{"id":26557,"date":"2018-10-19T12:11:17","date_gmt":"2018-10-19T10:11:17","guid":{"rendered":"https:\/\/www.iemn.fr\/?page_id=26557"},"modified":"2025-09-03T10:32:58","modified_gmt":"2025-09-03T08:32:58","slug":"transmission-video-numerique","status":"publish","type":"page","link":"https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/transmission-video-numerique","title":{"rendered":"Digital video transmission systems"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_submenu  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_47_hcprsda2xsh2\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"bgposition:50% 50%;duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" 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href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/transmission-video-numerique'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Digital video transmission system<\/span><\/a><\/li><li class='menu-item av-112uerh-54ff7ef20b282f31c375c49ad52fc81d menu-item-top-level menu-item-top-level-5' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/systemes-de-communications-multi-utilisateurs'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Multi-User Communication Systems<\/span><\/a><\/li><li class='menu-item av-2y5yl8d-267fec6f349e612ad09455a904df84ee menu-item-top-level menu-item-top-level-6' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/projet-interreg-secuweb-crosss3'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Projet Interreg CrossS3 SecuWeb<\/span><\/a><\/li><li class='menu-item av-1bffh4t-d4b6be1450a0edcbf021a86b101e4c03 menu-item-top-level menu-item-top-level-7' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Other groups<\/span><\/a><\/li><\/ul><\/div><\/div><div id='after_submenu_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-26557'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-uak999-a2b436f72f63505095a3c35c863c6980\">\n#top .av-special-heading.av-uak999-a2b436f72f63505095a3c35c863c6980{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-uak999-a2b436f72f63505095a3c35c863c6980 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-uak999-a2b436f72f63505095a3c35c863c6980 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-uak999-a2b436f72f63505095a3c35c863c6980 av-special-heading-h2  avia-builder-el-2  el_after_av_submenu  el_before_av_textblock  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Topic: Digital video transmission systems<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n<section  class='av_textblock_section av-jnfuwmi8-8e4addc9a340e1aea655fb78d01a1d52'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div id=\"region-content\" class=\"grid-9 region region-content\">\n<div class=\"region-inner region-content-inner\">\n<div id=\"block-system-main\" class=\"block block-system block-main block-system-main odd block-without-title\">\n<div class=\"block-inner clearfix\">\n<div class=\"content clearfix\">\n<article id=\"node-page-5764\" class=\"node node-page node-published node-not-promoted node-not-sticky author-cdebail odd clearfix\">\n<div class=\"content clearfix\">\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p><strong>Manager:<\/strong> <a href=\"http:\/\/www.univ-valenciennes.fr\/DOAE\/sites\/default\/files\/pdf\/fiches\/Corlay.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Patrick CORLAY<\/a><\/p>\n<p align=\"justify\">This research theme concerns the study of original digital video communication systems that allow the optimization of the received video quality.<br \/>In order to ensure a high level of video quality at the user's end, we apply a joint approach of source and channel coding techniques, in order to optimize the transmission system parameters (Fig. 1). The work essentially calls upon two areas of expertise: still image and video coding (MPEG-2, 4 - H.264 AVC\/SVC coding and transcoding) and signal processing techniques dedicated to telecom systems (channel coding, hierarchical modulations, bit loading, channel estimation).<\/p>\n<div id=\"attachment_26572\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-26572\" class=\"wp-image-26572 size-full\" title=\"Figure 1: Illustration of a robust video transmission system based on unequal protection by bit and power loading.\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques1.jpg\" alt=\"Figure 1: Illustration of a robust video transmission system based on unequal protection by bit and power loading.\" width=\"540\" height=\"258\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques1.jpg 540w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques1-300x143.jpg 300w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/a><p id=\"caption-attachment-26572\" class=\"wp-caption-text\">Figure 1: Illustration of a robust video transmission system based on unequal protection by bit and power loading.<\/p><\/div>\n<p align=\"justify\">The areas of application are <strong>broadcast video over wired (ADSL, power lines, fiber optics) and wireless networks<\/strong>as well as <strong>video surveillance for transport security<\/strong> (CPER research program <a href=\"http:\/\/www.cisit.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">CISIT<\/a>). In this second case, the objective is to extend the joint source\/channel approach to robust MIMO-OFDM video transmission systems in the context of a video surveillance application between a vehicle (bus, subway) and a control station (security in ground transportation).<\/p>\n<p align=\"justify\">The results obtained have given rise to several publications and have recently been used in the project <strong>ANR TOSCANE: Optimized Video Transmission Source\/CAnal EchelonNablE (2007-2010)<\/strong>In particular, we have set up a demonstrator for broadcasting SVC-compressed HDTV streams over ADSL2 lines, with end-to-end quality optimization.<\/p>\n<h3>Major results<\/h3>\n<p align=\"justify\">On ADSL2 links, whose throughput capacity is mainly limited by the distance between the subscriber and the telephone exchange, the quality of high-speed video streaming depends strongly on this distance. We have proposed a <strong>a complete solution for the transmission of H264 AVC video streams in high definition that increases the distance of eligibility for HD IPTV services via ADSL by 1200 meters<\/strong>. In order to adapt to the available bitrate on the subscriber's telephone line, we have developed a low-complexity real-time H264\/AVC High Definition stream transcoder capable of reducing the initial video bitrate by a factor of 2. The transmission of the bit-rate-adapted video stream by transcoding is then optimized through an adaptive bit and power allocation on the ADSL sub-channels.<\/p>\n<div id=\"attachment_26575\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques2.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-26575\" class=\"wp-image-26575 size-full\" title=\"Figure 2\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques2.jpg\" alt=\"Figure 2\" width=\"540\" height=\"325\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques2.jpg 540w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques2-300x181.jpg 300w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/a><p id=\"caption-attachment-26575\" class=\"wp-caption-text\">Figure 2<\/p><\/div>\n<p align=\"justify\">In the case of PLC transmissions, the <strong>pilot carriers<\/strong> are used for the<strong>estimation of the electrical channel<\/strong> and therefore do not carry any information. We have sought to optimize the power distribution allocated to these carriers in order to maximize the quality of the channel estimation and thus the transmission. We have shown that even for a channel where the noise is highly colored (power lines), a uniform power distribution, easy to perform, is almost optimal.<\/p>\n<p align=\"justify\">One of the key points in the end-to-end optimization of a multicarrier DMT (Discrete Multitone Modulation) or OFDM (Orthogonal Frequency Division Multiplex) transmission chain is the optimization of the bit rate taking into account the allocated power and the electromagnetic compatibility constraints (Fig. 2). For this purpose, we have developed a <strong>fast bit and power allocation algorithm for multicarrier transmission<\/strong> which takes into account the symbol error rate, the spectral constraints of transmission power (power mask) and technological constraints of modulation order. The proposed algorithm offers significant advantages: O(N) algorithm, where N is the number of carriers, not requiring prior carrier scheduling. Compared to algorithms of the same family that load the entire target rate in two or three steps, the complexity of the final phase of the proposed algorithm (the remaining bits to be loaded) is in almost all cases specified in advance.<\/p>\n<div id=\"attachment_26577\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques3.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-26577\" class=\"wp-image-26577 size-full\" title=\"Figure 3: Characterization of the ADSL link according to the physical parameters of the line and the transmission environment.\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques3.jpg\" alt=\"Figure 3: Characterization of the ADSL link according to the physical parameters of the line and the transmission environment.\" width=\"540\" height=\"286\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques3.jpg 540w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques3-300x159.jpg 300w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/a><p id=\"caption-attachment-26577\" class=\"wp-caption-text\">Figure 3: Characterization of the ADSL link according to the physical parameters of the line and the transmission environment.<\/p><\/div>\n<p align=\"justify\">In the specific case of video surveillance applications, we have proposed two innovative video transmission schemes based on the combination of <strong>MIMO technologies<\/strong> with a <strong>multiple description coding<\/strong> on the one hand, and a <strong>scalable coding by regions of interest<\/strong> based on the FMO (Flexible Macroblock Ordering) tool on the other hand. The philosophy of these two techniques is different, but each of them allows the improvement of the robustness of the wireless link and especially the improvement of the quality of the received video signals even on spatially correlated MIMO channels. The figure below illustrates the performance in the case of video streams inside a train (Fig. 4).<\/p>\n<div id=\"attachment_26579\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques4.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-26579\" class=\"wp-image-26579 size-full\" title=\"Figure 4: Illustration of the received video quality with a traditional MIMO video transmission scheme (left), and the proposed area-of-interest MIMO video transmission scheme (right): in the second case, it can be seen that transmission errors do not affect the aggression area under surveillance.\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques4.jpg\" alt=\"Figure 4: Illustration of the received video quality with a traditional MIMO video transmission scheme (left), and the proposed area-of-interest MIMO video transmission scheme (right): in the second case, it can be seen that transmission errors do not affect the aggression area under surveillance.\" width=\"540\" height=\"216\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques4.jpg 540w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/transmissions_videos_numeriques4-300x120.jpg 300w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/a><p id=\"caption-attachment-26579\" class=\"wp-caption-text\">Figure 4: Illustration of the received video quality with a traditional MIMO video transmission scheme (left), and the proposed area-of-interest MIMO video transmission scheme (right): in the second case, it can be seen that transmission errors do not affect the aggression area under surveillance.<\/p><\/div>\n<h3>Work in progress - Prospects<\/h3>\n<p align=\"justify\">The extension of the methodology used for H.264\/AVC transcoding to other video coding schemes (SVC, then MVC for 3D audiovisual content) is being validated. We are also starting in January 2011 a study on the FPGA implementation of video pre-filtering techniques in order to optimize the H.264\/AVC compression of HDTV streams.<br \/>In the context of transmission over power lines, we have several channels available via power cables and we plan to perform a robust transmission of video surveillance streams using MIMO technologies. Finally, in another theme of the group, a solution has been developed to realize a MIMO transmission on optical fiber. The transmission of scalable lossless High Definition streams should soon be adapted to such a transmission medium.<\/p>\n<h3>Collaborations<\/h3>\n<p>THALES COMMUNICATIONS - THOMSON GRASS VALLEY - NETQOST - LIEN - IFFSTAR LEOST - DIGIGRA<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"parent":26078,"menu_order":16,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-26557","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=26557"}],"version-history":[{"count":3,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26557\/revisions"}],"predecessor-version":[{"id":74875,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26557\/revisions\/74875"}],"up":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26078"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=26557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}