【摘要】 为了研究使用联合变换相关器测量空间相机像移时噪声对测量精度的影响,分别对相关器加入背景噪声和图像噪声,通过仿真得到5种不同处理方法在不同噪声水平下的测量误差,并利用搭建的实验平台验证了使用联合变换相关法测量空间相机像移的有效性。结果表明,相比于其它相关器处理方法,使用功率谱相减并以0值为阈值二值化的方法得到的像移测量精度较高,即使对于SNR=1的输入图像,在含有背景噪声时,像移测量误差不大于0.12个像元,完全满足空间相机的使用要求。更多还原

【Abstract】 To research the influence of the noise on the measurement accuracy of the image motion of the space camera when using the optical joint transform correlator(JTC),the background noise and the pattern noise are added to the JTC respectively firstly.Then the measurement errors at different noise levels for the five kinds of different processing methods are emulated,and the validity of the image motion measured by the JTC is verified by an experimental platform.The results show that the measurement accuracy for the method of power spectrum subtraction and binaryzation with zero threshold is better compared with the other processing methods,the measurement error is no more than 0.12 pixel for the input image with SNR=1 and the background noise,thus meeting the operating requirement of the space camera completely.更多还原