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In this paper a robust image watermarking algorithm based on DCT by Arnold transform and spread spectrum is proposed. The watermarking image is scrambled by Arnold transform to enhance its privacy. The specific second high-frequency DCT coefficients of the original image are selected effectively according to Human Visual System (HVS) and characteristic of digital image processing and then encrypted...
In this paper, an improved fuzzy membership function determination is proposed to train the fuzzy support vector machine (FSVM) for classification which the sample set in reality environment is increasing, and it often contains a lot of noise and outliers. In the improved algorithm, the sample points have the different types of memberships in different regions. The dual membership is introduced to...
For the noise, blurry edge, bad contrast of the medical CT image, this article presents a medical CT image enhancing algorithm based on the mixture scope model of wavelet multi-scale transform. It uses wavelet multi-scale analysis to decompose the image signal to different direction sub-image, studies the different direction sub-pictorial information under the corresponding criterion by the different...
This article uses the advanced wavelet theory to perform multi-criteria transformation on the medical CT image wavelet in order to obtain directive components. The improved wavelet threshold value law is combined with the wavelet homomorphism filter corresponding to the obtained directive components to remove noise and enhance image effect, finally resulting in the multi-scale (level) enhanced images...
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