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In this paper, a new image compression algorithm based on decreasing bits coding, a conception of compression cell, and compression operator about a number of consecutive Z are put forward. The basic idea is as follows. First, wavelet coefficients, with adaptive threshold to determine the relationship are divided into three situations. They are positive P greater than or equal to the threshold, a...
In this paper, a wavelet-based digital image watermarking algorithm is putforward, advantage of the zero-watermark. In proposed algorithm, the key is generated by XOR operation.This algorithm has very srong robustness, because of the pixel point are hardly changed. At the same time it has very strong invisibility because it dose not modify the data of the original image. Experiments show that a better...
In order to improve the invisibility and the robustness of semi-fragile watermarking, the paper first brings up the idea which embedding watermark based on the attackspsila characteristic, brings forward the region segmentation operator and the double-step embedding method. The paper puts forward the characteristic and its representation in DWT transform domain based on visual features model, and...
An image classification method based on wavelet transform was brought up, and it adopted the human visual features model and analyzed the image parameter characteristics in smooth and texture regions. It put up optimum carrier image selecting method of original image to be hidden while analyzing the differences between the carrier and being hidden image. On the premise of setting a threshold, it made...
Image unchangeable coefficient rule in discrete cosine and wavelet transformation was proved when it was scrambled in spatial domain. Based on the constructed composite chaotic iterative dynamic system, whose invariant distribution density was one, and in order to initialize for composite chaotic iterative dynamic system, it put forward two construced functions using image scramble constant as input...
A new self-embedding and fragile watermarking technique which was used for image integrity authentication was brought up. The assured function of the composite chaotic iterative dynamic system and its initial parameter was put forward. The method using the single pixel value for self-authentication that authenticating bit embedded in the lowest significant bit of the pixel value was brought up. It...
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