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为提高便携式多波段相机在宽照度环境下的拍摄需求,针对传统多区域均值加权曝光时间调节算法中图像灰度参考均值的取值范围对调光性能影响大的问题,提出了一种基于便携式多波段相机的多区域均值加权调光和图像信息熵调光相结合的调光方法。系统采用多区域均值加权调光方法,实现了过高或过低图像灰度情况下的快速调光;利用图像信息熵调光方法,解决了传统调光算法中超调振荡问题,提高了便携式多波段相机的照度环境适应性;进行了基于便携式多波段相机的调光实验,调光时间为31 ms,消除振荡时间约为180 ms。实验结果表明,利用多区域均值加权和图像信息熵相结合的调光算法可快速、稳定地选择合适的曝光时间,获得更好的多波段拍摄结果。
In order to improve the shooting demand of portable multi-band camera under the environment of wide illumination, aiming at the problem that the value range of the reference gray value of image in the traditional multi-region weighted average exposure time has a great influence on the dimming performance, a portable Multi-region camera weighted weighted dimming and image information entropy dimming combined dimming method. The system adopts the method of multi-region mean weighted dimming to achieve fast dimming under the condition of too high or too low image grayscale. By using the image information entropy dimming method, the problem of overshoot in the traditional dimming algorithm is solved and the advantages of portable multi- Band camera illumination adaptability; carried out based on portable multi-band camera dimming experiment, dimming time is 31 ms, eliminating the oscillation time of about 180 ms. The experimental results show that the dimming algorithm using multi-region mean weighting and image information entropy can quickly and stably select the appropriate exposure time to obtain better multi-band shooting results.