应用相位相关法的TDICCD空间相机像移测量方法

空间相机亚像素精度的像移高精度测量是一项技术难题。文章针对高分辨率TDICCD空间相机的成像特点提出一种直接测量像移的方法,该方法利用高速图像传感器获取图像序列,然后采用基于局部上采样的相位相关法来测定亚像素像移变化曲线。Matlab软件的仿真实验结果表明,该方法对图像噪声和灰度变化有很高的容忍度,其测量精度在图像信噪比高于10dB时优于0.1个像元。

TDICCD Space Camera Image Motion Measurement Based on Phase Correlation

Obtaining image motion information during space camera imaging for real-time compen- sation for hardware or post-time restoration is an important means to improve resolving power of high-resolution space camera. Achieving high measurement precision of sub-pixel is always a technical problem. According to the imaging characters of high-resolution TDICCD camera, this paper proposes a method to directly measure image motion. The method uses high-speed image sensor to acquire image sequence, and then adopts phase correlation algorithm based on the local frequency sampling to determine the sub-pixel image motion curve. Matlab simulation experi- ments show that the method has high tolerance of image noise and grayscale change,and its meas- urement accuracy is better than 0. lpixel when the SNR of images is higher than 10dB.