The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the most common form of wavelet video coding, a three-dimensional discrete wavelet transform (DWT) is applied on a group of video frames (GOF). This approach suffers in compression performance because no motion compensation is used. Other approaches to motion compensated wavelet video coding fails to achieve good video quality in packet loss network due to the absence of a resilient transmission...
In this paper, we propose a new video codec which combines a new compressed sensing theory and some critical ideas of traditional video codecs. Samples needed in the new codec are fewer than in traditional codecs, and the number of samples can be changed according to the encoding mode. The encoder works as a projector, which projects a high dimensional signal to a low dimensional domain, while the...
This paper presents an efficient motion estimation algorithm for enhancing the performance of Dirac wavelet based video encoder. The proposed scheme is based on a 3D recursive search algorithm that uses the previously calculated motion vectors from the neighboring blocks to calculate the motion vector for the current block. The computational complexity is reduced drastically with an improvement in...
We propose a multi-objective optimization framework based on genetic algorithms to enhance the performance of a video codec. The framework is designed to jointly minimize the complexity, memory usage in the encoder, bit rate and maximize the quality of the compressed video stream. In particular, the optimization framework is designed to determine the optimum coding parameters for the H.264 AVC video...
After the great success of the predictive video coding approach, which led to a number of largely deployed MPEG and ITU-T standards, the video coding research community has been working on a new video coding paradigm, so-called distributed video coding (DVC), which is based on some information theory results from the 70s: the Slepian-Wolf and the Wyner-Ziv theorems. The first practical solutions have...
In this paper we describe a practical implementation of a distributed video codec deployed on a real visual sensor platform, viz. the MicaZ/Cyclops platform. The codec supports two encoding schemes, one employs Discrete Cosine Transform (DCT) and the other operates on raw pixels. DCT scheme is more costly in terms of computational power consumption, on the other hand it leads to more compression and...
In this paper, we introduce an H.264-based video streaming system based on hybrid platforms. Namely, the encoder and the decoder run on DSP and PC platform respectively whilst IP network acts as the communication channel. Due to the high complexity of H.264, fast coding algorithms are adopted and new approaches proposed during the implementation of the system. In addition, code-level optimization...
In this article we present the results of tests we did on MPEG-2 and H.264 codecs in order to measure their error resilience.The data flow is being tested in its raw unprotected form which simulates reception of DVB-T in very bad conditions or severly damaged media.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.