高动态多光照环境下图像灰度校正方法研究

摘要

在高动态多光照环境下,采集的图像通常存在光照不均匀的现象,需对其进行灰度校正处理.当前图像灰度校正方法无法有效分离高动态多光照环境下图像的目标点与背景点,图像灰度校正效果不佳.为此,提出一种新的图像灰度校正方法,依据Retinex中的照度和反射模型对高动态多光照环境下的图像进行描述,通过投影思想对高动态多光照环境下的图像区域进行分割.针对页白区域,将其置为背景色;针对均匀区,通过全局处理方式对其进行灰度校正处理;针对阴影区域,通过采样法对其进行灰度校正处理,给出高动态多光照环境下图像灰度校正的详细过程.实验结果表明,采用所提方法对图像进行灰度校正处理后,图像质量高,细节丢失少,且处理速度快.%In the high dynamic lighting environment,collection of images often save illumination uneven phenomenon,need to gray scale correction processing.Current image grayscale correction methods can't high effective separation of dynamic lighting environment image of target and background,the image grayscale correction effect is not good.For this,a new method of image grayscale correction was put forward,based on the illumination and reflection in the Retinex model for high dynamic image described how light environment,through the projection ideas for high dynamic lighting environments more area of the image segmentation.Page for the white area,its place as a background color,for uniform area,through a global approach to gray scale correction,in view of the shadow area,through sampling method for gray scale correction,high dynamic lighting environment image grayscale correction process was provided in detail.The experimental results show that the proposed method of image gray level correction processing,high image quality,less detail is missing,and the processing speed is fast.