This paper will discuss strategies for trinocular image rectification and matching for linear object tracking.It is well known that a pair of stereo images generates two epipolar images.Three overlapped images can yie...This paper will discuss strategies for trinocular image rectification and matching for linear object tracking.It is well known that a pair of stereo images generates two epipolar images.Three overlapped images can yield six epipolar images in situations where any two are required to be rectified for the purpose of image matching.In this case,the search for feature correspondences is computationally intensive and matching complexity increases.A special epipolar image rectification for three stereo images,which simplifies the image matching process,is therefore proposed.This method generates only three rectified images,with the result that the search for matching features becomes more straightforward.With the three rectified images,a particular line_segment_based correspondence strategy is suggested.The primary characteristics of the feature correspondence strategy include application of specific epipolar geometric constraints and reference to three_ray triangulation residuals in object space.展开更多
Recently,a novel three-image algorithm has been proposed to retrieve the sample’s absorption,refraction,and scattering properties in x-ray analyzer-based imaging.The feasibility of the three-image algorithm was valid...Recently,a novel three-image algorithm has been proposed to retrieve the sample’s absorption,refraction,and scattering properties in x-ray analyzer-based imaging.The feasibility of the three-image algorithm was validated by synchrotron radiation experiments.However,it is unclear yet whether the estimated refraction and scattering signals are biased or not and how the analyzer angular position affects the biases in the estimated signals.For this purpose,the biases of the extracted refraction and scattering signals are theoretically derived for the three-image algorithm.The theoretical models are further confirmed by numerical experiments.The results show that both the estimated refraction and scattering signals are biased,and the biases are strongly dependent on the analyzer angular position.Besides,the biases also show dependence on the sample’s refraction and scattering properties locally.Those results can be used as general guidelines to optimize experimental parameters for bias reduction and accurate imaging of different features within the sample.展开更多
文摘This paper will discuss strategies for trinocular image rectification and matching for linear object tracking.It is well known that a pair of stereo images generates two epipolar images.Three overlapped images can yield six epipolar images in situations where any two are required to be rectified for the purpose of image matching.In this case,the search for feature correspondences is computationally intensive and matching complexity increases.A special epipolar image rectification for three stereo images,which simplifies the image matching process,is therefore proposed.This method generates only three rectified images,with the result that the search for matching features becomes more straightforward.With the three rectified images,a particular line_segment_based correspondence strategy is suggested.The primary characteristics of the feature correspondence strategy include application of specific epipolar geometric constraints and reference to three_ray triangulation residuals in object space.
基金National Natural Science Foundation of China(Grant Nos.U1532113,and 11475170)the Fundamental Research Funds for the Central Universities,China(Grant No.PA2020GDKC0024).
文摘Recently,a novel three-image algorithm has been proposed to retrieve the sample’s absorption,refraction,and scattering properties in x-ray analyzer-based imaging.The feasibility of the three-image algorithm was validated by synchrotron radiation experiments.However,it is unclear yet whether the estimated refraction and scattering signals are biased or not and how the analyzer angular position affects the biases in the estimated signals.For this purpose,the biases of the extracted refraction and scattering signals are theoretically derived for the three-image algorithm.The theoretical models are further confirmed by numerical experiments.The results show that both the estimated refraction and scattering signals are biased,and the biases are strongly dependent on the analyzer angular position.Besides,the biases also show dependence on the sample’s refraction and scattering properties locally.Those results can be used as general guidelines to optimize experimental parameters for bias reduction and accurate imaging of different features within the sample.
