Topic
Inter frame
About: Inter frame is a research topic. Over the lifetime, 4154 publications have been published within this topic receiving 63549 citations.
Papers published on a yearly basis
Papers
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TL;DR: It is shown that while both Twin-H.261 and Inter-Enhance codecs generate bit rates close to the one-layer coder, their resilience to cell loss closely follows the normal two- Layer H.261 coder.
Abstract: Two methods for bit-rate reduction of two-layer video codecs, without impairing their robustness to cell loss are introduced. Both methods employ an H.261 compatible coder at the base layer and an interframe coder at the second layer. In the first method a second H.261 is used to code the residual errors of input pixels. Parameters of this Twin-H.261 codec in terms of effect of motion estimation, resilience to cell loss and forced updating are investigated. The second method employs an interframe coder among the enhancement DCT coefficients (Inter-Enhance) of successive frames of similar frequencies. Introduction of a leaky prediction in the interframe loop preserves the coder resilience to cell loss. Optimum value of the leak factor is found to be in the range of 0.85-0.95. It is shown that while both Twin-H.261 and Inter-Enhance codecs generate bit rates close to the one-layer coder, their resilience to cell loss closely follows the normal two-layer coder. >
40 citations
01 Jan 1988
TL;DR: When SIVP is combined with scalar quantization, it is found that the LPC parameter bit-rate required to achieve high-quality synthetic speech is only 1300 bits per second.
Abstract: LPC spectral parameter encoding is often a challenging task in the development of low bit-rate speech coding systems. An efficient, low complexity method called Switched-Adaptive Interframe Vector Prediction (SIVP) has been developed for this purpose. SIVP utilizes vector linear prediction to exploit the high frame-to-frame redundancy present in successive frames of LPC parameters. When SIVP is combined with scalar quantization, we have found that the LPC parameter bit-rate required to achieve high-quality synthetic speech is only 1300 bits per second. With vector quantization, the bit-rate can be reduced even further (to 1000 hits per second) without introducing any perceivable quantization noise in the reconstructed
40 citations
28 Dec 2009
TL;DR: Simulation results show that the proposed algorithm has better rate-distortion performance, especially for image sequences with middle-motion complexity or low encoding bit-rate as comparing with H.264/AVC using conventional RDO.
Abstract: Rate-distortion optimization (RDO), in which distortion metric plays a vital role, has been proved to be an effective way in hybrid video coding. This paper proposes an improved rate-distortion optimization method based on SSIM (IRDO-SSIM) in RDO mode selection process. And the derivation of the proper multiplier to fit for the IRDO-SSIM is mainly described in this paper. Simulation results show that the proposed algorithm has better rate-distortion performance, especially for image sequences with middle-motion complexity or low encoding bit-rate as comparing with H.264/AVC using conventional RDO.
40 citations
Patent•
27 Apr 2001
TL;DR: In this paper, the encoding bit rate at which an encoder encodes selected video frames of a sequence of video frames at a video sending device is selected to provide a constant consistency quality level and constant frame rate of display of the video frames in a video receiving device.
Abstract: Apparatus, and an associated method, for selecting the encoding bit rate at which an encoder encodes selected video frames of a sequence of video frames at a video sending device. Selection is made to provide a constant-consistency quality level and constant frame rate of display of the video frames at a video receiving device. Selection of the encoding bit rate is made responsive to a targeted frame rate and allowable communication rates upon a communication channel upon which encoded representations of the video frames are to be communicated.
40 citations
TL;DR: The proposed framework enables the adaptation of the coding process to the video content, network and end-device characteristics, allows for enhanced scalability, content-adaptivity and reduced delay, while improving the coding efficiency as compared to state-of-the-art motion-compensated wavelet video coders.
Abstract: We introduce an efficient and flexible framework for temporal filtering in wavelet-based scalable video codecs called unconstrained motion compensated temporal filtering (UMCTF). UMCTF allows for the use of different filters and temporal decomposition structures through a set of controlling parameters that may be easily modified during the coding process, at different granularities and levels. The proposed framework enables the adaptation of the coding process to the video content, network and end-device characteristics, allows for enhanced scalability, content-adaptivity and reduced delay, while improving the coding efficiency as compared to state-of-the-art motion-compensated wavelet video coders. Additionally, a mechanism for the control of the distortion variation in video coding based on UMCTF employing only the predict step is proposed. The control mechanism is formulated by expressing the distortion in an arbitrary decoded frame, at any temporal level in the pyramid, as a function of the distortions in the reference frames at the same temporal level. All the different scenarios proposed in the paper are experimentally validated through a coding scheme that incorporates advanced features (such as rate-distortion optimized variable block-size multihypothesis prediction and overlapped block motion compensation). Experiments are carried out to determine the relative efficiency of different UMCTF instantiations, as well as to compare against the current state-of-the-art in video coding.
40 citations