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With the deployment of the fourth generation communication networks, mobile video broadcast services are becoming one of the essential parts of users' daily lives. As an efficient way for mobile video transmission, digital broadcast scheme is faced with the challenge of cliff effect. A novel real-value scheme called SoftCast can eliminate the cliff effect, but not efficient in removing inter- frame...
In this paper, we propose a new framework for compressive video sensing (CVS) that exploits the inherent spatial and temporal redundancies of a video sequence, effectively. The proposed method splits the video sequence into the key and non-key frames followed by dividing each frame into the small non-overlapping blocks of equal sizes. At the decoder side, the key frames are reconstructed using adaptively...
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,...
We jointly design the reconfigurable ring convolutional encoders and reconfigurable convolutional interleavers for the MPEG-4 medical image transmission system. Our objective is to maintain our desirable system performance due to the variation of channels with the lowest system complexity. In order to gain the performance in burst noise environment, we usually apply an interleaver by trading off with...
With the rapid development of the Internet, the transmission of information between people has become simple and convenient. In the public Internet, the confidentiality of information is an important issue. This problem can be solved easily by using steganography, which also is referred to as 'data hiding.' In 2006, Zhang and Wang proposed an 'exploiting modification direction' (EMD) scheme in which...
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...
Distributed video coding (DVC) is a potential solution for distributed video sensors in wireless visual sensor and machine-to-machine (M2M) networks. However, the error resilience schemes have not been fully investigated in literatures. In this paper, we propose several error resilience schemes for key frame transmission of DVC, including resending, refining, and hybrid modes. The resending mode asks...
Most recently, the low density parity check codes are chosen as the channel encoding method to encode the Wyner-Ziv frames in distributed video coding. These codes involve much complicated encoding and decoding algorithms, and might increase the processing time of the system. In this paper, we use the codes with simpler encoding and decoding algorithms, the Reed Solomon codes, and compare the performance...
Wireless video transmission is one of the main applications of wireless local area networks. And high-speed video transmission can be achieved with the application of MIMO-OFDM technologies. But the conventional digital video transmission in MIMO has to degrade performances of all the antennas to be the same as the antenna with the worst channel gain. Based on H.264/AVC and ParCast, a hybrid digital-analog...
Due to the difficulties on approximating the human perception with algorithms, increasing the users Quality of Experience (QoE) in modern video services is a challenging task. But more than that, prior to estimating QoE, it is important to know how different types of network impairments actually affect the video quality. This paper takes a closer look at the relation between the network quality of...
In this paper, we present a robust image watermarking approach to hide DNA sequence data into fingerprint templates for copyright protection based on the discrete wavelet transform. A multi-bit watermark, based on DNA data, is embedded into the low frequency sub-band of the fingerprint image. During the inverse process, we employ DNA decoding to extract the image signature from the watermarked image...
In this paper, an analysis of the elapsed time and PSNR for encoding and decoding the videos in different sampling formats of YCBCR i.e. 4:4:4, 4:2:2 and 4:2:0 is proposed. The main algorithm of codec's is Motion-JPEG. The experimental result of comparison shows that the 4:2:0 format take less time for encoding as well as decoding and has comparable signal to noise ratio with that of 4:2:2 and 4:4:4...
In this paper, the performance in terms of compression rates of fractal image compression using Fast Context Independent HV partitioning (FCI-HV) scheme and its variant fractal image compression using Fast Low Context Dependent HV partitioning (FLCD-HV) scheme are improved by applying loss-less data compression techniques on the fractal compressed image. By using loss-less data compression techniques...
In this modern world of Internet and with the development of digital communication and multimedia application, image security has become an important concern in storage and communication. A cryptography technique provides good strength for securing and protecting images essentially in the fields as medical, law enforcement and military. Reversible watermarking provides authentication, in which original...
Lossless data hiding is a newly developed topic in information security researches. With the term of 'lossless', secret information is embedded into original image with methods developed by researchers at the encoder, and marked image is produced. Correspondingly, at the decoder, users are capable of perfectly separating the embedded secret and original image from the marked image, based on the reasonable...
Due to the emergence of mmWave systems that provide multi-Gbps data rate over 60GHz band, uncompressed video transmission has been considered as a commonly used feature for wireless multimedia transmission over the wireless personal area networks (WPANs). However, mmWaves signals usually have higher attenuation than the conventional low-frequency wireless signals, and therefore supporting transmission...
Steganography is the art and science of writing hidden messages in such a way that, apart from the sender and intended recipient, no one suspects the existence of the message, a form of security through the state of being unknown. The main two famous schemes used for image steganography are spatial domain embedding and transform domain embedding. The main aim of DWT is used to transform original image...
Multimedia data security is becoming important with the continuous increase of digital communications on Internet. The encryption algorithms developed to secure text data are not suitable for multimedia application because of the large data size. This paper proposes a novel video fogging hiding algorithm based on fog theory. Firstly, the original video is divided into frame sequences, and every frame...
Experimental results and the latest standards have proved video coding systems with the ability to adapt the size and shape of the motion estimation area to the objects in the scene can outperform the traditional block-based video coding systems. In this paper, a segmentation-based coding strategy that employs bi-directional motion hints for interframe prediction is proposed. The appealing thing about...
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