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Otsu adaptive thresholding is widely used in classic image segmentation. Two-dimensional Otsu thresholding algorithm is regarded as an effective improvement of the original Otsu method. To reduce the high computational complexity of 2D Otsu method, a fast algorithm is proposed based on improved histogram. Two-dimensional histogram is projected onto the diagonal, which forms 1D histogram with obvious...
A DCT-domain based character detection algorithm is proposed for video stream. It utilizes the directional features of the texture in character blocks and the property that the characters in video usually distribute in row or column. The character/non-character blocks are effectively separated by a new adaptive threshold, then the noise and false text regions are further removed by morphological operation...
In this paper, integrating boundary and region information of medical images, we propose a novel hybrid segmentation method based on level set. The main contributions of this paper are to modify the velocity function for the boundary-based level set method, and to design a novel energy function as a stopping criterion. This velocity function is modified according to the statistical characteristics...
A novel image decomposing algorithm is proposed in this paper, it can separate images into texture and cartoon parts under the complicated background. The main idea is the use of two appropriate dictionaries, one for the representation of textures, and the other for the cartoon parts assumed to be piecewise-smooth. The cartoon parts in the image can be sparsely represented by the local ridgelet and...
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