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Security issues are important concerns of image hashing. A type of image hashing needs to randomly divide a given image into several parts, usually rectangles. However, the security problem arises due to the rectangular shapes. So, we propose a new method which enhances the randomness by dividing the image into zigzag blocks with random walk. Security analyses are provided, and experiments show our...
Since more and more new findings and principles of intelligence emerge from neuroscience, spiking neural networks become important topics in artificial intelligence domain. However, as high computational complexity of spiking neural networks it is difficult to implement them efficiently using software simulation. In this paper a new hardware implementation method is proposed. In order to implement...
Though LDPC codes have been accepted by DVB-S2, the LDPC encode of DVB-S2 (digital video broadcasting satellite second generation) are difficult to be implemented for their huge code lengths of 16200 bits and 64800 bits). To shorten the codes will lead the problems of girth-4 and lower weight codes. This paper analyzed the possible reasons leading to the problems, and revised the current code construction...
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