基于图像直方图统计的CCD相机自动调光算法

Auto-exposure Algorithm for CCD Camera Using Image Histogram

在一些特殊应用场合,CCD相机成像时具有场景不可重复、应用环境多样性等特点,使得自动调光成为一个研究难点。针对该问题提出了一种基于图像直方图统计的自动调光算法。该算法首先分析一帧图像的亮度分布,并计算出下一帧图像的最佳均值。然后根据该均值调整下一帧图像的曝光量,使其合理曝光。实验表明,利用此方法可以获得整体亮度合适的图像,同时此方法具备较好的场景适应能力,满足场景时刻变化时CCD相机自动调光的需求。

In some special applications, CCD cameras may face kinds of different and changing scenes, so automatic exposure becomes to be a key problem in research. An effective automatic exposure algorithm based on image histogram is proposed in this paper. Firstly, it needs to analyze the luminance distribution of one frame image and account the optimal mean of the next image. Then, the exposure value （EV） will be adjusted based on the optimal mean to gain a rational exposure. The experimental results show that images obtained by the proposed algorithm present appropriate brightness, proving that the algorithm not only has a good capability to adapt to various scenes, but also it can meet the requirement of automatic exposure of CCD cameras.