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The JPEG committee (formally, ISO SC29 WG1) is currently standardizing a lightweight mezzanine codec for video over IP transport under the name JPEG XS. A particular challenging design constraint of this codec is multi-generation robustness, that is the necessity to minimize the error built-up under multiple re-compression cycles. In this paper, we discuss the sources of such errors, how they are...
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...
This paper presents a method to extract rendering matrix on multi-channel audio signals as an object fed to Moving Picture Expert Group Spatial Audio Object Coding (MPEG SAOC) encoder. This technique allows MPEG SAOC to transmit multiple multi-channel audio objects, instead of only a single multi-channel background object as specified in MPEG SAOC standard. Listening tests show that the proposed method...
This paper describes experimental evaluations of encoding parameters that are appropriate for MPEG-4 Audio Lossless Coding (ALS) to compress high-resolution audio. MPEG-4 ALS Simple Profile defines the values of encoding parameters, such as the maximum sampling frequency and quantization bit depth, for making it easier to implement in the receiving applications. However, ALS Simple Profile does not...
With the bottom-line goal of increasing the throughput of a GPU-accelerated JPEG 2000 encoder, this paper evaluates whether the post-compression rate control and packetization routines should be carried out on the CPU or on the GPU. Three co-processing models that differ in how the workload is split among the CPU and GPU are introduced. Both routines are discussed and algorithms for executing them...
Coding of signals with high amount of dense transient events, like applause, rain drops, etc., is usually a difficult task for perceptual audio coders. Especially at low bit rates, coding (and the associated coding noise) leads to smeared transients and a perceived increase in noise-like signal character. We propose a post-processing technique for coded/decoded applause-like signals which is based...
The representation of data in terms of its statistical properties is valuable in many applications. This work uses statistics obtained from 4D scene geometry to characterize, in terms of redundancy, the content produced by lenslet-based light field cameras and by high-density arrays of cameras for the JPEG Pleno Call for Proposals on Light Field Coding. This paper proposes a novel so-called geometric...
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...
In video coding, the transform-quantization scheme has been widely used to remove perceptual redundancy. Typically, transform and quantization are carried out separately for the prediction residuals. However, since the residual blocks commonly exhibit diverse spectral characteristics, the quantization with predefined constant dead-zone under a given parameter will inevitably deteriorate the compression...
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...
In order to improve the error resistance and security of JPEG2000 standard, a joint source channel and security arithmetic coding/decoding scheme for EBCOT in JPEG2000 is proposed. Based on error resistant arithmetic coding, this scheme inserts multiple forbidden symbols and generates secure two-way decodable bitstream controlled by chaotic maps, improving the security of the scheme. Meanwhile, at...
We consider the compression artifacts reduction problem, where a compressed image is transformed into an artifact-free image. Recent approaches for this problem typically train a one-to-one mapping using a per-pixel L_2 loss between the outputs and the ground-truths. We point out that these approaches used to produce overly smooth results, and PSNR doesnt reflect their real performance. In this paper,...
The latest High Efficiency Video Coding (HEVC) has been increasingly used to generate video streams over Internet. However, the decoded HEVC video streams may incur severe quality degradation, especially at low bit-rates. Thus, it is necessary to enhance visual quality of HEVC videos at the decoder side. To this end, we propose in this paper a Decoder-side Scalable Convolutional Neural Network (DS-CNN)...
This paper proposes a color attribute compression method for MPEG Point Cloud Compression (PCC) by exploiting the spatial redundancy among the adjacent points. With the increased interest in representing real-world surface as 3D point clouds, compressing the attributes (i.e., colors and normal directions) of point cloud has attracted great attention in MPEG. The proposed method is based on grouping...
A new two-layer coding scheme based on JPEG 2000 is proposed for HDR images, where coded data consist of two layers: the base-layer for tone mapped LDR version of an HDR image and the enhancement layer. The paper considers the coding scheme as an extended version of the JPEG XT Profile A. JPEG coders used in JPEG XT are replaced with JPEG 2000 ones. Compared to normative JPEG XT coding, the proposed...
Computers with their growing demands have their applicability in every field, one of the applications is the computer vision, where the function of an human eye has been replaced by using various sensors to capture the environment in the similar way a human eye does. We know that capturing the environment through sensors lead to origin of various kinds of images and videos of different shapes and...
MPEG-4 high efficiency (HE) advanced audio coding (AAC) contains a useful tool called spectral band replication (SBR) to improve the coded audio quality at low bitrates. The SBR tool uses start-band frequency to determine from which frequency band replication starts. This paper describes an algorithm to dynamically determine this parameter based on the genre of the music content. The simulation results...
In October 2015, MPEG and ITU jointly launched the Joint Video Exploration Team (JVET) to prepare the next generation of video coding standard beyond HEVC. The tools added over HEVC, grouped into the Joint Exploration Model 3.0 (JEM-3.0), achieve over 25% of coding gains compared to HEVC for the Random-Access mode. In inter-coding mode, the transform stage consists in the Adaptive Multiple Transforms...
This paper improves a colorization-based image coding using image segmentation and adaptive colorspaces. Recently, various approaches for color image coding based on colorization have been presented. These methods utilize a YCbCr colorspace and transfer the luminance component by a conventional compression method. Then, the chrominance components are approximated from the luminance component using...
Picture compression could be a wide dynamic investigation space. In the present time, a few redesigns are made in compression systems and more advancements are imperative since the excitement for limit and transmission of visual data is perseveringly on an augmentation. This paper analyses compression utilizing visual redundancy and examines a couple of customary schemes used in picture compression,...
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