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Dynamic tracing and trace replay are two main functions in vehicle monitoring system of GIS. Based on the idea of line-to-point set, "point-to-point" road matching algorithm and "Trace interpolation" trace replay algorithm are designed and implemented. The main idea of "Point-to-point" is that the road will be separated into a series of discrete set points, and then got...
This paper provides a novel content-based image retrieval algorithm based on ROI (Region Of Interest) by using SIFT (Scale Invariant Feature Transform) feature matching. SIFT descriptors, which are invariant to image scaling and transformation and rotation, and partially invariant to illumination changes and affine, present the local features of an image. Therefore, feature keypoints can be extracted...
Video key frame extraction is a type of video abstraction, which is one of the key problems in video content indexing and retrieval. Key frame extraction aims at finding a small collection of salient images extracted from a video sequence for visual content summarization. In this paper we propose a video key frame extraction method based on spatial-temporal color distribution. First we construct a...
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