面阵CCD微光像感器图像的校正

在基于面阵 CCD像感器的数字射线成像 ( DR)检测系统中 ,CCD相机的信噪比严重地制约着系统检测精度的提高。为了提高 CCD相机的信噪比 ,本文分析了 CCD数码相机产生的噪声特性 ,发现 CCD暗电流和 CCD不同像素之间对光响应不一致性是影响图像质量的两个主要原因。并在对暗电流和像素间光响应的不一致性特点、性质分析的基础上提出了相应的校正算法 ,最后对一幅实际拍摄的图像进行了校正。

THE CORRECTION OF IMAGE PHOTOGRAPHED BY CCD IMAGE SENSORS

In a digital radiograph(DR) inspection system based on area CCD sensors, the inspection precision is limited severely by the signal noise ratio of CCD sensor chips In order to upgrade the SNR of CCD sensors, the characteristics of noise caused by CCD camera is studied It is discovered that dark current and the non uniformity of the response to light in different pixels of CCD sensors are the two important factors that affect the quality of images Relevant correction algorithms are proposed Finally, an actual image is corrected