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In high efficiency video coding (HEVC), Lagrangian rate distortion optimization (RDO) technique is used to optimize the rate distortion (RD) performance. However, the corresponding Lagrangian multiplier does not consider the perceptual characteristic of the input video and thus is not effective for perceptual video coding. To address this problem, an efficient perceptual adaptive Lagrangian multiplier...
Although JPEG2000 is powerful for image compression, since it requires a large buffer size, it is not as popular as JPEG. In industry, less buffer size requirement is an important issue in image compression because in many embedded systems and mobile devices, such as cell phones, TV, and digital cameras, the buffer sizes are usually very small. A large buffer size means large space requirement and...
In this paper, we present a secondary transform scheme for inter-layer prediction residue in scalable video coding (SVC). Efficient prediction of the co-located blocks from the base layer (BL) can significantly improve the enhancement layer (EL) coding in SVC, especially when the temporal information from previous EL frames is less correlated than the co-located BL information. Previously, Guo et...
In this paper, we propose a rate distortion optimization based content adaptive transform method for motion compensation residuals. The proposed method utilizes pixel rearrangement to dynamically adjust the transform kernels to adapt to the residual content. Comparing with the traditional adaptive transforms, the highlight of this work is that it obtains the transform kernels from the decoded block,...
The hybrid transform coding scheme that alternates amongst the asymmetric discrete sine transform (ADST) and the discrete cosine transform (DCT) depending on the boundary prediction conditions, is an efficient tool for video and image compression. It optimally exploits the statistical characteristics of prediction residual, thereby achieving significant coding performance gains over the conventional...
In Distributed Video Coding (DVC) the encoder compresses frames at source rates that rely on the statistical dependency involving the Wyner-Ziv (WZ) and side information frames. A significant issue that individuals address in this paper provides the encoder with a mechanism to spot the origin rate to be found in encoding a WZ frame. One possible solution is to check out a feedback approach; the encoder...
Based on new characteristics of H. 264/AVC, video compression coding standard, a robust video watermarking algorithm for H. 264 that combined with the error correction coding technology was put forward in the paper. In order to improve the robustness to the attack, the error correction code was applied first on the watermark information, then the Lagrangian optimization coding control model was introduced...
This paper presents a realization of integer fast lapped biorthogonal transform (FLBT) via applications of discrete cosine transform (DCT) matrices and dyadic-valued factors for lifting coefficient blocks. It is obtained by using the block-lifting factorization as our previous work and easy matrix manipulations. The proposed FLBT has higher coding performance and fewer rounding operations than the...
This paper presents an efficient data gathering framework of network coding (NC) coupled compressed sensing (CS) in wireless sensor networks (WSNs), called network compressed coding (NCC). We employ network coding to adapt to the dynamic nature of WSNs, such as moving obstacles and link failure. Measurements from sensor networks are often correlated because sensors nodes nearby observe the contiguous...
In this paper, we propose a content adaptive transform (CAT) method for video coding. Firstly, CAT obtains the transform kernels in real-time instead of predefined fixed ones, and therefore it is content based transform. Secondly, the transform kernels is obtained by singular value decomposition (SVD) from a typical decoded block without transmitting them to the decoder. Thirdly, the optimality property...
The h.264 standard adopts an effective intra-frame prediction coding algorithm to reduce spatial redundancies and improve the compression ratio, but this high performance was reached by exhaustively trying all available prediction modes and selecting the best one, which becomes the bottleneck of this algorithm. In this paper, we propose a high throughput prediction and mode decision architecture to...
In this paper, a novel partial encryption method for video encoding is proposed. For video compression based on block transforms, two zig-zag scan orders can be used which provide similar compression performance. The proposed method involves randomly selecting one of these two scan orders. In addition, the sign bit of the DC coefficients can be flipped randomly and when employed with the proposed...
In this brief, we present a reconfigurable architecture to implement variable block-size transforms (8-point, 16-point and 32-point) in HEVC. The scheme is based on internal sharing and reuse of transform coefficients and uses a novel two-level grouping strategy exploiting the mirror symmetry and mirror anti-symmetry of the coefficients. Additionally, we have adopted an adder-share strategy in the...
The Anti-Nuclear Antibody (ANA) clinical pathology test is commonly used to identify the existence of various diseases. A hallmark method for identifying the presence of ANAs is the Indirect Immunofluorescence method on Human Epithelial (HEp-2) cells, due to its high sensitivity and the large range of antigens that can be detected. However, the method suffers from numerous shortcomings, such as being...
Steganography is the science and art of covert communication. Its objective is to hide the most secret messages into a cover object with the least possible statistical detectability. In practice, this is generally realized by a framework of minimal distortion embedding. This paper presents an efficient JPEG steganographic scheme based on syndrome trellis coding (STC) and a uniform embedding strategy,...
One of the serious challenges facing smartphones and other portable devices is battery life. We aim at improving the energy efficiency of multimedia applications for improved battery life while maintaining an acceptable level of user experience. In this paper, we design a stochastic processing technique for JPEG to limit its energy consumption particularly on mobile devices. This is a first step towards...
This paper proposes an information hiding scheme based on the Context-based Adaptive Variable Length Coding (CAVLC) mode of entropy encoding in H.264/AVC video encoding standard. The scheme hides information in the process of encoding the trailing coefficient in CAVLC, just in luminance (luma) components of 4x4 DCT data blocks. By modifying the check sum of codeword encoded for the trailing coefficient...
The present paper provides transform bases with improved normality and orthogonality properties based on the integer DCT of high-efficiency video coding (HEVC). The proposed transform bases improve the normality and orthogonality properties compared to the HEVC transform bases. Coding and re-encoding experiments were conducted using HEVC test model (HM) version 6.0 and the proposed method. The experiments...
Distributed Video Coding (DVC) is an emerging coding scheme that employs principles of source coding with side information (SI) at the decoder. In this paper, we present a new DVC encoder, named LORD (LOw-complexity, Rate-controlled, Distributed video coding system). No feedback channel is used in our encoder, and an adaptive noise model that varies both spatially and temporally is employed. The SI...
In the present digital world, Digital Rights Management (DRM) is essential to enforce persistent data protection right from the moment it is published. In spite of a need for DRM there are significant weaknesses in the current technology. Generally, DRM system is achieved with individual function modules of cryptography, fingerprinting and so on. In this typical system flow, all digital contents are...
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