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In the digital watermarking technology based on wavelet transforms, it is of practical significance to improve the robustness of the JND (just noticeable difference) model and to control the probability of false alarm when extracting the watermarks from the watermarking systems. In the paper, a new watermark embedding algorithm has been studied and several experiments have been done as follows: a...
Based on the theory of multiwavelet analysis and fractal dimensions, a novel adaptive image interpolation algorithm is proposed. By one level multiwavelet decomposition, the image is transformed into four low frequency bands and twelve high frequency bands. Using the fractal dimensions of high frequency bands, every band of two level multiwavelet transform for high-resolution image is obtained adaptively...
With the growing number of digital multimedia libraries, the need to efficiently index multimedia information is increasing, detecting and extracting the text information from images plays an important part in images indexing based on content. In the paper, a new text extraction algorithm under background image based on two-dimensional wavelet transforms is proposed. For the algorithm, firstly the...
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