线阵推扫式CCD亚像元成像的列向动态调制传递函数  

Transverse dynamic modulation transfer function of subpixel push-scanning imaging by linear CCD

作　　者：王凌[1] 徐之海[1] 冯华君[1] 李奇[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第2期317-320,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60577047)

摘　　要：采用亚像元成像技术对焦平面上彼此错开1/2像素的CCD获得的初始图像进行合成,获得分辨率为初始图像2倍的新图像.在CCD采样时间内目标高速运动所引起的像与CCD之间的列向相对位移会导致成像质量的下降.从调制传递函数(MTF)的定义出发,引入像与CCD之间的相对运动速度,推导出了线阵推扫式CCD亚像元成像列向动态MTF的理论公式.对一种CCD的MTF进行具体的数值计算,结果表明亚像元成像技术能够有效地提高线阵推扫式CCD的列向成像质量.Subpixel imaging technique can reconstruct a new image whose resolution is twice times higher than the original images obtained by two CCDs with 1/2 pixel shift. The relative shift between the images and the CCD attributing to the high speed movement of an object degenerates the image quality. By introducing the velocity of relative movement into the model, the transverse dynamic modulation transfer function （MTF） of subpixel push-scanning CCD imaging was deduced from the definition of MTF. The results of numerical computation for the MTF of a CCD sensor show that the subpixel imaging technique can improve the transverse imaging quality of the linear push-scanning CCDs.

关 键 词：遥感CCD 亚像元成像 调制传递函数(MTF) 成像质量 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]