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3D scene rendering requires depth maps and color information to produce high quality 3D results. Unfortunately, depth maps captured with the Time-of-flight (TOF) cameras have limited resolution and poor image quality, being severely influenced by the random and systematic noise, which makes them inapposite for generating high quality 3D images. In this paper, we have further analyzed a framework for...
In this paper, an objective assessment model based on three-component weighted structural similarity is presented for stereoscopic image. Since different distortions affect details of stereoscopic image differently, the image is classified into three kinds of regions including edge, smooth and texture regions so that different weights are associated to different regions to assess distorted stereoscopic...
The adaptive weighting based on the intensity variations of the neighbor pixels and the distance between the neighbor pixels and a pixel to be interpolated is proposed for the edge-based deinterlacing method. The local edge direction is first determined by the modified edge-based line averaging (MELA) method. Then, according to the local edge direction, the inverse distance and intensity variation...
In this paper, we propose a 3DTV system supporting delivery of full HD resolution 3DTV contents over HFC network. So far, we have used a 3DTV system supporting only frame-compatible format of 3DTV contents in order to provide 3DTV broadcasting service over HFC network. Using the frame-compatible format has an advantage being compatible with the current digital cable broadcasting system when transmitting...
Edge preserving smoothing prior to image segmentation is very important, since the image detailed information is mostly in edges, and smoothing uncorrupted pixels can sharply reduce the image quality. Hence, a novel noise detection method is essential to identify the noised pixels and noise-free pixels. In this paper, the noise detection is based on the difference between the pixel of interest value...
This paper presents a proposal for transmitting and recovering images using Multiple Description Coding (MDC) techniques over unreliable multiple links in a mesh network, while using network coding technique to add a protection path. In pure MDC, the loss of one description degrades the received image quality. In the proposed technique, the protection path ensures that all the descriptions are received...
Steganography, a technique of data hiding, is becoming more and more significant with expansion of the Internet communication. As a result, various steganographic algorithms have been proposed in recent years, for example, Ni et al. have carried out a lossless data-hiding algorithm based on the histogram modification. In order to reinforce more security and more data embedding capacity, this paper...
Two steps were taken to extract image feature points. One is to use some image processing technology to improve image quality, namely the image preprocessing, second is the accurate extraction of the characteristic point and lines. An improved Harris corner detection operator and sub-pixel corner detection feature extraction were implemented for the accident scene calibration object to improve the...
The original Adaptive-Edge method proposed by Yang et al. is a novel adaptive least significant bit steganographic method that provides a larger embedding capacity and imperceptible stego images. In this paper, we propose an improved version of Adaptive-Edge method by changing the readjusting phase. The original readjusting phase is just executed for the pixel pairs whose difference values belong...
Impulse noise removal is a very important preprocessing operation in many computer vision applications. This paper presents a noise removal approach based on a simple conditional technique. As evaluations show, the presented technique performs significantly better than standard median filter and achieves superior image quality. Experimental FPGA implementation of the proposed technique for window...
In this work, we propose a new frame rate conversion algorithm (FRCA) based on adaptive motion estimation and compensation. In the proposed algorithm, an adaptive diamond strategy is firstly used to find out all the motion vectors for each block by adaptively applying diamond algorithm in the current frame. Secondly, the motion vector for each block is further refined by full search algorithm to reduce...
The performance evaluation of watermarking scheme is done by two performance metrics: perceptual transparency and robustness. Perceptual transparency refers quality of image which is measured by `Peak Signal to Noise Ratio' (PSNR). Robustness is measured in terms of `Correlation Factor' (ρ). A good quality watermarking scheme should have maximum PSNR, ideally Correlation Factor equals to...
In the presented research on codebook optimization for vector quantization, an associative memory architecture is applied, which searches the most similar data among previously stored reference data. For realizing the learning function of new codebook data, a learning algorithm is implemented, which is based on this associative memory and which imitates the concept of the human short/long-term memory...
Exposure Fusion and other HDR techniques generate well-exposed images from a bracketed image sequence while reproducing a large dynamic range that far exceeds the dynamic range of a single exposure. Common to all these techniques is the problem that the smallest movements in the captured images generate artefacts (ghosting) that dramatically affect the quality of the final images. This limits the...
Fractal image compression explores the self-similarity property of a natural image and utilizes the partitioned iterated function system (PIFS) to encode it. This technique is of great interest both in theory and application. in this paper a new technique is proposed that improves fractal image compression by use of no-search scheme and local search with honey bee mating optimization. This method...
Transmission of compressed video over error prone channels may result in packet losses or errors, which can significantly degrade the image quality. Such degradation even becomes worse in 1Seg video broadcasting, which is widely used in Japan and Brazil for mobile phone TV service recently, where errors are drastically increased and lost areas are contiguous. Therefore the errors in earlier concealed...
Retinal images are used for the automated diagnosis of diabetic retinopathy. The retinal image quality must be improved for the detection of features and abnormalities and for this purpose segmentation of retinal images is vital. In this paper, we present a novel automated approach for segmentation of colored retinal images. Our segmentation technique smoothes and strengthens images by separating...
Image records are of extreme importance in the security technology. Recent color photographic cameras are mostly constructed in a single-chip sensor configuration and the color splitting structure is designed as a planar filter array, therefore some interpolation technique has to be used to compute full-color image. The final image quality is affected by selected interpolation technique. The applied...
A new type of digital filter for removing impulsive noise from color images is proposed using interactive evolutionary computing. This filter is realized as a rule-based system with interpolation technique considering the correlation among color components. This filter first detects the pixels on which impulsive noise is added on each RGB channel, based on the rules concerning the peculiarity of the...
Augmented reality aims to insert virtual objects in real scenes. In order to obtain a coherent and realistic integration, these objects have to be relighted according to their positions and real light conditions. They also have to deal with occlusion by nearest parts of the real scene. To achieve this, we have to extract photometry and geometry from the real scene. In this paper, we adapt high dynamic...
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