基于弹载相机的快速自动曝光算法设计

Design of Fast Automatic Exposure Algorithm Based on Missile Camera

针对弹载相机的工作环境和任务特点,对相机曝光时间、增益与图像亮度信息之间的关系进行理论分析,优化基于固定分区的自动曝光控制算法。利用高斯权重将图像亮度和像素位置紧密关联,并通过多亮度阈值设计增强曝光控制适应范围,降低曝光震荡。同时,对图像过曝状态进行模糊划分,确定不同状态下曝光参数的调整范围。试验结果表明,该算法对不同光照环境的适应性较强,收敛速度快,可在5帧内达到合适曝光,非常适用于弹载相机。

According to the working environment and task characteristics of the missile camera,it analyzes the relationship between the exposure parameters with the image brightness information to optimize the automatic exposure algorithm based on fixed area.Firstly,gaussian weight is used to correlate image brightness and pixel position closely.In order to reducing the exposure shock,different brightness thresholds are set to enhance the adaptive range of the results.At the same time,the overexposure state of image is divided fuzzy,and determine the adjustment range of exposure parameters under different states.The experimental results show that the algorithm can obtain the best exposure parameters within 5 frames quickly,and it is very suitable for missile camera.