180-degree fisheye image spread method based on concentric algorithm and device

Abstract

The invention discloses a 180-degree fisheye image spread method based on a concentric algorithm and a device. The method comprises two steps as follows: fisheye camera calibration and camera distortion correction, wherein in the first step, an image obtained from an image sensor is supposed to be a part of a standard circle, and the standardization operation of the image is completed through the matching for an image edge arc-shaped area; in the second step of the algorithm, distortion of the fisheye image in a radial direction is ignored, distortion of the image in a tangential direction is merely considered, a circular arc BTB' on a central line of a circular center o' is enabled to correspond to one row of a spread rectangular image, and the shot fisheye all-around image is spread to be a rectangular panoramic image suitable for human eye browsing habits. Meanwhile, the invention discloses a 180-degree fisheye imaging device based on the concentric algorithm, and the device comprises a wall-mounted gun type panoramic camera, a monitor and external control equipment.

Description

Technical field: [0001] The invention relates to the field of image processing and omnidirectional vision, in particular to a method and device for expanding a 180-degree fisheye image based on a concentric circle algorithm. Background technique: [0002] Panoramic image / video has been widely researched and applied in the fields of panoramic video surveillance, robot visual navigation, and virtual reality space construction due to its 180-degree omnidirectional viewing angle and the advantages of being able to cover a wide range of scenes. 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 disto...

AI Technical Summary

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 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, and based on The spherical model and the fisheye lens correction method based on the cylindrical model have large deformation at the edge and complex transformation processing. A 180-degree fisheye image expansion method and device based on the concentric circle algorithm is proposed.

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