<p>Integrated healthcare systems require the transmission of medical images between medical centres. The presence of watermarks in such images has become important for patient privacy protection. However, some important issues should be considered while watermarking an image. Among these issues, the watermark should be robust against attacks and does not affect the quality of the image. In this paper, a watermarking approach employing a robust dynamic secret code is proposed. This approach is to process every pixel of the digital image and not only the pixels of the regions of non-interest at the same time it preserves the image details. The performance of the proposed approach is evaluated using several performance measures such as the Mean Square Error (MSE), the Mean Absolute Error (MAE), the Peak Signal to Noise Ratio (PSNR), the Universal Image Quality Index (UIQI) and the Structural Similarity Index (SSIM). The proposed approach has been tested and shown robustness in detecting the intentional attacks that change image, specifically the most important diagnostic information.</p>
The target of high resolution digital terrain elevation sequence is to obtain 3-D representation of a terrain's surface. In this work we used interferometric technique which is based on the analysis of the phase difference between the signals received at two antenna position. Under suitable conditions, the resulting DEM of this method is locally the most precise one. This work is concerned with the exploitation of radar SLC images of the Las Vega area acquired on 24 May and 25 May 1994, the first is taken as the master image and the other as slave. We have developed an interferometric process beginning with the implementation of a co-registration algorithm for the images. Then we developed the flatearth phase elimination from the interferogram. We also developed a filter in order to minimiz the existing noise. At the end remove the effect of under sampling to get a good result in the final step of the process which is the unwrapping step.
Infrared radiation bolometer which is made of thin film of a aSi:H is thermally modeled using 3-d finite element analysis method (FEA) .This bolometer is realized in a multilevel electro thermal structure having high fill factor. Using the multilevel structure, thermal isolation can be indepentely optimized without sacrificing IR absorption area. The design show that thermal time constant of 12.95 ms, responsivity of 4.65X10 3 V/W,and detcetivity of 7.97X10 8 cm Hz 1/2 w-1 can be achieved in 50µmx50µm michromachined structure.
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