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This paper presents a proposal for transmitting and recovering images using Multiple Description Coding (MDC) techniques over unreliable multiple links in a mesh network, while using network coding technique to add a protection path. In pure MDC, the loss of one description degrades the received image quality. In the proposed technique, the protection path ensures that all the descriptions are received...
Abstract--This article is based on H.264/AVC video coding standard, including analysis of the current UMHexagonS algorithm processes and problems, Optimization of the entire pixel search algorithm UMHexagonS and an improved sub-pixel search algorithm, and gives the improved UMHexagonS algorithm process ,describes its advantages. Experimental results show the improved efficiency of the algorithm, practical...
The redundancy of the video image in time is mainly eliminated by inter-frame prediction encoding. We established the all-zero block threshold model in different cost functions and quantization parameters by the use of a combination of mathematical and statistical methods. So, we can judge Pesky mode before the motion estimation, and we proposed the inter-frame coding algorithm optimization program...
The relevance of the spatial domain is mainly eliminated by intra-prediction encoding. First, the traditional intra-prediction algorithms are introduced. And then, according to the correlation between the most likely mode and the best mode, a mode matrix is arrived at, the use of this mode matrix for early termination. The experimental results show that when we use this matrix in the proposed algorithm,...
In this tutorial paper, we will outline a solution for prototyping, programming and implementing Application Specific Instruction-set Processors (ASIPs). A general introduction into this class of processor architectures and their characteristics is provided. The Synopsys Processor Designer tool suite and the LISA language for ASIP design are jointly introduced in the context of a H.264 design example...
Spike based imagers commonly use either time-to-first spike (TTFS) or spike rate encoding exclusively. In this paper we discuss the benefits of using a mixed-mode encoding scheme backed by theoretical analysis and SPICE simulations. The mixed-mode readout uses both TTFS and spike rate information to estimate the illumination for each pixel, which lessens the maximum spike rate and timing clock speeds...
An image compressing technique for High Dynamic Range (HDR) image sensors is introduced. Compression is performed in two steps: Pixel value coding optimization followed by DCT-based (Discrete Cosine Transform) compression. A floating point coding technique is first used with a common exponent shared between pixels of the same block, and then a DCT is applied to each group of pixels. This new concept,...
Recently, Distributed Video Coding (DVC) has been actively studied as a solution to the growing demands on light video encoder. However, DVC shifts the complexity from the encoder to the decoder side, and in some applications it needs unacceptably long decoding time and/or big computing power. In this paper, we propose a Wyner-Ziv (WZ) video coding which extracts fast moving regions called Region-Of-Interest...
Distributed video coding (DVC) is an interesting research topic for emerging application scenarios requiring low complexity video encoding. The central Slepian-Wolf (SW) coding, in a DVC system, exploits the cross correlation between the side information and the original frame. But, it does not exploit the source entropy of the input symbols, which is exploited by entropy coding in conventional video...
Super-resolution is very important in recognizing suspects face in video surveillance system. In this paper, we present an improvement of image super-resolution based on sparse signal representation. The issue of how to deal efficiently with sparse feature has great significance on the quality improvement of generated high resolution image. We propose to use Elastic net to solve sparse representation...
Embedded Image Coding provides a gradual improvement in the reconstruction of image as transmission proceeds. Designing of a successful embedded image compression algorithm involves the method of modeling and ordering in wavelet domain. A new embedded image compression algorithm Pixel Classification and Sorting (PCAS) is employed because of its effective and excellent compression performance. Watermarking...
In this paper, a multiband loss less compression system exploiting inter-band data correlation is presented. We develop an adaptive prediction scheme that can dynamically switch among smooth, intra and intra-band prediction modes subject to the data correlation. Specifically, we use context information to determine the inter-band correlation between neighboring bands, and then borrow the wisdom of...
H.264 adopts variable length coding and interprediction techniques, so compressed image is very sensitive to channel error. Meanwhile errors will influence subsequent frames, easily leading to the distortion of rebuilding images. To enhance the quality of reconstructed images, this text proposes a weighted outer boundary matching algorithms based on multiple reference frames, which exploits the characteristic...
In order to transmit live video or video streaming at low bit-rates, the encoder usually needs to reduce the frame rate to cope with the available bandwidth. In this paper, a new dynamic frame-skipping scheme for live video encoding based on motion detection in the adaptive length sliding window is proposed. The length of a sliding window can be adjusted according to bandwidth variation in order to...
For image and video compression standards, one image is divided into a serial of non-overlapped blocks. Detecting edge existence and analyzing the edge direction in a block level is useful in the applications, such as perceptually improved coding, MB encoding mode decision, blocking artifacts reduction, content-based retrieval, senses changing detection, etc. This paper proposes a novel Fast Block...
Developed a image enhancement technology, Control the brightness of each image grid by image processing grid, And adjust the error diffusion algorithm expansion factor, Selection sub-field arrangement that can produce a stable discharge to display for a given sub-field coding in order to ensure the stability of discharge, Taking into account the image brightness distribution characteristics, Use multiple...
This paper presents a parallel and scalable solution for adaptive deblocking filtering in H.264/AVC. While traditionally in deblocking filtering, the edges in a macroblock are processed in a sequential order, this paper demonstrates how algorithm modifications can be used to enable processing multiple consecutive edges at the same time. The proposed method increases the throughput in proportion to...
A scheme of information hiding for H.264 based on the prediction difference of intra_4 × 4 is proposed in this paper. According to this difference, the proposed algorithm first divided the intra_4 × 4 prediction modes (I4-modes) into two groups to form the rule of mapping between these modes and the bits to be hidden, and then modified the I4-modes by the rule of mapping to implement the hiding of...
To significantly reduce the number of block-matching (BM) processes in motion vector estimation for HDTV, we have developed an extremely fast block matching (BM) algorithm that we call a "Stick-Shaped Window Search (SSWS)" BM algorithm for H.264/AVC. The algorithm consists of three steps: (1) sub-sampling BM in a reduced number of stick-shaped windows, (2) filternate eight-direction sub-sampling...
Human visual system function is non-uniform to visual perception. Normally, people tend to focus on one or more specific moving objects while watching video. In addition, video transmission is flawed due to heterogeneous networks and limited bandwidth. Therefore, how to transmit the content of interests more efficiently becomes a growing concerning topic. This paper proposes a method of multi-region...
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