Inter frame

About: Inter frame is a research topic. Over the lifetime, 4154 publications have been published within this topic receiving 63549 citations.

Spatio-Temporal Iterative Source–Channel Decoding Aided Video Transmission

Abstract: Low-complexity uncompressed video transmission meets the requirements of home networking and quality/delay-sensitive medical applications. Hence, it has attracted research attention in recent years. The redundancy inherent in the uncompressed video signals may be exploited by joint source–channel decoding to improve the attainable error resilience. Hence, in this treatise, we study the application of iterative joint source–channel decoding aided uncompressed video transmission, where correlation inherent in the video signals is modeled by a first-order Markov process. First, we propose a spatiotemporal joint source–channel decoding system using a recursive systematic convolutional codec, where both the horizontal and vertical intraframe correlations, as well as the interframe correlations, are exploited by the receiver, hence relying on 3-D information exchange. This scheme may be combined with arbitrary channel codecs. Then, we analyze the three-stage decoder's convergence behavior using 3-D extrinsic information transfer (EXIT) charts. Finally, we benchmark the attainable system performance against a couple of video communication systems, including our previously proposed 2-D scheme, where only intraframe correlations were exploited without invoking a channel codec. Our simulation results show that substantial $E_{b}/N_{0}$ improvements are attainable by the proposed technique.

A Conditional Replenishment Hadamard Video Compressor

Abstract: Most interframe video compression using transforms uses three-dimensional transforms or differential pulse code modulation (DPCM) between successive frames of two-dimensionally transformed video. Conditional replenishment work is nearly all based on DPCM of individual picture elements, although conditional replenishment of transform subpictures can take advantage of the predefined subpictures for addressing and can use the most significant transform vectors for change detection without decoding the compressed image. A conditional replenishment transform video compressor has been simulated in preparation for hardware design. The system operates at a fixed rate and uses compressed frame memories at the transmitter and receiver. Performance is a function of transmission rate and memory capacity and is dependent on the motion content of the compressed scene.© (1977) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A replenishment technique for low bit-rate video compression based on wavelets and vector quantization

Abstract: This paper presents a variable bit-rate encoding scheme developed for digital video compression based on spatiotemporal decomposition and vector quantization. This encoding scheme exploits the interframe redundancy present in image sequences by employing replenishment of code-vector labels. The experiments indicated that code-vector label replenishment results in a significant reduction of the number of bits required for encoding the frames of image sequences. The proposed video-compression system outperformed the H.261 video-compression standard at high compression ratios, and produced reconstructed video of comparable visual quality at medium and low compression ratios.

A Predictive Block-Size Mode Selection for Inter Frame in H.264

Abstract: One of the new features adopted in the latest H.264/AVC video coding standard is the mode decision (MD), which greatly improves the rate-distortion performance but it also takes up a significant encoding time to determine the best mode. This paper presents a predictive block-size selection algorithm to extraordinarily improve the encoding efficiency in H.264. The proposed algorithm mainly takes advantage of two efficient predictive methods: one is predictive skipping checking the sub-macroblock-level modes according to the sum of absolute difference (SAD) of each macroblock and the other is filtering some sub-macroblock-level modes with an adaptive threshold obtained from the mode information in the previous determined macroblock. Experimental results and comparative analysis are given to verify that our proposed algorithm can achieve a speed-up factor with 30% compared with the current fast full search algorithm, with negligible average PSNR loss of 0.071 dB and bit rate increase of 2.78%

Method for reducing noise in digital video information

Abstract: A method for reducing noise in digital video information is provided which includes the use of key frames, whereby pixel values for a key frame replace the corresponding pixel values for corresponding pixels of all subsequent frames prior to another key frame, as long as the pixel values being replaced do not differ from the key frame values by more than a predetermined threshold. A key frame, once established, is compared to a next frame to determine whether the next frame should be designated another key frame. The next frame should be designated another key frame when more than a predetermined portion of the pixels of the next frame differ from corresponding pixels of the original key frame by more than a predetermined threshold. The method proceeds recursively until all pixels of all frames are resolved by having their values replaced by key frame values. The method may include data compression as an integral part thereof.