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Low-complexity error concealment techniques for missing macroblock (MB) recovery based on the boundary matching principle are extensively studied and evaluated. In this paper, an improved boundary matching algorithm (BMA) using adaptive search is presented to conceal channel errors in inter-frames of video images. The proposed scheme adaptively selects proper candidate regions to conceal the artifact...
This paper proposes a novel steganography scheme based on Genetic Algorithm. The novel scheme embeds data by using a mapping function based on Genetic Algorithm in 8×8 blocks on the cover image. The optimal pixel adjustment process is applied after embedding the message. GA and Optimal Pixel Adjustment Process are used to obtain an optimal permutation to reduce the difference error between the cover...
This paper presents a novel data-hiding scheme based on side-match vector quantization (SMVQ). While encoding a block of an image, a traditional SMVQ data-hiding scheme only considers the neighboring pixels of the block to be encoded to produce a state codebook, and then uses the index of the closest codeword in the state codebook to represent the block. The major problem of the traditional image...
This paper presents a multilevel reversible data hiding method based on histogram shifting which can recover the original image in lossless way after the hidden data has been extracted from the stego image. The method generates a residual image using the prediction method to explore the similarity of neighboring and residual image, which comes from the difference between central pixel and its neighboring...
Image compression techniques such as Vector Quantization(VQ), Block Truncation Coding(BTC) and their hybrid methods, are widely used in many applications. Hiding secret data in image compression codes becomes necessary and attractive. In this paper, a data hiding approach in block truncation coding is presented. The proposed method hides secret data in compressed images by modifying the bitmaps generated...
3D scene information can be represented in several ways. In applications based on a (N-)view plus (N-)depth representation, both view and depth data is compressed. In this paper we present a depth compression method containing an depth up-sample filter which uses the color view as prior. Our method of depth down-/up-sampling is able to maintain clear object boundaries in the reconstructed depth maps...
This paper proposes a Sub-block Combination Fractional Motion Estimation (SCFME) algorithm for the H.264/AVC video encoder. Fractional Motion Estimation (FME) performs interpolation for the overlapped pixels which increases the computational complexity. The proposed sub-block combination algorithm can reduce the computational complexity by eliminating the overlapped pixel interpolation. Compared with...
Existing video coding standards always employ line-based intra prediction for intra frame coding. However, it sometimes does not perform well for the bottom-right boundary pixels due to the low correlation with the referenced pixels. In this paper, we propose a novel joint line and pixel prediction (JLPP) method to compensate the performance degradation of boundary pixels. In JLPP, each block is partitioned...
India is praised for its rich past and the culture. The rich heritage of the country has been carried over generations through the manuscripts and historic writings. A great deal of effort is being made to prevent their further degradation. A lot of research is also done in finding methods to digitize these documents so that they can be immortalized. But in order to achieve this, the noise in the...
The important issue of modern communication is establishing secret communication while using public channel and is achieved by steganography. In this paper, we propose Coherent Steganographic Technique using Segmentation and Discrete Cosine Transform (CSSDCT). The cover image is divided into 8*8 blocks and DCT is applied on each block. The number of payload MSB bits is embedded into DCT coefficients...
An alternative form of stereoscopic video is the combination of 2-D video from an ordinary 2-D video camera and depth information from a laser range or depth camera. When this type of 3-D video is compressed and transmitted over error prone channels, the associated packet loss leads to poor visual quality. Therefore, a depth image-based error concealment for 3-D video transmission is proposed, which...
Image quality assessment (IQA) is very important for many image and video processing applications, e.g. compression, archiving, restoration and enhancement. An ideal image quality metric should achieve consistency between image distortion prediction and psychological perception of human visual system (HVS). Inspired by that HVS is quite sensitive to image local orientation features, in this paper,...
This paper aims to obtain an integrated and consecutive original image from noisy image by applying image denoising method. Proposed method employs an “impulse noise detector” to detect the noisy pixels, and an “edge-preserving filter” to reconstruct the intensity values of noisy pixels. Extensive experimental results demonstrate that proposed method can obtain better performances in terms of Peak-to-Signal-Noise-Ratio(PSNR)...
In this paper, a direction-oriented covariance based deinterlacing method is presented. First, the local direction of edge is determined by modified edge-based line average (MELA) method. Then, based on the geometric duality, the optimal interpolation coefficients for the neighbor pixels of corresponding direction are estimated using the Wiener filtering. Experimental results prove that the proposed...
Reversible data hiding is a technique not only the secret data can be extracted from a covered image but also the cover image can be completely rebuilt after the extraction process. Therefore, it is the choice in cases of secret data hiding where the full recovery of the cover image is essential. In this paper, we propose a reversible data hiding technique based on Neighbor Mean Interpolation (NMI)...
Noise interference and data loss are two major problems that affect the processing results of image data transmission and storage. Restoration of the lost information of an image based on the existing information is the essence of inpainting. In this paper a new algorithm based on Sample and Hold interpolation and Iteration is proposed for reconstructing damaged images from existing regions and is...
We present a simple method for image denoising called power iteration denoising (PID). PID finds a low dimensional embedding of the image data using a truncated power iteration on a normalized pair-wise similarity matrix generated from the image. This embedding turns out to be an effective denoising algorithm outperforming the widely used non-local means algorithm. We apply this method to the denoising...
Multi-view video plus depth (MVD) format, which consists of texture and depth images, has been recently presented as video representation to support depth perception of scenes and efficient view generation at the arbitrary positions. In particular, a depth image has been one of the significantly important issues for successful services of highly advanced multi-media video applications, such as three-dimensional...
We propose a novel 3D space representation for multi-view video, using epipolar plane depth images (EPDI). Multi-view video plus depth (MVD) is used as common data format for FTV(Free-viewpoint TV), which enables synthesizing virtual view images. Due to large amount of data and complexity of the multi-view video coding (MVC), compression of MVD is a challenging issue. We address this problem and propose...
In this paper we propose a watermarking technique in the spatial domain using gray images. Algorithms based on modulo operations are developed to embed the watermark into the host image. Number of bits embedded in a pixel is determined by the degree of modulo algorithm being used. The size of the watermark is stored in the last few pixels as overhead bits. Extraction of data is done using the same...
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