Chowdary Adsumilli

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A robust error concealment scheme using data hiding which aims at achieving high perceptual quality of images and video at the end-user despite channel losses is proposed. The scheme involves embedding a low-resolution version of each image or video frame into itself using spread-spectrum watermarking, extracting the embedded watermark from the received(More)
In this paper, a novel hybrid scheme with constrained Unequal Error Protection (UEP) and data hiding is proposed which maximizes the perceptual quality of the video at the end user to compensate for the effects of channel losses. The technique involves (1) implementing a forcing function which weighs the objective perceptual quality of the video frame based(More)
AbsmcIIn this paper, B now1 adaptive Unequal Error Pmteclion (WP) scheme is proposed which dynamically madies the UEP level in B packet based on constraints imposed by variations in wireless channel mnditions. The technique involves (1) implementing B foreirigfuncrion which weighs the objective perceptual quality of the image to give the optimum protection(More)
In this work, the detector performance of a watermark-based error concealment (WEC) system proposed in C.B. Adsumilli is mathematically analyzed. The spread spectrum based WEC algorithm embeds a low resolution version of an image in itself during encoding. At the receiver, this embedded watermark is extracted and used as a reference to conceal the(More)
 An error concealment using data hiding (ECDH) techniques is proposed to improve the end user perceptual quality of videos that are affected by transmission defects. It is implemented using a 2 x 2 set of coefficients from each block of block-based 2D DCT of the video frame, encoded using DPCM and is embedded in the frame itself, by a low gain spread(More)
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