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H.264/AVC employs intra prediction to reduce spatial redundancy between neighboring blocks. Different directional prediction modes are used to cater diversified video content. Although it achieves quite high coding efficiency, it is desirable to analyze its drawbacks in the existing video coding standard, since it allows us to design better ones. Basically, even after intra prediction, the residue...
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...
This work proposes a new intra prediction coding scheme for depth map images used in view interpolation. The main goal is to design a prediction scheme which can reduce the prediction error energy in blocks with arbitrary edge shapes. This will reduce the rate needed to encode such blocks while also eliminating some of the annoying artifacts caused by quantization. Since depth maps typically consist...
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...
Comparing with Simulated Annealing (SA) that is often used in the image segmentations based on Markov Random Field (MRF) models, Genetic Algorithm (GA) has been applied into reducing the computation complexity of optimization. However many scholars used GA as an optimal tool that based on the gray-scale values of pixels as individuals and limited the mutations and crossovers with the gray-level coding,...
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...
Coded structured light is an effective technique to acquiring shape in stereovision. Coding strategy is one of the core techniques because it effects the measure precision and efficiency directly. There are two major group of techniques in color structured light encoding. One is to define coloured multi-slit, which is suitable for locating intensity peaks in the image. The other is to define coloured...
In H.264/AVC intra frame coding, the rate-distortion optimization (RDO) is employed to select the optimal coding mode to achieve the minimum rate-distortion cost. Due to a large number of combinations of coding modes, the computational burden of Rate distortion optimization (RDO) becomes extremely high in intra prediction. In this paper, we proposed an efficient intra block size decision that selects...
H.264, MPEG-4 Part 10, is the latest digital video coding standard that achieves very high data compression by using several new coding features. One of the key features is the intra prediction based on the rate distortion optimization (RDO) procedure, which requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction with the RDO procedure...
This paper presents a color structured light technique for recovering object shape from images. Coding strategy is one of the most important techniques because it effects the measure precision and efficiency directly. Unlike traditional encoding methods, we design new coloured stripe patterns in order to locate both intensity peaks and edges. Then edge detection method with sub-pixel accuracy is performed...
We present a novel multi-view depth map enhancement method deployed as a post-processing of initially estimated depth maps, which are incoherent in the temporal and inter-view dimensions. The proposed method is based on edge and motion-adaptive median filtering and allows for an improved quality of virtual view synthesis. To enforce the spatial, temporal and inter-view coherence in the multiview depth...
In this work, we have designed an efficient arithmetic coder for the non-linear bi-level image coder based on reversible cellular automata transform reported in the work of Cruz-Reyes and Kari (2008). The proposed approach relies on non-linear transform operations based on RmbCA, decomposing the image into four subimages (named LL, LH, HL, HH in lexicographic order) in such a way that the LL subimage...
This paper proposes an advanced lossless image and video compression method which applies adaptive plane split according to the features of various types of input data. The results demonstrate that the method improves the compression ratio, particularly for video sequences having a large amount of texture and many edge components. It also maintains low complexity as compared to the existing method.
H.264, MPEG-4 Part 10, is the latest digital video coding standard that is noted for achieving very high data compression by using several new coding features. One of the key features is the intra prediction based on the rate distortion optimization (RDO) procedure, which requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction...
A method of extracting the target image edge combined with digital image recognition technology is discussed. The Prewitt algorithm is employed to detect the edge boundary of the given color image and the quadtree segmentation technique is employed to cut down the storage cost of identification codes. The edge information of color images is exploited to design the Identification codes. This method...
In this paper, we present a novel adaptive GOP structure(AGS) for H.264/SVC. Proposed method adaptively defines the GOP structure by analyzing the input sequence characters. The accumulated difference of luminance pixel components is utilized to set a threshold for adaptive GOP size definition. Another scene change detection method is also proposed to reorganize the GOP structure. Different from previous...
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