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In view of Chua's circuit's characters and the deficient in DES algorithm, the paper presents a new image encryption scheme based on DES algorithm and chaotic encryption. The chaotic sequence is implemented in the DES algorithm to improve the initial keys and the iterating operations, so that the chaotic encryption is combined with DES algorithm. Theory analysis and simulation results show that the...
This paper suggests a novel MRI image compression scheme, using the discrete wavelet transformation (DWT) and an improved Bayesian restoration approach. The suggested methodology is based on preservation of important second order correlation (ldquotexturalrdquo) features of either DWT coefficients or image pixel intensities. While rival image compression methodologies utilizing the DWT apply it to...
In this paper, we present a novel high capacity reversible image authentication scheme based on digital watermarking. The proposed technique slightly shifts the histogram of the difference image generated from the original cover image, thus modifies pixel values tenderly while obtaining a high embedding capacity. The distortion caused by embedding can be completely removed after the hidden data has...
This paper presents CRICM (Cross point Regions for lossless Image Compression on Multiple bit planes), an algorithm for losslessly encoding and decoding images, especially medical images, by optimizing on the probability of bits on different bit planes of cross points that are neighbor points of grey levels 2". Based on Gray coding, Gray codes of cross points are determined on an adjacent data...
An innovative embedded algorithm based on context model using neighboring coefficients and parent coefficients is proposed, which can implement real-time image processing and can achieve high fidelity. By analyzing the algorithm and implementation, it is found that the wavelet transform and bit-plane prediction have a great perplexity which can not be implemented efficiently. Based on multiple DSP...
This paper presents a stereo image coding method. We first use a new stereo matching method with difference-based adaptive searching windows to get the fine disparity. Then, we encode the disparity instead of one channel of the stereo image while the other channel is encoded normally. The stereo matching employs the continuity of difference of stereo images to compute the size of adaptive searching...
Digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia files in networked environments. In this paper, a block-based adaptive image watermarking scheme using just noticeable difference (JND) is proposed. The proposed scheme is performed in both pixel domain and discrete cosine transform (DCT) domain. It first divides host image into 8 times 8 blocks...
This paper introduces a novel approach of watermarking for copyright protection applications using the singular value decomposition (SVD) in the dual tree complex wavelet transform (DT-CWT) domain. After applying the 2-level DT-CWT to the cover grayscale image, we apply the SVD to each high-pass subband obtained. The singular values in each subband are then modified by the singular values of the DT-CWT-transformed...
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