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Up to now, a number of linear discriminant analysis (LDA) methods have been developed. Though all these methods have a goal of maximizing the between-class distance and of minimizing the within-class distance, they are formally different and seem to have different performance. This paper aims at revealing the similarity and difference between different matrix-based LDA methods, which is helpful for...
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...
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