一种高清网络摄像机自动曝光方法

摘要

针对网络摄像机因曝光不准而导致视频图像质量差的问题,提出一种基于图像均匀分块加权的自动曝光方法.该方法将每帧图像均匀分成许多子块,分别对每个子块赋予不同的权重,求出每幅图像亮度的加权平均值并与目标亮度比较,进而选择不同的步长调节曝光参数,并采用TMS320DM368的H3A硬件模块实现该方法.使用柯达灰度板和照度计对曝光做了测试,测试结果表明,采用该曝光方法得到的视频图像质量较好.%To improve the video image of IP camera and make the exporsure accurate, a auto-exporsure method based on uniform partition and weighted is proposed. Each frame image is divided into many same-sized sub blocks in the method,each sub block is given different weight, the weighted average brightness of each image is caculated and compared with the target luminance, then different steps are chosen to adjust exposure parameters. This method is realized by using H3A moudle in TMS320DM368. At last, the exposure is tested by the gray card and illuminome-ter, the test result presents that the auto-exposure method is feasible and the video quality is well.