A Fast Stitching Method for Cube Panorama

Abstract

The invention discloses a method for quickly stitching a panoramic image of a cube. The method herein includes the following steps: arranging a panoramic camera, simultaneously photographing a front space in the front, rear, left, right, above and below directions; calibrating the panoramic camera, acquiring a distortion correction parameter, further acquiring a linear transformation parameter and a cropping parameter of respective image; photographing scenes by using the panoramic camera, firstly conducting distortion correction on a camera lens by using the distortion parameter, then conducting rotation transformation and transverse transformation on each image by using the linear parameter; cropping the obtained 6 images in the centers in accordance with the cropping parameter, such that the 6 images are approximately the same in size and have a visual angle of 90 degrees in the horizontal direction and the vertical direction, and eventually, separately placing the squares which are obtained by cropping the 6 images at places where the panoramic image of a plane cube and the photographing camera correspond. According to the invention, the method only requires one time calibration process, can repeatedly use calibration parameters, simplifies the stitching process, accelerates the stitching speed, and saves great stitching time.

Description

technical field [0001] The invention relates to the field of image splicing, in particular to a fast splicing method for cube panoramas. Background technique [0002] A panorama refers to a full-view image with a horizontal viewing angle of 360 degrees and a vertical viewing angle of 180 degrees. According to the display mode, panoramas are mainly divided into spherical panoramas, cylindrical panoramas, and cubic panoramas. The current mainstream panoramas generally use spherical panoramas or cubic panoramas as sources when displaying them, but the splicing method mainly adopts the splicing and fusion method of spherical panoramas. To adopt the cube panorama display method, the spherical panorama generated by splicing needs to be converted into a cube panorama and then displayed. The existing panorama stitching process mainly includes image acquisition, lens distortion correction, image matching, image stitching, image fusion and other processes. There are mainly the foll...

AI Technical Summary

Problems solved by technology

[0003] 1. It is difficult to collect: In order to obtain high-definition panoramas, in addition to using professional panoramic equipment, the photos are generally obtained by turning a single high-definition camera to shoot in different directions, so that there is enough overlapping area between two adjacent pictures and each picture is taken The optical centers of the lens should be gathered together as much as possible when taking pictures, which has certain technical requirements for the photographers

[0004] 2. Distortion correction is difficult: the resolution of a panorama is determined by the resolution of a single picture and the number of pictures. In order to reduce the number of lenses used without reducing the resolution of the panorama, an ultra-wide-angle lens or a fisheye lens is generally used

If you do not use a fixed camera to shoot, you must correct each lens individually every time you stitch together, which is time-consuming and not conducive to improving stitching efficiency

[0005] 3. Stitching is difficult: when stitching existing panoramas, each image needs to be corner detected first, and then corner matching and registration are performed

In this way, since each stitching needs to calculate the stitching parameters corresponding to the current picture, this process requires a lot of computing resources and time.

[0006] 4. Difficulty in fusion: in order to eliminate overlapping areas, image fusion is required

If the overlapping area of ​​two adjacent images is larger, the correct rate of corner point matching in the stitching process will be higher, but the fusion will be more difficult, and the corresponding fusion will take longer

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