The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has ...The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has been embedded into the ERDAS IMAGINE software of version 9.0 and above. The registration accuracies of the module verified for the remote sensing images obtained from different platforms or their different spatial resolution. Four tested registration experiments are discussed in this article to analyze the accuracy differences based on the remote sensing data which have different spatial resolution. The impact factors inducing the differences of registration accuracy are also analyzed.展开更多
An automatic image matching algorithm, and its application to geometric correction of airborne multiangular remote sensed imagery, are presented in this paper. The image-matching algorithm is designed to find correct ...An automatic image matching algorithm, and its application to geometric correction of airborne multiangular remote sensed imagery, are presented in this paper. The image-matching algorithm is designed to find correct match for images containing localized geometric distortion and spectral variation. Mathematical tools such as wavelet decomposition, B-spline, and multi-variant correlation estimator are integrated in the frame of pyramidal matching. The simulated experiment and our practice in correcting airborne multiangular images show that the matching algorithm is robust to the few random abnormal points and can achieve subpixel match accuracy in most area of the image. After geometric correction and registration, multiangular observations for each ground pixel are extracted and sun/view geometry is also simultaneously derived.展开更多
文摘提出了一种基于相位相关法和加速鲁棒特性(SURF:Speeded-Up Robust Features)特征点匹配相结合的序列图像自动拼接算法。首先,利用相位相关法计算归一化相位相关度,通过最大相关度求交进行序列图像的自动排序,并计算得到平移参数;在平移参数指导下,粗估测特征检测感兴趣区域(ROI:Region of Interest)以改进SURF算法进行特征点提取,加快了结合快速最近邻搜索算法和随机采样一致性(RANSAC:Random Sample Consensus)算法的匹配过程的运算速度,提高了稳健性;最后,使用奇异值分解(SVD:Singular Value Decomposition)方法求得相邻图像变换参数,运用帧到拼接图像的思想进行图像拼接并融合得到无缝全景图。实验结果表明,本文算法不但有效地实现序列图像自动排序,与现有算法相比具有更好的实时性,而且合成的全景图具有高清晰度和良好的视觉一致性,具有较好的实用价值。
文摘The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has been embedded into the ERDAS IMAGINE software of version 9.0 and above. The registration accuracies of the module verified for the remote sensing images obtained from different platforms or their different spatial resolution. Four tested registration experiments are discussed in this article to analyze the accuracy differences based on the remote sensing data which have different spatial resolution. The impact factors inducing the differences of registration accuracy are also analyzed.
基金This study was supported by China's Special Funds for Major State Basic Research Project (Grant No. 2000077900) Knowledge Innovation Project of CAS (Grant No. KZCX2-312).
文摘An automatic image matching algorithm, and its application to geometric correction of airborne multiangular remote sensed imagery, are presented in this paper. The image-matching algorithm is designed to find correct match for images containing localized geometric distortion and spectral variation. Mathematical tools such as wavelet decomposition, B-spline, and multi-variant correlation estimator are integrated in the frame of pyramidal matching. The simulated experiment and our practice in correcting airborne multiangular images show that the matching algorithm is robust to the few random abnormal points and can achieve subpixel match accuracy in most area of the image. After geometric correction and registration, multiangular observations for each ground pixel are extracted and sun/view geometry is also simultaneously derived.
