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When register a pair of remotely sensed images with very different spatial resolution, the diversity of their shape and tone results in lower precision and success rate. The paper proposes an algorithm of moveably resampled template match to fine register them, which resamples the high-resolution images to a sub-image by a movable mask plate, and then uses template matching method to register the...
We present an approach based on novel structure called Multi-approximate R-tree (MR-tree) to performing the K-Nearest Neighbors (KNN) query efficiently and accurately in this paper. Maximal Enclosed Circle (MEC) is introduced to express an object approximately with Minimum Bound Rectangle (MBR). The introducing of the MEC improves the accuracy of the approximate expression of the spatial objects....
The nearest neighbor query, to And the spatial entity whose distance to the given object, is a kind of basic operation on spatial dataset and used frequently in GIS. The DSB-tree adopts minimum bounding circle and maximum enclosed circle together to express the spatial entity approximately as a variation of SS-tree. Massive computing and comparisons on distance are necessary to the nearest neighbor...
Using approximate geometrical expression to construct spatial data index becomes to an effective method because of the complexity of spatial entity. The simple exterior approximate expression could not satisfy the multiple query requirements to the spatial dataset. Obvious distance and topology relationships can be found between spatial data, especially the two or three dimensions spatial data used...
Due to the fact that most two-dimensional fabric of coarse-grained soil models are not accurate, the three-dimensional model is needed. An algorithm based on the improved ray casting volume rendering is proposed for reconstructing the three-dimensional model of the fabric of coarse-grained soil. This method improves the algorithm by making adaptive threshold segmentation preprocessing of the original...
Since there are mass of images in the outward-appearance patent-image database, a retrieval approach developed for this database is greatly demanded. The shape information of the patent image is the key feature for a patent image. Therefore, we present an outward-appearance patent images retrieval approach based on contour-description matrix. This matrix represents the 2D shape feature and shows the...
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