大面阵数字航测相机像面照度改正算法  

Correction of illumination of digital large camera

作　　者：王悦[1,2] 许仕珍[2,3] 张魁珂 于相鹏 

机构地区：[1]65015部队 [2]78138部队 [3]信息工程大学测绘学院

出　　处：《测绘工程》2009年第3期17-20,共4页Engineering of Surveying and Mapping

基　　金：国家863资助项目(2001AA131010)

摘　　要：在大面阵数字航测相机的使用过程中,由于视场角较大,存在着获取的影像光照不均匀的问题。为得到理想的结果,必须对航摄相机的影像进行匀光处理。分析光照度不均匀产生的原因,得到由中心向四周的变化与cos4ω成正比,确定光照度的改正模型。并使用直接匀光法对像片进行处理,得到理想的结果。然后根据实际工程应用的需要,结合马斯克匀光理论,使用模版匀光的方法,简化处理过程。并运用反差同步改正的方法提高图像的质量。最后对两种方法处理的时间进行比较,模版匀光方法大幅提高工作的效率。When getting images from digital large color camera, because of the large view angle, a problem that the illumination is uneven exists. In order to get the best result, it is necessary to do image dodging. This paper analyzes the cause of this problem, gets the model of and confirms the corrective model. Then the programme produces the images with direct dodging and acquires good result. Afterwards according to the application of engineering, we predigest the process course with MASK dodging theory and stencil dodging. And then on the base of this, we use simultaneous corrective the contrast to improve the quality of the images. Finally through comparing the time of two methods, it is easy to know that stencil dodging enhances the efficiency of work.

关 键 词：大面阵彩色CCD数字航测相机 图像匀光 马斯克匀光理论 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]