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Synthetic aperture radar (SAR) systems are mounted on airplanes and satellites, which have limited downlink and storage capacity, yet SAR image sequences may be produced at rates of several Gbps. Compression is di cult because SAR images contain signi cant highfrequency information, such as terrain boundaries and terrain texture. In assessing the quality of compressed images, peak signal-to-noi...

In wavelet-based image coding, a variety of masking properties have been exploited that result in spatially-adaptive quantization schemes. It has been shown that carefully selecting uniform quantization step-sizes across entire wavelet subbands or subband codeblocks results in considerable gains in efficiency with respect to visual quality. These gains have been achieved through analysis of wav...

Radial lens distortion is the displacement of image points along a radial axis from a single point on the image plane. This point is known as the principal point, and does not always necessarily align with the image sensor center. Therefore, in order to be able to fully model and correct radial lens distortion, it is necessary to accurately determine the principal point. Physically, the princip...

This paper by considering objective distortion measure into a data hiding method makes a little improvement to it. The distortion measure considers not only how many pixels are changed but also where the pixels are changed and how the flipping affects the overall shape formed by the edge line. The data hiding method uses a secret key and a weight matrix to protect the hidden data and ensures th...