Fisheye image spread method based on radial characteristics

Abstract

The invention discloses a fisheye image spread method based on radial characteristics. According to the method, radial distortion of an all-around fisheye image is merely considered, but tangential distortion is not considered. The method comprises the steps as follows: a long axis R and a short axis r of a transformed image are determined according to a structure of a shot image; then any row on a spread rectangular panoramic imaging corresponds to a radius on the all-around fisheye image, and a fisheye transformation formula is utilized to correct the distortion in a radial direction; and finally, a rectangular two-dimension panoramic imaging which is suitable for human eye browsing habits is output. The method disclosed by the invention prevents the problem of larger edge distortion of an original all-around image, eliminates radial distortion of the image, improves image quality and visual effect of a panoramic spread image, controls image deformation, and ensures the maximum utilization ratio of usable information simultaneously.

Description

Technical field: [0001] The invention relates to the fields of image processing and omnidirectional vision, in particular to a fisheye image expansion method based on radial features. Background technique: [0002] With the advantages of 360-degree omnidirectional viewing angle and the ability to cover a wide range of scenes, panoramic image / video has been more and more widely researched and applied in the fields of panoramic video surveillance, robot visual navigation, and virtual reality space construction. Fisheye omnidirectional imaging is an important way to obtain panoramic images. However, due to the special design of the fisheye camera, the shorter the focal length, the larger the viewing angle; the larger the viewing angle, the stronger the deformation caused by the optical principle. The scene that should be horizontal or vertical has changed accordingly, so the omni-directional image obtained by the fisheye camera is seriously distorted. To effectively use image...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: for the specific problem of developing a fisheye omnidirectional image into a cylindrical panoramic image, in order to eliminate the adverse effects of the installation error and distortion of the lens of the omnidirectional imaging device on the omnidirectional image development process, As well as the problem of large deformation at the edge and complex transformation processing of the fisheye lens correction method based on the spherical model and the cylindrical model, an omnidirectional fisheye image expansion method based on radial features is proposed, by accurately calculating the circular omnidirectional The radial distortion of the image, ignoring the tangential distortion, performs a one-way transformation on any pixel on the image to obtain a rectangular two-dimensional panoramic image suitable for human viewing habits

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