{"id":13582,"date":"2023-08-14T03:15:35","date_gmt":"2023-08-14T03:15:35","guid":{"rendered":"https:\/\/www.rayzeek.com\/?p=13582"},"modified":"2023-12-26T08:39:00","modified_gmt":"2023-12-26T08:39:00","slug":"what-is-luminance-ratio","status":"publish","type":"post","link":"https:\/\/www.rayzeek.com\/fr\/glossaire\/quest-ce-que-le-rapport-de-luminance","title":{"rendered":"Qu'est-ce que le rapport de luminance ?"},"content":{"rendered":"

Qu'est-ce que le rapport de luminance ?<\/h2>

Le rapport de luminance est le rapport entre la luminance moyenne et la luminance de la fen\u00eatre. Il sert d'indicateur du contraste de luminosit\u00e9 entre une source de lumi\u00e8re du jour et l'ensemble du champ visuel. Ce rapport est utilis\u00e9 comme variable dans les mod\u00e8les qui analysent et comparent les performances des syst\u00e8mes d'\u00e9clairage, en tenant compte de facteurs tels que l'\u00e9clairement vertical, la position de l'ombre et le rapport de luminance.<\/p>

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Le rapport de luminance est utile pour \u00e9valuer les performances optiques et la qualit\u00e9 des syst\u00e8mes d'\u00e9clairage et des appareils \u00e9lectroniques, en particulier les \u00e9crans. Il est utilis\u00e9 comme param\u00e8tre pour tester le rapport de luminance, la couleur et l'uniformit\u00e9. En \u00e9valuant le rapport de luminance, on peut d\u00e9terminer la lisibilit\u00e9 et le confort visuel d'un \u00e9cran, en tenant compte de la luminosit\u00e9 de la lumi\u00e8re ambiante par rapport \u00e0 la luminosit\u00e9 de l'\u00e9cran.<\/p>

En outre, le rapport de luminance est essentiel pour comprendre le contraste per\u00e7u et le confort visuel. Par exemple, dans le cas d'une symbologie claire sur fonc\u00e9e, le rapport de luminance entre l'arri\u00e8re-plan et les pixels les plus lumineux constituant le symbole influe sur le contraste per\u00e7u. Les lignes directrices recommandent des rapports de luminance sp\u00e9cifiques entre les objets et leur arri\u00e8re-plan en fonction du degr\u00e9 de perceptibilit\u00e9 ou de saillance souhait\u00e9, soulignant le r\u00f4le du rapport de luminance dans l'am\u00e9lioration de la visibilit\u00e9 et du confort visuel.<\/p>

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En outre, le rapport de luminance est \u00e9galement un facteur d'\u00e9valuation de la non-uniformit\u00e9 et des param\u00e8tres de l'\u00e9clairage int\u00e9rieur. L'Illuminating Engineering Society of North America (IESNA) a \u00e9tabli des lignes directrices qui d\u00e9finissent les niveaux acceptables de non-uniformit\u00e9 en utilisant les rapports de luminance entre les surfaces dans le champ de vision. Une repr\u00e9sentation pr\u00e9cise des distributions de luminance des fen\u00eatres et des rapports de luminance int\u00e9rieurs est essentielle pour \u00e9valuer le confort visuel et les mesures de performance \u00e0 l'aide de techniques telles que l'\u00e9clairage bas\u00e9 sur l'image (IBL).<\/p>","protected":false},"excerpt":{"rendered":"

Le rapport de luminance est le rapport entre la luminance moyenne et la luminance de la fen\u00eatre. Il sert d'indicateur du contraste de luminosit\u00e9 entre une source de lumi\u00e8re du jour et l'ensemble du champ visuel.<\/p>","protected":false},"author":4,"featured_media":12865,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"article_term":"","article_term_alternate":"","article_term_def":"","article_hook":"","auto_links":"[{\"keyword\": \"IESNA\", \"idxall\": 0, \"keywordtitlesimi\": 0.9568374156951904, \"keywordslugsimi\": 0.9568374156951904, \"paratitlesimi\": 0.5771031379699707, \"paraslugsimi\": 0.5771031379699707, \"slug\": \"what-is-iesna\", \"title\": \"What is IESNA\", \"id\": 14130}, {\"keyword\": \"visual field\", \"idxall\": 0, \"keywordtitlesimi\": 0.9420757293701172, \"keywordslugsimi\": 0.9420757293701172, \"paratitlesimi\": 0.6256347298622131, \"paraslugsimi\": 0.6256347298622131, \"slug\": \"what-is-visual-field\", \"title\": \"What is Visual Field\", \"id\": 14183}, {\"keyword\": \"uniformity\", 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