Method for removing sunspot regions in image, image processor and photographing device

Abstract

The invention discloses a method for removing sunspot regions in an image. The method comprises the steps of acquiring a current frame image; and determining a dark region in the current frame image according to the brightness value of the pixel points in the current frame image, wherein the pixel points are determined to be in the dark region when the brightness value of the pixel points is smaller than the threshold value of the dark region, and generating a sunspot identification signal; calculating the length of each row of the dark region according to the sunspot identification signal, and taking the sum of the length of each row of the dark region and the transition threshold value as the length of the sunspot region of the row; determining the diameter of the sunspot region according to the length of the sunspot region of each row; determining the center coordinate according to the coordinate value of the sunspot region where the diameter is located; determining the sunspot region according to the diameter and the center coordinate in the next frame of the image, and removing the sunspot region in the next frame of the image. According to the method, no transition region residue exists when the sunspot region is removed, and the image effect is better. The invention further discloses an image processor and a photographing device.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for removing sunspot areas in an image, an image processor and a photographing device. Background technique [0002] When the image sensor takes pictures towards a brighter point such as the sun, due to the pixel unit and structure of the image sensor, when the image sensor is used under strong light, bright spots will appear. For example, the center of the sun is a very dark circle, while the sun The phenomenon of very bright surroundings is called the sunspot phenomenon. The characteristic of the sunspot phenomenon is that the pixel area around the sun is very bright, and the R, G, and B values ​​in this area are very large and close to 255. The pixel area inside the sun is very dark, and the R, G, and B values ​​​​in this area are very small and close to 0. From the very bright pixel area to the very dark pixel area, there is a transition area o...

AI Technical Summary

Problems solved by technology

[0004] However, the transitional area cannot be accurately judged by using the small brightness of the center of the sunspot and the high brightness around the sunspot to judge the black area of ​​the sunspot; moreover, the identification signal of the sunspot is used to remove the sunspot area, because the transitional area cannot be accurately judged , so after the sunspot area is removed, a part of the transition area will remain, making the image effect poor

Images