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The estimation of road profiles from low texture stereo images is a problematic task because the disparity images computed from such class of images have a large number of noisy disparities. This paper presents a new method that is based on edge maps to guide the cost aggregation process in the stereo matching problem. Using the proposed aggregation method, the disparity images are smooth at low texture...
Computing disparity images for stereo pairs of low texture images is a challenging task because matching costs inside low texture areas of the stereo pairs are almost similar. This problem can not be solved straightforwardly by increasing the size of aggregation windows or by using global optimization methods, e.g. dynamic programming, because those approaches will smooth depth discontinued boundaries...
Image-based 3D reconstruction is a useful and active research area. However, it is a challenge to compute 3D measurements in real-time for high resolution input images even if special hardwares are used. This paper proposes a new coarse-to-fine method that can reduce the computation time of the stereo matching problem. The time reduction is done by sampling disparity spaces and computing the matching...
This paper proposes a new similarity measure for the content-based image retrieval (CBIR) systems. The similarity measure is based on the multidimensional generalization of the Wald-Wolfowitz (MWW) runs test and the k-means clustering algorithm. The performance comparisons between the proposed method and the current CBIR method based on MWW runs test were performed, and it can be seen that the proposed...
A micro-macro bilateral system consists of master and slave system of different sizes. Thus, it is vital for the micro- macro bilateral control to use appropriate scaling factors of position and force responses, And the appropriate control gains should be used according to the scaling gains. The proposed method is designed based on ideal reproducibility and ideal operationality of micro-macro bilateral...
In this paper, we propose an improved wavelet- based watermarking method using the mathematical morphology. The wavelet coefficients of host image are firstly selected as the significant coefficients by a statistical predetermined threshold. The mathematical operations are then performed to tame some small perturbations on the selected coefficients caused by the manipulations or attacks. Moreover,...
The color correlogram is a simple statistical descriptor of a color image that has been widely used for content-based image retrieval (CBIR) systems. To measure similarity between two images using the correlogram, the traditional approaches use the relative distance. In this paper, to improve performance of the CBIR systems, the inner product metric is used to measure similarity of images instead...
Optical forces acting on a sphere were experimentally analyzed to investigate the single-beam fiber optic trap using a cleaved optical fiber or a lensed optical fiber. A stable optical trap could be created at the point where the x-directed (horizontal) optical forces were precisely balanced, and the vector sum of axial and transverse forces acting on a sphere gave a restoring force directed back...
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