Panoramic image vignetting phenomenon compensation method

Abstract

The invention discloses a panoramic image vignetting phenomenon compensation method. The method comprises the steps: obtaining a panoramic image, obtaining the external contour of the panoramic image, obtaining the center and radius of the circle of the external contour, carrying out the iterative estimation of a circumferential region of the obtained panoramic image, obtaining an estimation parameter corresponding to a minimum image entropy, correcting an existing image according to the parameter obtained through iterative estimation, and obtaining a finally compensated panoramic image. The invention specifically discloses methods for iterative estimation, minimum image entropy obtaining and parameter correcting. The method does not need to build a special scene for obtaining a compensation parameter. The method autonomously optimizes the compensation parameter through employing an autonomous compensation method, estimates a compensation coefficient at an initial stage for a specific region, carries the correction of the subsequently obtained image through the compensation coefficient, and can obtains a better image restoration effect quickly and accurately.

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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