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The security of digital images attracts much attention recently. For images the transformation can be implemented at two levels, the first one consists of the pixel value permutation and the second one consists of position permutation. In this paper, we propose an encryption scheme for digital images with new pixel position permutation method based on Evolvable Hardware (EHW). In this work, we use...
Edge detection is very important in image process. According the three standards in edge detection: optimal detection result, optimal location and low repeat response, optimal linear filter is deduced. Base on the standards, a simple BMP edge Detection algorithm is proposed, improved algorithm and color scope D algorithm are given. Experiments prove that running speed of algorithms is satisfied and...
The scientific computing manages massive amounts of very large data sets. The development of description of the format, structure and semantic content of data is essential for the automatic manipulation of data. The aim of this paper is to define an XML-based language for describing the structure, semantic and annotation of scientific data. The XML Schema and the Document Type Definitions (DTDs) that...
To reduce the unfavorable influence of phosphene array irregularity on the form of Chinese character pattern so as to improve recognition accuracy in visual prostheses, two correction methods were put forward. One method was to generate phosphene closest to the target point in regular arrays using weighted nearest neighbor search. The other was to generate phosphene whose center located in the region...
It is shown how basic geometric notions can be used to extract an image signature independently of position, orientation and size. Simple primitives as lengths and slopes remain invariant by affine 2D similarity transformations. They can easily be used to define the invariant signature of an image. Contrary to the previous work in this area, images can be directly analyzed. This means that the extraction...
Phase unwrapping is the reconstruction of a function of a grid given its values mod 2??, which is a key problem in all quantitative applications of synthetic aperture radar (SAR) interferometry and other related fields. In this paper, a path following algorithm for phase unwrapping based on priority queue and quantized quality map is proposed and tested. A discrete quality map and a priority queue...
Satellites gather information from different sensors and send it using a temporal connection with very limited bandwidth. The bandwidth demand can be highly reduced if the satellite preprocesses the data and only sends relevant information. FPGAs offer the necessary flexibility and performance to carry out this preprocessing step. We have designed and implemented the well-known PPI algorithm for hyper...
The paper presents a novel and efficient method of regular geometric shape detection from gray scale images. Artificial ant based methods have not been used much in the field of image processing. This paper demonstrates how artificial ants can be used effectively to extract regular geometric shapes from images. We propose here ant regeneration and recombination system (ARRS), an entirely new approach...
The paper proposes two novel and efficient methods of circle detection from gray scale images. As a tool, we have used in one scheme ant colony algorithm. In other scheme, we have used ant regeneration and recombination system (ARRS), an entirely new approach developed by ourselves. In both the schemes presented here, three common steps were followed. Firstly, MATLAB edge detection operator converts...
Recently data embedding over images have drawn tremendous interest, using either lossy or lossless techniques. Although lossy techniques can allow large hiding capacity, host image cannot be recovered with high fidelity. The aim of this work is to increase the embedding capacity while maintaining the visual quality of the stego image. The new technique is named "quasi-lossless" because the...
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