Rapid distortion correction method based on Bayer image

Abstract

The present invention provides a rapid distortion correction method based on a Bayer image. The method comprises the steps of firstly, inputting the Bayer image acquired by a fish-eye lens and a CMOS sensor in an FPGA module, adopting an equidistant internal reference model to map a fish-eye image to a three dimensional spherical surface, utilizing a longitude and latitude mode to describe the three dimensional spherical surface, and obtaining a longitude and latitude coordinate transformation relation of the fish-eye image plane coordinate points and the corresponding mapping points of the three dimensional spherical surface; secondly, adopting a vertical fish-eye projection method to obtain a calculation formula of projecting the mapping points on the three dimensional spherical surface to the corresponding projection points in a two dimensional plane, and projecting the three dimensional spherical surface to the two dimensional plane again; and finally, adopting a transverse scanning interpolation method to transform the two dimensional Bayer image interpolation into a one-dimensional image interpolation, utilizing the multi-channel correlation of the Bayer image to divide an interpolation section into a plurality of segment sections, solving a cubic polynomial curve of the to-be-fitted variables in each section separately to obtain the pixel values of the to-be-interpolated points, and carrying out the interpolation on a corrected two dimensional plane image, thereby improving the Bayer image distortion correction precision.

Description

Technical field [0001] The invention belongs to the technical field of computer vision images, relates to a fisheye image distortion correction method, and particularly refers to a rapid distortion correction method based on Bayer images. Background technique [0002] Fisheye lens has a wider angle of view than ordinary cameras. The application of panoramic vision technology is getting more and more important. Especially in the field of machine vision such as virtual reality, panoramic roaming and image 3D reconstruction, fisheye lens is irreplaceable position. A fisheye lens is an ultra-wide-angle lens with a very short focal length. Its shooting angle can reach or exceed 180°. The manufacture and design of fisheye lenses based on the principle of light refraction generally follow a specific projection model. Take pictures of ultra-wide-angle field of view or scenes to obtain ultra-wide-angle fisheye images. The fisheye image has serious distortion, which does not meet the nee...

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Problems solved by technology

However, the higher the polynomial degree of these methods, the better the correction effect, the greater the calculation amount, the more complicated the process, and cannot meet the actual needs

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