Search results for: Patrick Le Callet

Items from 1 to 20 out of 120 results

article

MPEG-4 AVC stream-based saliency detection. Application to robust watermarking

Marwa Ammar, Mihai Mitrea, Marwen Hasnaoui, Patrick Le Callet

Signal Processing: Image Communication > 2018 > 60 > C > 116-130

By bridging uncompressed-domain saliency detection and MPEG-4 AVC compression principles, the present paper advances a methodological framework for extracting the saliency maps directly from the stream syntax elements. In this respect, inside each GOP, the intensity, color, orientation and motion elementary saliency maps are related to the energy of the luma coefficients, to the energy of chroma coefficients,...

article

Learning visual saliency from human fixations for stereoscopic images

Yuming Fang, Jianjun Lei, Jia Li, Long Xu, more

Neurocomputing > 2017 > 266 > C > 284-292

In the previous years, a lot of saliency detection algorithms have been designed for saliency computation of visual content. Recently, stereoscopic display techniques have developed rapidly, which results in much requirement of stereoscopic saliency detection for emerging stereoscopic applications. Different from 2D saliency prediction, stereoscopic saliency detection methods have to consider depth...

chapter

Video quality perception in telesurgery

Lucie Leveque, Hantao Liu, Christine Cavaro-Menard, Yongqiang Cheng, more

2017 IEEE 19th International Workshop on Multimedia Signal Processing (MMSP) > 1 - 5

2017 IEEE 19th International Workshop on Multimedia Signal Processing (MMSP)

Telesurgery enables an expert surgeon to assist a remote surgeon during a surgical intervention, which benefits patient care in resource-poor settings. In reality, videos of surgical procedures are compressed and transmitted over large distances in real time and, therefore, are subject to a wide variety of distortions. These distortions degrade the quality of videos and potentially affect the performance...

article

Visual Attention Modeling for Stereoscopic Video: A Benchmark and Computational Model

Yuming Fang, Chi Zhang, Jing Li, Jianjun Lei, more

IEEE Transactions on Image Processing > 2017 > 26 > 10 > 4684 - 4696

In this paper, we investigate the visual attention modeling for stereoscopic video from the following two aspects. First, we build one large-scale eye tracking database as the benchmark of visual attention modeling for stereoscopic video. The database includes 47 video sequences and their corresponding eye fixation data. Second, we propose a novel computational model of visual attention for stereoscopic...

article

Proof-of-concept: role of generic content characteristics in optimizing video encoders

Ahmed Aldahdooh, Marcus Barkowsky, Patrick Le Callet

Multimedia Tools and Applications > 2018 > 77 > 13 > 16069- 16097

The influence of content characteristics on the efficiency of redundancy and irrelevance reduction in video coding is well known. Each new standard in video coding includes additional coding tools that potentially increase the complexity of the encoding process in order to gain further rate-distortion efficiency. In order to be versatile, encoder implementations often neglect the content dependency...

chapter

CNN-based transform index prediction in multiple transforms framework to assist entropy coding

Saurabh Puri, Sebastien Lasserre, Patrick Le Callet

2017 25th European Signal Processing Conference (EUSIPCO) > 798 - 802

2017 25th European Signal Processing Conference (EUSIPCO)

Recent work in video compression has shown that using multiple 2D transforms instead of a single transform in order to de-correlate residuals provides better compression efficiency. These transforms are tested competitively inside a video encoder and the optimal transform is selected based on the Rate Distortion Optimization (RDO) cost. However, one needs to encode a syntax to indicate the chosen...

chapter

Image quality assessment for free viewpoint video based on mid-level contours feature

Suiyi Ling, Patrick Le Callet

2017 IEEE International Conference on Multimedia and Expo (ICME) > 79 - 84

2017 IEEE International Conference on Multimedia and Expo (ICME)

Free view point video (FVV), which offers immersive experience to users with multiple views, is one of the new trends in advanced visual media. These new viewpoints are traditionally synthesized via depth image-based rendering(DIBR) and geometric distortions are therefore observed. Mid-level contours descriptors are capable of evaluating such edges incoherence among the synthesized images which common...

chapter

Which saliency weighting for omni directional image quality assessment?

Yashas Rai, Patrick Le Callet, Philippe Guillotel

2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX) > 1 - 6

2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX)

With the explosion of Virtual Reality technologies, the production and usage of omni directional images (a.k.a 360 images) is presenting new challenges in the domains of compression, transmission and rendering. The evaluation of the quality of images generated by these technologies is therefore paramount. As the exploration of 360 images within a Head-Mounted Display (HMD) is non-uniform, current...

chapter

Characterization and selection of light field content for perceptual assessment

Pradip Paudyal, Jesus Gutierrez, Patrick Le Callet, Marco Carli, more

2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX) > 1 - 6

2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX)

Light field technology may have a positive impact on several multimedia applications thanks to novel ways to explore the captured scenes, such as changing the parallax (horizontally and vertically) and refocusing the content. These innovative use cases require new considerations that affect the whole processing chain, from content acquisition to visualization, as well as the methodologies for quality...

article

Perceptual Reduced-Reference Visual Quality Assessment for Contrast Alteration

Min Liu, Ke Gu, Guangtao Zhai, Patrick Le Callet, more

IEEE Transactions on Broadcasting > 2017 > 63 > 1-1 > 71 - 81

In image/video systems, contrast adjustment which manages to enhance visual quality is nowadays an important research topic. Yet very limited struggles have been made to the exploration of visual quality assessment for contrast adjustment. To tackle the issue, this paper proposes a novel reduced-reference (RR) quality metric with the integration of bottom-up and top-down strategies. The former one...

chapter

Inpainting-based error concealment for low-delay video communication

Ahmed Aldahdooh, Marcus Barkowsky, David R. Bull, Patrick Le Callet

2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) > 1632 - 1636

2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Error concealment (EC) is one of the target applications of inpainting techniques. Some methods combine the estimated lost motion vectors (MVs) with the exemplar-based inpainting technique to recover the lost regions. Due to the erroneous motion vectors that might indicate a moving object as background object and vice versa, these methods are still showing visual artifacts in the recovered regions...

article

Quality Assessment of Sharpened Images: Challenges, Methodology, and Objective Metrics

Lukas Krasula, Patrick Le Callet, Karel Fliegel, Milos Klima

IEEE Transactions on Image Processing > 2017 > 26 > 3 > 1496 - 1508

Most of the effort in image quality assessment (QA) has been so far dedicated to the degradation of the image. However, there are also many algorithms in the image processing chain that can enhance the quality of an input image. These include procedures for contrast enhancement, deblurring, sharpening, up-sampling, denoising, transfer function compensation, and so on. In this paper, possible strategies...

article

Preference of Experience in Image Tone-Mapping: Dataset and Framework for Objective Measures Comparison

Lukas Krasula, Manish Narwaria, Karel Fliegel, Patrick Le Callet

IEEE Journal of Selected Topics in Signal Processing > 2017 > 11 > 1 > 64 - 74

The popularity of high dynamic range (HDR) imaging has grown in both academic and private research sectors. Since the native visualization of HDR content still has its limitations, the importance of dynamic range compression (i.e., tone-mapping) is very high. This paper evaluates observers’ preference of experience in context of image tone-mapping. Given the different nature of natural and computer-generated...

article

Study of Video Quality Assessment for Telesurgery

Lucie Leveque, Wei Zhang, Christine Cavaro-Menard, Patrick Le Callet, more

IEEE Access > 2017 > 5 > 9990 - 9999

Telemedicine provides a transformative practice for access to and delivery of timely and high-quality healthcare in resource-poor settings. In a typical scenario of telesurgery, surgical tasks are performed with one surgeon situated at the patient’s side and one expert surgeon from a remote site. In order to make telesurgery practice realistic and secure, reliable transmission of medical videos over...

chapter

An adaptive Lagrange multiplier determination method for dynamic texture in HEVC

Chengyue Ma, Karam Naser, Vincent Ricordel, Patrick Le Callet, more

2016 IEEE International Conference on Consumer Electronics-China (ICCE-China) > 1 - 4

2016 IEEE International Conference on Consumer Electronics-China (ICCE-China)

This research proposed a method for adaptive Lagrange multiplier determination for rate-distortion optimization with dynamic texture in High Efficiency Video Coding (HEVC). Inspired by the experimental results of the Lagrange multiplier selection test, the presented approach adaptively predicts the optimum Lagrange multiplier for different dynamic texture sequences, based on the features of the dynamic...

article

Saliency-based stereoscopic image retargeting

Yuming Fang, Junle Wang, Yuan Yuan, Jianjun Lei, more

Information Sciences > 2016 > 372 > C > 347-358

In this paper, we propose a new saliency based stereoscopic image retargeting method based on the characteristics of the Human Visual System (HVS). A new stereoscopic saliency detection method is designed by adopting low-level features of intensity, color, texture and depth. Besides, the viewing bias factors including center bias and depth bias existing in the HVS are adopted for stereoscopic visual...

chapter

Effect of content features on short-term video quality in the visual periphery

Yashas Rai, Ahmed Aldahdooh, Suiyi Ling, Marcus Barkowsky, more

2016 IEEE 18th International Workshop on Multimedia Signal Processing (MMSP) > 1 - 6

2016 IEEE 18th International Workshop on Multimedia Signal Processing (MMSP)

The area outside our central field of vision, also referred to as the visual periphery, captures most information in a visual scene, although much less sensitive than the central Fovea. Vision studies in the past have stated that there is reduced sensitivity of texture, color, motion and flicker (temporal harmonic) perception in this area, that bears an interesting application in the domain of quality...

article

A Universal Framework for Salient Object Detection

Jianjun Lei, Bingren Wang, Yuming Fang, Weisi Lin, more

IEEE Transactions on Multimedia > 2016 > 18 > 9 > 1783 - 1795

In this paper, we propose a novel universal framework for salient object detection, which aims to enhance the performance of any existing saliency detection method. First, rough salient regions are extracted from any existing saliency detection model with distance weighting, adaptive binarization, and morphological closing. With the superpixel segmentation, a Bayesian decision model is adopted to...

chapter

Modeling the perceptual distortion of dynamic textures and its application in HEVC

Karam Naser, Vincent Ricordel, Patrick Le Callet

2016 IEEE International Conference on Image Processing (ICIP) > 3787 - 3791

2016 IEEE International Conference on Image Processing (ICIP)

In the quest of perceptually optimized video coding, coding textures is representing a challenging case. While a large body of research was put into the perception of static textures, dynamic textures are still not sufficiently explored. In this paper, we focus on short term consistent patches, known as dynamic textures, with a very limited spatial and temporal extent. We estimated the visual distortion...

chapter

Role of HEVC coding artifacts on gaze prediction in interactive video streaming systems

Yashas Rai, Patrick Le Callet, Gene Cheung

2016 IEEE International Conference on Image Processing (ICIP) > 3344 - 3348

2016 IEEE International Conference on Image Processing (ICIP)

Sensitivity to spatial details drops across the visual periphery, and hence video streaming systems that gracefully degrades quality away from the viewpoint of the observer, provides an optimum viewing experience with potentially large bitrate savings. As reaction latency is an important performance parameter of such systems, good prediction of future gaze locations at the transmission end is very...

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INFONA - science communication portal

Search results for: Patrick Le Callet

MPEG-4 AVC stream-based saliency detection. Application to robust watermarking

Learning visual saliency from human fixations for stereoscopic images

Video quality perception in telesurgery

Visual Attention Modeling for Stereoscopic Video: A Benchmark and Computational Model

Proof-of-concept: role of generic content characteristics in optimizing video encoders

CNN-based transform index prediction in multiple transforms framework to assist entropy coding

Image quality assessment for free viewpoint video based on mid-level contours feature

Which saliency weighting for omni directional image quality assessment?

Characterization and selection of light field content for perceptual assessment

Perceptual Reduced-Reference Visual Quality Assessment for Contrast Alteration

Inpainting-based error concealment for low-delay video communication

Quality Assessment of Sharpened Images: Challenges, Methodology, and Objective Metrics

Preference of Experience in Image Tone-Mapping: Dataset and Framework for Objective Measures Comparison

Study of Video Quality Assessment for Telesurgery

An adaptive Lagrange multiplier determination method for dynamic texture in HEVC

Saliency-based stereoscopic image retargeting

Effect of content features on short-term video quality in the visual periphery

A Universal Framework for Salient Object Detection

Modeling the perceptual distortion of dynamic textures and its application in HEVC

Role of HEVC coding artifacts on gaze prediction in interactive video streaming systems

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