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Information sharing over the public domain is one of critical challenge. In this paper, a two stage model is discussed to perform adaptive information encoding and dynamic steganography approach. At first level of proposed model, the adaptive encoding approach is dictionary based approach that performs the cyclic shift to encode the textual or image information. At second level of proposed model,...
A new scheme is proposed which uses the features of Discrete Cosine Transform (DCT) for the embedding of the watermark coefficients and uses a pseudo-random sequence for selection of the DCT coefficients to embed the watermark. These coefficients are different in different watermarked images so there is no chance of collusion of the watermarked images to detect the watermark illegally. The scheme...
This paper deals with the most recent video coding standard H.265/HEVC. HEVC introduces new coding tools compared to older standards. Such a change has to influence the encoder complexity and will have influence on the encoding speed. In this paper, we focus on the performance of different implementations of the HEVC. The encoders are compared on the basis of final video quality and encoding speed...
Modification of the quantizer value based on a region's visual importance within a frame is a popular and widely-used procedure in perceptual video coding. The first contribution of this paper is an alternative modification scheme. Second, our previous work, where we use saliency maps in order to guide the macroblock (MB) mode decision during the ratedistortion optimization process, is extended. Modification...
In this paper, a new fast encoding scheme using CU depth information for quality scalable HEVC was proposed. The proposed scheme based on the correlation between the base layer and enhancement layer, as well as the correlation between current frame and reference frame, which obtained by experiment. The main idea of the algorithm is that when each LCU is encoded in enhancement layer, it's corresponding...
High Efficiency Video Coding (HEVC) is the most recent video compression standard that achieves higher encoding efficiency over earlier popular standards like MPEG-2 and H.264/AVC. By adopting a variety of coding efficiency enhancement and parallel processing tools, HEVC is in a position to provide up to 50% more bit-rate reduction over its precursor H.264/AVC. In an HEVC encoder, transforms are applied...
A lossless data-hiding scheme for the H.264/AVC compressed bit-stream is presented in this paper. Traditional data-hiding schemes of compressed videos would incur a great deal of permanent degradation of signal quality distortion in the marked bit-stream. In the paper, the proposed video data-hiding scheme is able to restore exactly the originally encoded video signal at the decoder while extracting...
With the maturity of 4G communication technologies and the popularity of smart devices, services over mobile devices are getting more and more popular, especially the mobile video services. In this paper, we propose a mobile video broadcast framework to provide each user with the most appropriate video quality according to his channel characteristic. To meet the demands of scalability and robustness,...
Data hiding is a well-known technique which embeds the secret data into a digital media. Most of the existing schemes either have the low image quality, or provide the restricted embedding capacity. In this paper, a new data hiding scheme based on turtle shell is proposed to obtain better image quality and higher embedding capacity. In the proposed scheme, a secret digit is embedded into each cover...
A SoC design of H.264 Video Encoding system is implemented based on FPGA in this paper. Intra prediction algorithm and baseline profile is selected, and H.264 encoder algorithm is designed as an IP core and embedded to the SoC through the interconnect interface AMBA AXI bus. The SoC is implemented on Xilinx Zynq-7000 FPGA and each functional module is simulated by Modelsim and tested within the SoC...
Blur is one of the most difficult distortions in camera captured documents. It degrades the visual quality of an image, and makes it difficult to read whether by a human or OCR systems. This paper presents a novel non-blind deblurring method that combines the well known effective techniques of sparse representations and non-local image similarity. The presented problem formulation enables the use...
This paper discusses the comparison between two modulation systems, pulse code modulation and delta modulation. The objective is to identify a suitable modulation for speech coding by comparing delta modulation (DM) with pulse code modulation (PCM). The reconstruction performance of the delta modulation is compared with the pulse code modulation by using MATLAB, SIMULINK and finally implemented DSP...
In emerging 3D video coding, depth has significant importance in view synthesis, scene analysis, and 3D object reconstruction. Depth images can be characterized by sharp edges and smooth large regions. Most of the existing depth coding techniques use intra-coding mode and try to preserve edges explicitly with approximated edge modelling. However, edges can be implicitly preserved as long as the transformation...
Video coding technique with a background frame, extracted from mixture of Gaussian (MoG) based background modeling, provides better rate distortion performance by exploiting coding efficiency in uncovered background areas compared to the latest video coding standard. However, it suffers from high computation time, low coding efficiency for dynamic videos, and prior knowledge requirement of video content...
Due to its high coding efficiency, H.264/AVC is commonly used in cloud gaming. This compression standard is computationally intensive, but its complexity can be controlled using its encoder configuration parameters. Finding the proper encoding configuration is a challenge for a cloud gaming platform with a large number of heterogeneous clients. In this paper, we have determined a subset of most important...
H.264/AVC, the international video coding standard developed by ITU-T VCEG and ISO/IEC MPEG, is known to be more efficient than other standards. Higher compression is provided with the parameter block mode of H.264/AVC, but due to its low compression efficiency, researchers tend to ignore the algorithm's intra-prediction coding capability. This study examined this overlooked aspect to determine its...
Cloud computing offers sufficient computing and storage resources that can be used to provide multimedia services. Migrating the existing multimedia service to cloud brings a new challenging issue, i.e., remote display of video contents. To reduce the bandwidth consumption especially for mobile users, it is desired to encode video before sending to client. Existing encoding methods have unique advantages...
In this paper, we propose a fast intra-prediction mode decision algorithm based on the probability statistics of the best prediction mode and the relevance of the neighboring blocks for high efficiency video coding (HEVC) to reduce its encoding complexity. The intra prediction candidates are reduced before Rate Distortion Optimization (RDO) procedure by two steps of rough mode decision. Sum of Absolute...
In this paper, we propose a content-adaptive pre-processing for downsampling depth map for 3D multiview plus depth video coding. The proposed scheme takes advantage of spatially varying content of depth maps and targets improved encoding performance. The key idea is to divide the video frames into several horizontal and vertical stripes and downsample each of them with an appropriate downsampling...
In this paper, a motion vector inheritance method is proposed in order to reduce motion estimation complexity of the high efficiency video coding (HEVC) encoder. The proposed method refers to the coded-block-flag (CBF) of 2JV × 2JV prediction unit (PU) to see whether or not its sub-partitioned PU can inherit the motion vector of the 2JV × 2JV PU without actual motion estimation. Experimental results...
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