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State of the art video compression techniques use the motion model to approximate geometric boundaries of moving objects where motion discontinuities occur. Motion hints based inter- frame prediction paradigm moves away from this redundant approach and employs an innovative framework consisting of motion hint fields that are continuous and invertible, at least, over their respective domains. However,...
Fisheye cameras have become extremely popular in applications where the goal is to capture large fields of view with only one camera. However, the wide-angle fisheye imagery has special characteristics that may not be very well suited for modern video codecs that employ block-based translational motion model. This model fails to describe complex deformable motion which is often present in fisheye...
Segment-based temporal prediction combined with higher-order motion models have been studied as an alternative to conventional block-based translational inter prediction. One example of such studies is known as motion hints, where an affine motion model has been used. In this paper, we explore the applicability of motion hints with an elastic motion model in generating reference frames for conventionally...
Traditional video coding standards employ block-based translational motion modelwhere all the pixels inside the current block are assigned a single motion vector. Thisuniformity of motion within a block assumption does not hold if the block containsa motion discontinuity. To improve the coding gain, modern video codecs partitionblocks around object boundaries into smaller square or rectangular sub-blocks...
Traditional video coding uses the motion model to approximate geometric boundaries of moving objects where motion discontinuities occur. Motion hints based inter-frame prediction paradigm moves away from this redundant approach and employs an innovative framework consisting of motion hint fields that are continuous and invertible, at least, over their respective domains. However, estimation of motion...
Recent advances in motion modelling have largely focused on careful partitioning of motion blocks in the vicinity of object boundaries. The need for such fine partitioning can be avoided by using motion hints which provide a global description of motion over specific domains. Experimental results show that, with a hybrid setting, more than 50% of the motion discontinuity macroblocks are coded using...
Experimental results and the latest standards have proved video coding systems with the ability to adapt the size and shape of the motion estimation area to the objects in the scene can outperform the traditional block-based video coding systems. In this paper, a segmentation-based coding strategy that employs bi-directional motion hints for interframe prediction is proposed. The appealing thing about...
Experimental results and the latest standards have proved that segmentation based video coding systems can outperform the traditional block-based video coding systems. However, this approach requires the simultaneous estimation of both the shape and motion of moving objects in a video scene. In most of the cases neither the shape nor the motion are known initially. Another critical aspect of this...
We introduce a method for denoising a digital image corrupted with additive noise. A dyadic Gabor filter bank is used to obtain localized frequency information. It decomposes the noisy image into Gabor coefficients of different scales and orientations. Denoising is performed in the transform domain by thresholding the Gabor coefficients with phase preserving threshold and non-phase preserving threshold...
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