高精度光电混合联合变换相关的亚像元像移测量  

High-Accuracy Measurement of Sub-Pixel Image Motion Based on Hybrid Photoelectirc Joint Transform Correlator

作　　者：洪雪婷[1,2] 钱义先[1,2] 

机构地区：[1]浙江师范大学数理与信息工程学院,浙江金华321004 [2]浙江省光信息检测与显示技术研究重点实验室,浙江金华321004

出　　处：《光学学报》2015年第2期165-171,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61377014);浙江省自然科学基金(LY12F05001)

摘　　要：为更精确测量出卫星遥感相机因姿态变化和振动等原因引起的亚像素像移,提出了基于光电混合联合变换相关的像移测量方法。该方法通过对采集到的图像序列做光学相关运算,并对联合功率谱做拉普拉斯变换,得到尖锐的相关峰,再用质心法获取相关峰的坐标信息,从而测得更精确的图像像移值。阐述了基于光电混合联合变换相关的图像像移测量原理,搭建了相应的光学实验装置。实验结果表明,该方法的像移测量误差低至0.03 pixel,大大提高了图像像移的测量精度。To measure the sub-pixel image motion which is caused by satellite attitude instability and vibration, an effective approach to measure image motion is presented based on Hybrid Photoelectire joint transform correlator. Firstly, captured image sequences are optically calculated by joint transform correlator, then the acquired joint power spectrum is processed by Laplace transform, an improved correlation peak is obtained. Lastly, a modified centroid algorithm is proposed to get more accurate motion measurement. Motion measurement based on optical correlation is discussed, and the optical experimental system is also set up. The experimental results show that the measurement error is as low as 0.03 pixel, the accuracy is improved greatly.

关 键 词：测量 傅里叶光学 像移测量 光学相关器 拉普拉斯变换 

分 类 号：TP751.2[自动化与计算机技术—检测技术与自动化装置]