多区域图像的快速自动曝光控制方法

Multi-area Image Fast Automatic Exposure Control Method

根据CCD摄像机的成像原理,充分考虑地球大气对宇宙星体辐射的吸收衰减作用,引入了多区域图像曝光时间调节因子,推导得到了多区域图像曝光时间与外界光照变化的关系模型,解决了目前方法存在的弊端;利用CIS的感光特性,根据多区域图像当前的曝光时间、增益值和曝光输出值判断出当前多区域图像的光照强度,设置多区域图像的快速自动曝光控制的基本参数,根据多区域图像的外界光照强度范围查找表,判断多区域图像曝光强度值是否在目标曝光强度值范围内,对多区域图像的自动曝光时间与亮度增益值进行调节,实现曝光控制.实验结果证明,所提方法能够实现多区域图像的快速自动曝光控制,保留了细节信息,稳定性较好.

According to the imaging of the CCD camera Principle, taking full account of the Earth＇s atmosphere on the absorption and attenuation of the radiation of the universe, the introduction of a multi-regional image exposure time adjustment factor derived multi-region image exposure time and external light changes in the relationship between the model to solve the shortcomings of the current method; CIS based on the current multi-region exposure time, gain and exposure output value to determine the current multi-region image illumination intensity, set the multi-region image of the rapid automatic exposure control basic parameters, according to the multi-region image of the external light Intensity range look-up table to determine whether the multi-region image exposure intensity value is within the target exposure intensity value, and adjust the automatic exposure time and the brightness gain value of the multi-region image to realize the exposure control. The experimental results show that the proposed method can realize the rapid automatic exposure control of multi-area images, retain the details and the stability is good.