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In this work we deal with video streams over TCP networks and propose an alternative measurement to the widely used and accepted peak signal to noise ratio (PSNR) due to the limitations of this metric in the presence of temporal errors. A test-bed was created to simulate buffer under-run in scalable video streams and the pauses produced as a result of the buffer under-run were inserted into the video...
In this work, we investigate a new objective measurement for assessing the video playback quality for services delivered in networks that use TCP as a transport layer protocol. We define the new metric as pause intensity to characterize the quality of playback in terms of its continuity since, in the case of TCP, data packets are protected from losses but not from delays. Using packet traces generated...
In this paper we investigate the possible benefits of a caching scheme for video encoded using the data partitioning option from the H.264 standard. We propose a method to measure the importance of a partition based on its contribution to the peak signal-to-noise ratio (PSNR) on all affected frames, and we term this measurement as PSNR profit. We calculate the average PSNR profit for each frame and...
There are low bit and high bit hiding algorithms in the spatial domain. The paper proposes a new algorithm. First, divide the cover image into three-pixel blocks. Then, use Arnold transformation to scramble the secret image. Eventually, modify the pixel values to hiding information according to the corresponding mode of size relations and numbers. The experimental results show that the algorithm realizes...
In this paper, a robust H.264/AVC video transmission system over lossy packet network is investigated and implemented. The H.264/AVC standard has defined a new data partition scheme which can be used to perform unequal loss protection (ULP) in video transmission systems. However, few actual implementation and experiments which integrate data partition and loss protection algorithms have been reported...
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