Method and device for correcting fisheye images

Abstract

The invention discloses a fisheye image correcting method and device. The method comprises the steps that after a correction instruction is received, the position of the center point of an input sub-region which needs to be corrected and is indicated by the correction instruction is determined in a fisheye image; whether the center point of the input sub-region is located in a convergence region is judged, wherein the convergence region is in a region range determined based on the reference input sub-region of the x-axis and / or y-axis of the coordinate system where the fisheye image of the center point is located; if the center point of the input sub-region is located outside the convergent region, the input sub-region is moved along the ligature direction from the center point of the input sub-region to the center point of the convergence region until the center point of the moved input sub-region is located in the convergence region; and the image in the moved input sub-region is corrected. According to the embodiment of the invention, the mathematical model of the convergence region is established according to the imaging characteristics of the fisheye image, so as to reduce the black border region of the corrected fisheye image.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a fisheye image correction method and device. Background technique [0002] With the development of lens and sensor technology, wide-angle cameras with larger field of view are developed. These wide-angle cameras (also known as fisheye cameras) have a wide range of viewing angles, generally up to 220° or 230°. When the viewing angle exceeds 180°, all scenes around the camera can be captured. Such images can be called omnidirectional images, or called a fisheye image. As we all know, the shorter the focal length and the larger the viewing angle, the stronger the distortion caused by the optical principle, so the fisheye image will have serious distortion. Therefore, it is necessary to rectify the fisheye image to reconstruct a plane image that is easily recognized by people. [0003] The effective frame of a fisheye image is a circle, called the original circle. When ...

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Problems solved by technology

[0004] In summary, since the input sub-region to be corrected may not be completely contained in the original circle, black edges will appear on the edge of the corrected image

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