Compensation Method for Panoramic Image Vignetting

Abstract

The invention discloses a method for compensating the vignetting phenomenon of a panoramic image. Including: obtaining the panoramic image, obtaining the outer contour of the panoramic image, and obtaining the center and radius of the outer contour, iteratively estimating the circumferential area of ​​the obtained panoramic image, obtaining the estimated parameters corresponding to the minimum image entropy, and correcting the parameters according to the iterative estimation According to the existing image, a final compensated panoramic image is obtained; and methods such as iterative estimation, obtaining minimum image entropy, parameter correction and the like are specifically disclosed. The present invention does not need to build a special scene in order to obtain the compensation parameters. Through the method of the present invention, an autonomous compensation method is adopted to optimize the compensation parameters autonomously, and the corresponding compensation coefficients are estimated for specific areas through the initial stage, and the subsequent acquisition The images in the image are corrected sequentially through compensation coefficients, which can quickly and accurately obtain better image restoration effects.

Description

technical field [0001] The invention belongs to the field of computer image processing, in particular to image vignetting processing technology, and in particular to a method for compensating panoramic image vignetting. Background technique [0002] For an optical imaging system, due to the existence of the aperture, the light beam reaching the image plane gradually becomes narrower, which reduces the brightness at the edge of the image. This phenomenon is called vignetting, and the area where the brightness decreases is called a dark edge or dark corner. The vignetting phenomenon distorts the brightness of the picture, which will affect the effect of subsequent image segmentation, image stitching and other image processing. [0003] Panoramic image acquisition is often obtained with a fisheye lens. For a fisheye lens, the angle of view of the lens is wider than that of an ordinary lens, the vignetting phenomenon is more obvious, the brightness attenuation at the edge is mor...

AI Technical Summary

Problems solved by technology

But for fisheye lenses, the viewing angle is greater than 180 degrees, and it is impossible to build a scene where all positions in the lens are uniform white areas, or the cost of building such a scene will be very high

Therefore, this method is limited to a large extent for the vignetting restoration of the fisheye lens, and cannot be applied in actual projects.

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