一种自适应快速曝光控制方法

针对在快速运动中连续高速地获取高质量的图像信息,提出了一种基于光圈优先的自动曝光控制方法。通过对初始图像的评估,确定当前景物亮度下最佳光圈大小,进而获得此光圈下不同景物亮度的曝光时间,由此建立景物亮度与曝光时间的关系模型。在实际运用中根据关系模型,通过跟踪当前景物亮度动态调整曝光时间以达到获取最佳曝光量的目的。该方法具有实时、快速、成像质量高和控制精确可靠的特点,并在实际应用中得到验证。

A control algorithm for adaptive and rapid exposure

For high-speed and continuously accessing the high-quality image information in rapid movement, an automatic exposure control method based on aperture priority was proposed in this paper. The optimal size of aperture in current scenery brightness was determined from evaluation of initial image, and then the exposure time of this aperture in diverse scenery brightness was obtained. The relationship model between exposure time and scenery brightness was established at last. The optimum exposure can be obtained according to this relational model, and dynamic adjustment of the exposure time can be realized through tracking current scenery brightness. The practice shows that this method has advantages of real-time, fast, high imaging quality and accuracy.