Real-Time Imaging最新文献_第5页

A versatile stereo implementation on commodity graphics hardware 一个通用的立体实现在商品图形硬件

Real-Time Imaging Pub Date : 2005-02-01 DOI: 10.1016/j.rti.2005.04.002

Ruigang Yang , Marc Pollefeys

引用次数: 75

An error resilient coding scheme for H.263 video transmission based on data embedding 一种基于数据嵌入的H.263视频传输容错编码方案

Real-Time Imaging Pub Date : 2005-02-01 DOI: 10.1016/j.rti.2005.01.003

Li-Wei Kang, Jin-Jang Leou

{"title":"An error resilient coding scheme for H.263 video transmission based on data embedding","authors":"Li-Wei Kang, Jin-Jang Leou","doi":"10.1016/j.rti.2005.01.003","DOIUrl":"https://doi.org/10.1016/j.rti.2005.01.003","url":null,"abstract":"<div>For entropy-coded H.263 video frames, a transmission error in a codeword will not only affect the underlying codeword but may also affect subsequent codewords, resulting in a great degradation of the received video frames. In this study, an error resilient coding scheme for real-time H.263 video transmission is proposed. The objective of the proposed scheme is to recover high-quality H.263 video frames from the corresponding corrupted video frames.At the encoder, for an H.263 intra-coded I frame, the important data (the codebook index) for each macroblock (MB) are extracted and embedded into another MB within the I frame by the proposed data embedding scheme for I frames. For an H.263 inter-coded P frame, the important data (the coding mode and motion vector information) for each group of blocks (GOB) are extracted and embedded into the next frame by the proposed MB-interleaving GOB-based data embedding scheme. At the decoder, after all the corrupted MBs within an H.263 video frame are detected and located, if the important data for a corrupted MB can be extracted correctly, the extracted important data will facilitate the employed error concealment scheme to conceal the corrupted MB. Otherwise, the employed error concealment scheme is simply used to conceal the corrupted MB. As compared with some recent error resilient approaches, in this study the important data selection mechanism for different types of MBs, the detailed data embedding mechanism, and the error detection and concealment scheme performed at the decoder are well developed to design an integrated error resilient coding scheme. Based on the simulation results obtained in this study, the performance of the proposed scheme is better than those of four existing approaches used for comparison. The proposed scheme can recover high-quality H.263 video frames from the corresponding corrupted video frames up to a video packet loss rate of 30% in real time.</div>","PeriodicalId":101062,"journal":{"name":"Real-Time Imaging","volume":"11 1","pages":"Pages 45-58"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.rti.2005.01.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136850760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards real-time object recognition using pairs of lines 走向实时目标识别使用对线

Real-Time Imaging Pub Date : 2005-02-01 DOI: 10.1016/j.rti.2005.02.001

Stuart Meikle , B.P. Amavasai , F. Caparrelli

{"title":"Towards real-time object recognition using pairs of lines","authors":"Stuart Meikle , B.P. Amavasai , F. Caparrelli","doi":"10.1016/j.rti.2005.02.001","DOIUrl":"10.1016/j.rti.2005.02.001","url":null,"abstract":"<div>This paper presents a description of the “Pairs Of Lines” object recognition algorithm used in the MIMAS Computer Vision toolkit. This toolkit was developed at Sheffield Hallam University and the “Pairs of Lines” method was used in a recent European Union funded project.1The algorithm was developed to enable a micro-robot system (Amavasai et al., InstMC Journal of Measurement and Control) to recognize geometric planar objects in real-time, in a noisy environment.The method involves using straight line segments which are extracted from both the known object models and from the visual scene that the objects are to be located in. Pairs of these straight lines are then compared. If there is a geometric match between the two pairs an estimate of the possible position, orientation and scale of the model in the scene is made. The estimates are collated, as all possible pairs of lines are compared. The process yields the position, orientation and scale of the known models in the scene. The algorithm has been optimized for speed.This paper describes the method in detail and presents experimental results which indicate that the technique exhibits robustness to camera noise and partial occlusion and produces recognition in times under 1 s on a desktop PC. Recognition times are shown to be from 2 to 16 times faster than with the well-studied pairwise geometric histograms method. Recognition rates of up to 80% were achieved with scenes having signal to noise ratios of 2.5.</div>","PeriodicalId":101062,"journal":{"name":"Real-Time Imaging","volume":"11 1","pages":"Pages 31-43"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.rti.2005.02.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75938458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

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Real-Time Imaging Pub Date : 2005-02-01 DOI: 10.1016/S1077-2014(05)00033-1

引用次数: 0

Relations between bundle-adjustment and epipolar-geometry-based approaches, and their applications to efficient structure from motion 基于束平差和极几何的方法之间的关系及其在运动有效结构中的应用

Real-Time Imaging Pub Date : 2004-12-01 DOI: 10.1016/j.rti.2004.10.001

Youngmo Han

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引用次数: 7

Robust minimization of lighting variation for real-time defect detection 实时缺陷检测中光照变化的鲁棒最小化

Real-Time Imaging Pub Date : 2004-12-01 DOI: 10.1016/j.rti.2004.08.001

Edmund Y. Lam

引用次数: 4

Vectorial morphological reconstruction for brightness elimination in colour images 彩色图像亮度消除的矢量形态重建

Real-Time Imaging Pub Date : 2004-12-01 DOI: 10.1016/j.rti.2004.10.002

F. Ortiz, F. Torres

引用次数: 37

Incremental Hough transform: an improved algorithm for digital device implementation 增量霍夫变换:一种用于数字设备实现的改进算法

Real-Time Imaging Pub Date : 2004-12-01 DOI: 10.1016/j.rti.2004.07.001

O. Djekoune, K. Achour