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This paper proposes an algorithm to perform robust digital watermarking through image scrambling and singular value decomposition (SVD). Both the watermark and the carrier are images, and the proposed algorithm aim to ensure the robustness and perceptual invisibility of the embedded watermark. The proposed algorithm first performs a scrambling encryption on the watermark and carrier images. The scrambled...
Multi-focus image fusion is to extract the focused regions from the multiple images of the same scene and combine them together to produce one fully focused image. The key is to find the focused regions from the source images. In this paper, we transform the problem of finding the focused regions to find the boundaries between the focused and defocused regions in the source images, and propose a novel...
A technique of completely non-contact laser ultrasonic imaging was proposed to detect austenitic stainless steel with an artificial defect. Austenitic stainless steel was scanned by using the pulse of Nd:YAG laser, and the ultrasonic wave was received by the interferometer. The ultrasonic vibrations image at different locations away from the damages was analyzed in detail, and then taking discrete...
Recently, security of cognitive radio (CR) is becoming a severe issue. There is one kind of threat, which we call greedy spectrum occupancy threat (GSOT) in this paper, has long been ignored in previous work. In GSOT, a secondary user may selfishly occupy the spectrum for a long time, which makes other users suffer additional waiting time in queue to access the spectrum and leads to congestion or...
Region duplication is a simple and effective operation to create digital image forgeries, where a part of the image is copied and pasted on another part of the same image. Most existing region duplication detection methods are based on directly matching blocks of image pixels or transform coefficients, and are not effective when duplicated regions have affined transforms or blur degradations. In this...
This paper discusses the soccer robot orientation method which is based on sight, and locates soccer robot by using method based on color shape as well as establishes threshold segmentation, edge detection and the model of Hough transform for circle detection with an emphasis in threshold segmentation and Hough transform. Several methods are used for threshold segmentation, evident difference of images...
The complex nature of road images and weak signal make the detection of pavement cracks particularly difficult. An algorithm for pavement cracks detection based on Beamlet Transform is proposed. Beamlet transform is a new tool for high dimensional singularity analysis. First, the pavement surface image was segmented into unit image and transformed to binary image. Then beamlet transform was performed...
A new poles extraction technique is presented based on modified damping least squares algorithm combined with matrix pencil method. Initial values of poles are obtained using matrix pencil method to overcome local convergence of nonlinear least squares. Stability of iterative algorithm is improved utilizing modified damping least squares algorithm instead of other methods. Perfect simulation results...
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