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This paper presents an efficient forward inter prediction method for video coding, targeting at low delay applications. The method applies the idea of template matching averaging (TMA) to the conventional motion compensated prediction (MCP). TMA forms the final predictor of a target block by averaging multiple numbers of candidates. While one of the candidate is specified by a motion vector, the remaining...
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...
For natural images, there are usually repeating similar contents but hard to be well predicted locally. Prediction using template matching is an effective technology to exploit such a non-local correlation. In this paper, we propose an alternative scheme to further exploit the non-local correlation. In the proposed scheme, template matching is also used to search for probable similar references to...
Because of its robustness, user friendliness, low cost and high accuracy, palmprint recognition has been widely studied in the past ten years. Various feature extraction and matching schemes have been proposed, among which the Gabor phase and orientation codes are very effective and efficient for palmprint representation and matching. Although these methods are adopted in the online palmprint recognition...
Of the digital video compact coding technology, the technology of motion estimation and motion recovery, which is based on the block match, is adopted to eliminate the redundant data between the contiguous frames of the video sequence. In this paper, the minimal average absolute differences match method and the smooth constrained minimal average absolute differences match algorithm are improved, yielding...
In this paper, we propose a hybrid data hiding method to embed three secret bits to four cover pixels. In the proposed method, a Hamming code word consists of three parity check bits whose values are identical to three secret bits and four data bits whose values are derived by performing XOR Function on four cover pixels. In order to keep the Hamming code word satisfying the condition of (7, 4) Hamming...
This paper introduces a block-based motion estimation algorithm based on projection with adaptive window size selection. By using one-dimensional (1-D) projection the original two-dimensional (2-D) block-matching problem is translated to a simpler 1D matching, which eliminates majority of potential pixel participation. In this paper, we propose an efficient fast motion estimation method by using bi-region...
We present a novel approach to address the representation issue and the matching issue in face recognition (verification). Firstly, our approach encodes the micro-structures of the face by a new learning-based encoding method. Unlike many previous manually designed encoding methods (e.g., LBP or SIFT), we use unsupervised learning techniques to learn an encoder from the training examples, which can...
An effective representation of 3D video in future 3D-TV systems consists of monoscopic video (colour component) and associated per-pixel depth information (depth component). As depth component indicates relative distance between objects within the scene and a camera, pixel values change not only when objects move in vertical and horizontal directions but also when they move in a depth direction. Instead...
Computer vision involves image edge detection which is crucial in outline capturing systems for decomposing and describing an object. This paper presents a scalable parallel algorithm skeleton for outline capturing and object recognition based on first order difference chain encoding. UNIX based Intel Xeon 2-Quadra-Core system is used for the implementation of the parallel algorithm. The algorithm...
The Stanford's WZ codec, Berkeley's PRISM and Europe's DISCOVER, are considered to be three early major research groups in the distributed video coding (DVC) with better performance. In this paper, we propose a new architecture of DVC, which does not follow the abovementioned solutions. Basically, we adopt the PBMA (partial boundary matching algorithm) and ZMVR (zero motion vector replacement) at...
Popular Wyner-Ziv (WZ) video coders divide the sequences into intra key frames and WZ frames. In this paper, we propose a new block-based coding system that uses hybrid intra and WZ frames. A part of each block is first intra coded and the other parts are WZ coded, in a number of steps. There is no need for key frames; the key information is controlled at the block level and used for motion estimation...
In order to improve the speed of matching algorithm and simplify the processing of existing sub-block coding matching, a new template matching method combined local gray value encoding matching and phase correlation is proposed. Matching process is divided into rough matching and fine matching. Rough matching divides the image into certain size blocks called R-block, sums the gray value of each R-block...
With large databases of document images available,a method for users to find keywords in documents will be useful. One approach is to perform Optical Character Recognition (OCR) on each document followed by indexing of the resulting text. However, if the quality of the document is poor or time is critical,complete OCR of all images is infeasible. This paper build upon previous works on Word Shape...
To overcome inaccurate boundary matching algorithm bringing on the miss of the best motion vector and resulting in the bad error concealment effect, the paper proposed a novel effective temporal error concealment algorithm. Using effective temporal-spatial correlation of the motion vectors, it will adaptive construct a limited candidate motion vectors set among the motion vectors of neighboring macroblocks...
Decoder-side motion vector derivation (DMVD) using template matching has been shown to improve coding efficiency of H.264/AVC based video coding. Instead of explicitly coding motion vectors into the bitstream, the decoder performs motion estimation in order to derive the motion vector used for motion compensated prediction. In previous works, DMVD was performed using a full template matching search...
A projective rectification-based view interpolation algorithm is developed for multiview video coding and free viewpoint video. It first calculates the fundamental matrix between two views without using any camera parameter. The two views are then resampled to have horizontal and matched epipolar lines. One-dimensional disparity is estimated next, which is used to interpolate the image for an intermediate...
In asymmetric stereoscopic video coding, one view can be coded in a lower resolution of the other. In this scenario, stereoscopic video can be compressed with only moderately increased bandwidth and complexity compared to 2D monoview video coding. The subjective quality degradation of this scenario can be negligible compared to coding two views with original resolution. The low-resolution view can...
One of the latest extensions for H.264 video coding standard is the multiview video coding (MVC), which can achieve excellent coding efficiency by not only inheriting from H.264 video standard but also incorporating new tools for interview prediction on the multi-view video sequences. A new prediction mode, motion skip mode, was considered for interview prediction as part of MVC. Motion skip mode...
Unsupervised detection of pan and zoom in soccer sequences allows automatic classification of shots and match analysis. In this work we propose a pan and zoom (both in and out) detector specifically designed for low resolution soccer sequences. Our implementation is based on the analysis of the distribution of the motion vectors, already available in the encoded sequence, among a specific subset of...
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