A Fisheye Image Correction Method for Equipment with Angled Side Mounting

Abstract

The invention discloses a method for correcting a fisheye image with an angled side-mounted device, which includes the following steps: extracting the effective range of the fisheye; performing rough correction of barrel distortion on the image; performing angle correction on the image; and performing effective correction on the corrected image. Range cutting; perform cubic Bezier curve back-projection transformation on the image; perform effective range cutting on the resulting image. The present invention can not only maximize the effective area ratio of the original fisheye image obtained, but can also correct the fisheye image obtained when the side belt is mounted at a certain angle, and have a good correction result for the fisheye image. In addition, , the correction method mentioned in the present invention can be used to crop the image content to a minimum, ensuring that the effective monitoring area is maximized.

Description

technical field [0001] The invention relates to an image correction method, in particular to a fisheye image correction method with an angled side-mounted device. Background technique [0002] A fisheye lens is a lens with a focal length of 16mm or less and a viewing angle close to or equal to 180°. It is an extreme wide-angle lens. The fisheye lens is a special kind of lens in the super wide-angle lens, and its vision angle strives to reach or exceed the range that the human eye can see. The super wide-angle feature of the fisheye lens image makes the image captured by the lens give people a very strong perspective effect, but this shocking appeal has to be paid for by very strong image distortion. The result of this distortion is that only the scene in the center of the lens has almost no distortion, and there are serious scene distortions in other places. The rule of this distortion is that the farther away from the center of the lens, the more serious the scene distort...

AI Technical Summary

Problems solved by technology

[0003] The correction method involved in the existing technology has problems such as the farther the image pixel is from the center point, the less ideal the correction effect is, and the effective area of ​​the clipping after correction is too large, and most of them are algorithm designs for full-circle fisheye images.

Chinese Patent Publication No. CN104778656 discloses a fisheye image correction method for spherical perspective projection. It is necessary to calculate the mapping from the acquired fisheye image to the spherical surface. This mapping process is not only computationally intensive, but also mainly aimed at full circle fisheye images.

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