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Morphological changes of retinal vessels such as arteriovenous (AV) nicking are signs of many systemic diseases. In this paper, an automatic method for AV-nicking detection is proposed. The proposed method includes crossover point detection and AV-nicking identification. Vessel segmentation, vessel thinning, and feature point recognition are performed to detect crossover point. A method of vessel...
An improved image fusion method is proposed in this paper. Firstly, the source image was decomposed into the low-pass and directional band-pass coefficients by nonsubsampled contourlet transform (NSCT) for multi-sensor image fusion of the same scene. The low-pass part uses the fusion method of improved the energy contrast, it fully takes into account the energy contrast of coefficient as well as the...
In this paper, we focus on the problem of image retrieval in trademark database and concentrate on the method for efficient trademark image retrieval based on new shape feature without complicated image segmentation. The proposed trademark image retrieval scheme comprises two stages: first, edge detection based on wavelet transform is performed on the trademark image, second, novel wavelet -based...
In this paper, based on the mixed Gaussian modeling and segmentation of moving objects and shadow, we propose an adaptive threshold shadow detection method based on image block statistics. The experiments of the video sequences with the different light and environmental conditions show that the method can remove the shadow of the moving target very well, and it also can choose the threshold adaptively.
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