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The recent light field imaging technology has been attracting a lot of interests due to its potential applications in a large number of areas including Virtual Reality, Augmented Reality (VR/AR), Teleconferencing, and E-learning. Light Field (LF) data is able to provide rich visual information such as scene rendering with changes in depth of field, viewpoint, and focal length. However, Light Field...
Nowadays, the development of video coders is resulting in significantly increased performance. Among all coder categories, fine grain scalable video coders have the chance to show great advantage by freely extracting code-streams with different bitrates, resolutions, and frame rates from one source-coded bit file to satisfy the various requirements of subscribers in a multicast network. Based on the...
Two layer coding based on JPEG 2000 for HDR images was proposed. The proposed coding scheme, referred to as extended JPEG XT, is an extension of JPEG XT Profile A, and takes advantages as follows: freely bit rate controllability, high compression efficiency, available for over-eight-bits LDR images, and so on. In this paper, some experimental results for the quality of the reconstructed HDR images...
There is an overwhelming variety of multimedia ontologies used to narrow the semantic gap, many of which are overlapping, not richly axiomatized, do not provide a proper taxonomical structure, and do not define complex correlations between concepts and roles. Moreover, not all ontologies used for image annotation are suitable for video scene representation, due to the lack of rich high-level semantics...
Due to the diversity in todays communication networks, adaptability is one of the key requirements in development of a quality multimedia streaming client. In this paper, a system for verification of Hybrid Broadcast Broadband TV (HbbTV) standard, with special emphasis on the Moving Picture Experts Group Dynamic Adaptive Streaming over Hypertext Transfer Protocol (MPEG-DASH) functionality, is given...
As part of a new MPEG-A standardization activity, called Visual Identity Management Application Format (VIMAF), this paper presents an end-to-end encryption solution of Region of Interest (ROI) in both AVC and HEVC encoded streams for privacy protection applications. This solution uses a selective encryption method that encrypts only the most sensitive information of the video and proposes a new adapted...
Recent advances in capturing and display technologies, as well as the proliferation of platforms to share images on the Internet, will further increase the bandwidth and storage space required by image coding based applications. To reduce the image coding rate, some techniques taking into account the properties of the human visual system can be used. In this context, this paper proposes an inpainting...
JPEG 2000 is one of the most efficient and well performing standards for continuous-tone natural images compression. However, a compression performance loss may occur when encoding images with sparse or locally sparse histograms. Images of the later type include only a subset of the available intensity values implied by the nominal alphabet. This article proposes a new adaptive block-based histogram...
In this work we present a novel inpainting algorithm to gain reduced acquisition time and high quality data reconstruction for MRI applications. We analyzed MRI recordings of two synthetically generated and of one real measured data set. On the basis of the proposed mask-based sampling trajectories, patients only have to spend a fraction of the recording time in the MRI. Especially, in the range of...
An image corresponds to a grid of pixels in digital image processing and the numerical value of each pixel represents image intensity. Characteristics and effects of image smoothing and other similar filtering operations, image enhancement, image distortion, etc. can be evaluated using local variance variation of image intensity. Image obtained after compression and blurring are examples of distorted...
Extracting image features effectively and efficiently is an important issue in the area of image processing and matching. Most existing methods deal with images in the pixel domain while almost all digital images such as JPEG images are stored and processed in compressed domain where discrete cosine transform (DCT) -based method is used as one of the most popular data compression techniques. In this...
The strain imposed by the bandwidth demands of multimedia applications on wired and wireless networks calls for efficient novel solutions to the problem of network resource allocation, to avoid significant packet losses. In this letter, we focus on a large variety of MPEG-4, H.264 and H.265-encoded video traces. We use the metaheuristic technique of Simulated Annealing to predict the size of B-frames,...
The key frame extraction helps us to make obtainable summary of a video. After studying a variety of diverse methods of Key frame extraction, we will have comparative analysis of the methods depending on their important features and result. If we want to present the entire video within a squat interval of time, video summary becomes the best alternative for this. This has become a very essential work...
Huge numbers of images are produced today with advent of the 'big data' era. To store and transmit data traditional compression methods are no longer satisfying. In this paper, we face this challenge and to achieve a higher compression rate we are taking the advantage of the correlations existing between images. An image compression system that encodes each image by referencing its correlated images...
Content Based Image Retrieval (CBIR) system receives paramount importance now days. This is because of its wide applicability found in many areas including medical, science, security, Bioinformatics and entertainments. It has emerged as one of the growing field of research in engineering and the sciences. CBIR system searches large image database based on the contents of the images. The recent work...
ISO recently published a new image compression standard, JPEG XT, which extends the popular JPEG standard towards higher dynamic range, compression of alpha channels and lossless coding. In part 7 ofJPEG XT, a two-layer lossy image compression for HDR images isintroduced that reconstructs HDR signals by the combination of a baselayer following the legacy JPEG standard, and an extension layer thatenlarges...
The capability to automatically evaluate the quality of long wave infrared (LWIR) and visible light images has the potential to play an important role in determining and controlling the quality of a resulting fused LWIR-visible image. Extensive work has been conducted on studying the statistics of natural LWIR and visible light images. Nonetheless, there has been little work done on analyzing the...
Audio players form a type of frequently used software, in which there are still bugs. In this paper, we investigate the test on MP3 for audio player, a mainstream audio format. An MP3 file consists of ID3v2 tag and MPEG layer III frames, with which there are standards for them. We first introduce the standards through the official documents, then summarize several potentially error-prone points for...
There is an ever increasing amount of video data sets which comprise additional metadata, such as object labels, tagged events, or gaze data. Unfortunately, metadata are usually stored in separate files in custom-made data formats, which reduces accessibility even for experts and makes the data inaccessible for non-experts. Consequently, we still lack interfaces for many common use cases, such as...
We have implemented a mixed reality telepresence platform providing a user experience (UX) of exchanging emotional expressions as well as information among a group of participants. The implemented system provides a platform to experience an immersive live scene through a Head-Mounted Display (HMD) and sensory information to a VR HMD user at a remote place. Moreover, the user at a remote place can...
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