中国激光, 2020, 47 (3): 0304003, 网络出版: 2020-03-12   

强度叠置联合变换相关像移测量方法 下载: 873次

Image Motion Measurements Based on Intensity Superimposition and Joint Transform Correlation Approach
作者单位
中国科学院西安光学精密机械研究所空间光学技术研究室, 陕西 西安 710068
摘要
为了实现像移测量装置的高速、高精度和小型化,提出一种改进的联合变换相关方法。该方法使用两幅待检测图像强度叠加的方式构造相关输入图像,利用卫星推扫运动所产生的系统像移实现自相关峰和互相关峰在空间上的分离。用于相关运算的图像被缩小到与待检测图像尺寸相当,大幅度降低了测量过程的计算量,从而有利于高速数字联合变换相关器的实现。仿真和实验测试结果表明:所提方法保持了传统联合变换相关像移测量方法的高精度、抗噪声能力强和对图像纹理不敏感的特点,并具有实现高速像移测量的潜力。
Abstract
To achieve high speed, high precision, and device miniaturization, an improved joint transform correlation (JTC) method is proposed. In this method, the correlation input image is constructed by superposing the intensity of two images to be detected. To effectively separate autocorrelation and cross correlation peaks, the method makes use of the constant image motions resulting from satellite movement. The size of each image used for the correlation operation is reduced to the size of the image to be detected, which greatly reduces the calculation of the measurement process, which is beneficial for realizing high-speed digital joint transform correlation. The simulated and experimental results show that the new method maintains the advantages of high accuracy, high robustness to image noise and low dependency on image texture of traditional JTC. Additionally, it also has the potential for high-speed image motion measurements.

易红伟, 李旭阳, 贺天兵, 陈荣利. 强度叠置联合变换相关像移测量方法[J]. 中国激光, 2020, 47(3): 0304003. Yi Hongwei, Li Xuyang, He Tianbing, Chen Rongli. Image Motion Measurements Based on Intensity Superimposition and Joint Transform Correlation Approach[J]. Chinese Journal of Lasers, 2020, 47(3): 0304003.

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