P on the right view) must be located by p L Determined on an epipolar line on the right view. [0003] The so-called epipolar line correction refers to generating a virtual image pair by performing projective transformation on the two images so that the epipolar lines are parallel to the coordinate axes. If the...

AI Technical Summary

Problems solved by technology

However, for usual stereoscopic images, the constraint of rigid body transformation alone is not enough

Because a rigid body transformation with an improper rotation component can also cause severe distortion of the perspective of the stereo image

[0005] For stereoscopic images, another problem that existing epipolar line correction algorithms ignore is the parallax distortion caused by the correction process

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