{"id":2678,"date":"2020-06-01T23:36:32","date_gmt":"2020-06-02T03:36:32","guid":{"rendered":"https:\/\/melindaozel.com\/?p=2678"},"modified":"2025-03-18T12:03:56","modified_gmt":"2025-03-18T16:03:56","slug":"arkit-other-face-tracking-mistakes","status":"publish","type":"post","link":"https:\/\/melindaozel.com\/fr\/arkit-other-face-tracking-mistakes\/","title":{"rendered":"ARKit et autres erreurs de suivi des visages"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2678\" class=\"elementor elementor-2678\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1eb70452 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1eb70452\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-42ddc1c4\" data-id=\"42ddc1c4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-27f6f858 elementor-widget elementor-widget-text-editor\" data-id=\"27f6f858\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><em>Pourquoi tant de trackers de visage et d'avatars souffrent-ils d'un abaissement des sourcils faussement positif ? En utilisant l'ARKit d'Apple comme \u00e9tude de cas, cette analyse explore la racine du probl\u00e8me et r\u00e9v\u00e8le une solution \u00e9tonnamment simple \u00e0 la fin.\u00a0<\/em><\/p><h2>Avatars et sourires : \u00c9dition Memoji<\/h2><p>L'abaissement faussement positif des sourcils est un probl\u00e8me tr\u00e8s r\u00e9pandu dans le suivi des visages et l'animation des avatars. Bien que subtiles, ces erreurs peuvent d\u00e9former les expressions d'un avatar, introduisant des indices involontaires de tristesse, de col\u00e8re ou d'inqui\u00e9tude. Dans la vid\u00e9o ci-dessous, je teste le Memoji d'Apple pour d\u00e9montrer ce probl\u00e8me en action.<\/p><p>\u00a0<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe class=\"youtube-player\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/3LjvYjHRADc?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p><p>Dans le clip ci-dessus, observez comment mon Memoji \"refl\u00e8te\" mon sourire. Vous remarquez quelque chose d'\u00e9trange ou de d\u00e9sagr\u00e9able ? Mes arcades sourcili\u00e8res sont abaiss\u00e9es \u00e0 tort. L'ajout d'un abaissement des sourcils mal attribu\u00e9 persiste dans diff\u00e9rents types de sourires. Il persiste \u00e9galement chez d'autres utilisateurs.<\/p><p>Des sourcils int\u00e9rieurs abaiss\u00e9s associ\u00e9s \u00e0 une l\u00e8vre sup\u00e9rieure relev\u00e9e (caus\u00e9s par <em>rideau de nez <\/em>ou <em>l\u00e8vre sup\u00e9rieure<\/em>) est souvent associ\u00e9e \u00e0 des \u00e9motions d\u00e9sagr\u00e9ables. L'abaissement des sourcils est \u00e9galement en corr\u00e9lation n\u00e9gative avec le sourire. Ces types d'erreurs de suivi s\u00e9mantiquement significatives peuvent impliquer involontairement un sentiment n\u00e9gatif.<\/p><h2>Comment ces erreurs se produisent-elles ?<\/h2><p>Les abaissements de sourcils faussement positifs sont souvent dus \u00e0 des probl\u00e8mes de qualit\u00e9 des donn\u00e9es, \u00e0 des erreurs d'\u00e9tiquetage et \u00e0 des choix artistiques. Voici pourquoi ces probl\u00e8mes persistent :<\/p><ol><li>La qualit\u00e9 des donn\u00e9es n'est pas suffisamment prise en compte.<\/li><li>L'art n'est pas suffisamment mis en valeur.<\/li><\/ol><p>Partout o\u00f9 j'ai travaill\u00e9, on s'est tellement pr\u00e9occup\u00e9 d'embaucher des ing\u00e9nieurs ayant une formation sp\u00e9cifique que <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/melindaozel.com\/big-techs-homogeneous-hiring-habits-are-harming-our-data\/\" target=\"_blank\" rel=\"noopener noreferrer\">les effectifs sont soustraits \u00e0 d'autres r\u00f4les essentiels.<\/a><\/span><\/p><p>De nombreuses entreprises technologiques partent du principe que si elles acqui\u00e8rent suffisamment de donn\u00e9es pour entra\u00eener leur mod\u00e8le, les probl\u00e8mes de qualit\u00e9 se r\u00e9soudront d'eux-m\u00eames. Ouah ! C'est de la magie. Cette hypoth\u00e8se repose souvent sur la croyance suppl\u00e9mentaire (mais fausse) qu'il n'existe qu'un pourcentage n\u00e9gligeable de donn\u00e9es impures.<\/p><p>J'ai travaill\u00e9 dans les tranch\u00e9es des donn\u00e9es et j'ai occup\u00e9 presque toutes les fonctions non techniques dans le domaine de la tra\u00e7abilit\u00e9 des visages :<\/p><ul><li><strong>planification des donn\u00e9es<\/strong> - d\u00e9terminer le type de donn\u00e9es d'expression \u00e0 collecter et la mani\u00e8re de les collecter<\/li><li><strong>la collecte de donn\u00e9es<\/strong> - travailler r\u00e9ellement avec les participants et les former \u00e0 prendre les bonnes poses d'expression<\/li><li><strong>annotation des donn\u00e9es<\/strong> - d\u00e9terminer les meilleurs moyens de labelliser les points de rep\u00e8re<\/li><li><strong>classification des donn\u00e9es<\/strong> - conseiller l'ing\u00e9nierie sur les classes qui devraient exister, sur leurs param\u00e8tres et sur la mani\u00e8re de traiter leurs in\u00e9vitables cas de figure<\/li><li><strong>l'intensification<\/strong> - veiller \u00e0 ce que les r\u00e8gles d'annotation et de classification soient normalis\u00e9es et faciles \u00e0 comprendre par les \u00e9tiqueteurs de masse<\/li><li><strong>suivi du suivi<\/strong> - comparer la v\u00e9rit\u00e9 de terrain avec les r\u00e9sultats du suivi<\/li><li><strong>l'identification des domaines \u00e0 am\u00e9liorer<\/strong> - d\u00e9terminer quels sont les probl\u00e8mes existants et comment ils peuvent \u00eatre am\u00e9lior\u00e9s par la planification, la collecte, l'annotation et\/ou la classification<\/li><li><strong>d\u00e9veloppement d'avatars<\/strong> - l'\u00e9laboration de strat\u00e9gies pour d\u00e9finir les formes \u00e0 privil\u00e9gier en fonction d'un ensemble de consid\u00e9rations telles que<ul><li>en cas d'\u00e9chec du tracker<\/li><li>quels sont les cas d'utilisation du produit final<\/li><li>ce qui sera le plus esth\u00e9tique<\/li><li>ce qui est le plus important sur le plan s\u00e9mantique<\/li><\/ul><\/li><\/ul><p>Gr\u00e2ce \u00e0 mon exp\u00e9rience en science de l'expression, en anatomie faciale et \u00e0 mon travail approfondi sur les donn\u00e9es faciales, je peux affirmer en toute confiance que les donn\u00e9es impures constituent un probl\u00e8me majeur, et non mineur, dans le suivi des visages. En bref, m\u00eame si l'algorithme est parfait, des probl\u00e8mes surviennent :<\/p><p><strong>Donn\u00e9es impos\u00e9es impures<\/strong><\/p><ul><li>Lors de la collecte de donn\u00e9es sur l'expression pos\u00e9e de participants humains, les donn\u00e9es seront toujours contamin\u00e9es. C'est garanti.<\/li><li>La plupart des gens ne peuvent pas toucher toutes les expressions cibles. Il est rare de trouver des donn\u00e9es pures sur l'action du visage. Lorsque les participants effectuent des expressions impures, c'est soit parce qu'ils affichent la mauvaise action faciale, soit parce qu'ils sont incapables d'isoler l'expression cible sans utiliser des muscles faciaux suppl\u00e9mentaires non cibl\u00e9s.<\/li><li>Pour couronner le tout, les responsables de l'acquisition des donn\u00e9es sont souvent incapables de dire si le participant atteint l'expression cible. Ce manque de connaissances n'est pas imputable aux sp\u00e9cialistes de l'acquisition de donn\u00e9es, mais plut\u00f4t aux priorit\u00e9s mal plac\u00e9es de l'entreprise X et \u00e0 son manque d'attention \u00e0 l'embauche et \u00e0 la conservation des bons talents.<\/li><\/ul><p><strong>Mauvais \u00e9tiquetage des donn\u00e9es<\/strong><\/p><ul><li>En raison de l'accent mis sur les talents d'ing\u00e9nierie, les entreprises n\u00e9gligent g\u00e9n\u00e9ralement de donner la priorit\u00e9 aux r\u00f4les d'\u00e9tiquetage des donn\u00e9es. Au lieu de cela, les efforts d'annotation sont souvent trait\u00e9s comme des postes de bas niveau destin\u00e9s \u00e0 des contractants sans expertise particuli\u00e8re.<\/li><li>Les contractants qui d\u00e9butent avec peu d'exp\u00e9rience peuvent finir par se familiariser suffisamment avec les donn\u00e9es pour acqu\u00e9rir une expertise ; toutefois, cela se produit rarement, car les postes de labellisation contractuelle connaissent g\u00e9n\u00e9ralement un taux de rotation \u00e9lev\u00e9.<\/li><\/ul><p><strong>Choix artistiques non \u00e9clair\u00e9s<\/strong><\/p><ul><li>Il est important que l'art comprenne la technologie et que la technologie comprenne l'art. Il y a une d\u00e9connexion stup\u00e9fiante entre l'art et l'ing\u00e9nierie au sein des entreprises technologiques. Dans de nombreux cas, les bons traqueurs ne le sont pas en raison des traqueurs eux-m\u00eames, mais en raison des choix artistiques faits pour lutter contre une technologie immature en coulisses. Davantage de ressources devraient \u00eatre investies pour combler le foss\u00e9 entre l'art et l'ing\u00e9nierie.<\/li><\/ul><h2>Retour \u00e0 Memoji et \u00e0 l'abaissement des sourcils en cas de faux positif<\/h2><p>Comme indiqu\u00e9 au d\u00e9but de cet article, chaque fois que Memoji tente de refl\u00e9ter mon sourire, il y a un ajout inutile d'abaissement des sourcils aux coins int\u00e9rieurs de mon front. Encore une fois, cet ajout persiste dans diff\u00e9rents types de sourires.<\/p><p>Le graphique ci-dessous est un exemple de la mani\u00e8re dont l'interaction entre la qualit\u00e9 des donn\u00e9es et l'art peut affecter diverses expressions de mani\u00e8re n\u00e9gative et entra\u00eener des probl\u00e8mes tels que l'abaissement des sourcils lors des sourires.<\/p><p><span style=\"text-decoration: underline;\">NOTE<\/span>: Il peut bien s\u00fbr y avoir de multiples causes potentielles, y compris des probl\u00e8mes avec l'algorithme lui-m\u00eame ; cependant, cet aper\u00e7u est fait pour mettre en \u00e9vidence un sc\u00e9nario sp\u00e9cifique avec un ensemble sp\u00e9cifique de conditions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2209aca elementor-widget elementor-widget-image\" data-id=\"2209aca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"900\" height=\"527\" src=\"https:\/\/i0.wp.com\/melindaozel.com\/wp-content\/uploads\/2025\/03\/face-tracking-avatars-FACS-issues.webp?fit=900%2C527&amp;ssl=1\" class=\"attachment-large size-large wp-image-12234\" alt=\"diagramme des questions relatives au suivi des visages et aux avatars utilisant les formes FACS\" srcset=\"https:\/\/i0.wp.com\/melindaozel.com\/wp-content\/uploads\/2025\/03\/face-tracking-avatars-FACS-issues.webp?w=900&amp;ssl=1 900w, https:\/\/i0.wp.com\/melindaozel.com\/wp-content\/uploads\/2025\/03\/face-tracking-avatars-FACS-issues.webp?resize=300%2C176&amp;ssl=1 300w, https:\/\/i0.wp.com\/melindaozel.com\/wp-content\/uploads\/2025\/03\/face-tracking-avatars-FACS-issues.webp?resize=768%2C450&amp;ssl=1 768w, https:\/\/i0.wp.com\/melindaozel.com\/wp-content\/uploads\/2025\/03\/face-tracking-avatars-FACS-issues.webp?resize=18%2C12&amp;ssl=1 18w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-615d487 elementor-widget elementor-widget-text-editor\" data-id=\"615d487\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>La d\u00e9composition<\/h2><p><em>Plissement du nez et \u00e9l\u00e9vation de la l\u00e8vre sup\u00e9rieure<\/em> sont deux actions faciales qui se ressemblent.<\/p><ul><li>Elles sont souvent confondues entre elles, tant au niveau de la collecte des donn\u00e9es qu'au niveau de l'\u00e9tiquetage des donn\u00e9es.<\/li><li>Parce que les entreprises technologiques n'investissent pas suffisamment dans la qualit\u00e9 des donn\u00e9es, elles ne forment g\u00e9n\u00e9ralement pas d'employ\u00e9s capables d'identifier avec pr\u00e9cision ou d'expliquer comment diff\u00e9rencier les donn\u00e9es. <em>rideau de nez<\/em> et <em>l\u00e8vre sup\u00e9rieure<\/em>.<\/li><li>Les erreurs dans la collecte et l'\u00e9tiquetage des donn\u00e9es passent inaper\u00e7ues, et le talent est incapable de d\u00e9tecter les erreurs de suivi.<\/li><\/ul><p>Une technique courante dans l'art consiste \u00e0 utiliser <em>l\u00e8vre sup\u00e9rieure<\/em> comme compl\u00e9ment de forme combo pour les sourires.<\/p><ul><li>Parce que l'action de l'extracteur de coin de l\u00e8vres soul\u00e8ve la l\u00e8vre sup\u00e9rieure lorsqu'un sourire est intense, beaucoup supposent que ce mouvement est synonyme de <em>l\u00e8vre sup\u00e9rieure.\u00a0<\/em>Ce n'est pas aussi simple.<\/li><li>De nombreux artistes utilisent le <em>l\u00e8vre sup\u00e9rieure\u00a0<\/em>forme \u00e0 combiner avec\u00a0<em>extracteur de coin de l\u00e8vre <\/em>pour cr\u00e9er un sourire fort. <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/melindaozel.com\/building-smiles-the-right-way\/\" target=\"_blank\" rel=\"noopener noreferrer\">Plus de d\u00e9tails ici.<\/a><\/span><\/li><li>Outre les questions d'esth\u00e9tique et de pr\u00e9cision, un probl\u00e8me flagrant subsiste : Si les <em>l\u00e8vre sup\u00e9rieure<\/em> est li\u00e9e \u00e0 <em>le nez se plisse,<\/em> lorsqu'un sourire fort est initi\u00e9, il activera <em>l\u00e8vre sup\u00e9rieure,<\/em> qui activera alors <em>rideau de nez<\/em>. Par cons\u00e9quent, lorsque quelqu'un sourit, ses sourcils s'abaissent. Mauvais.<\/li><\/ul><p>La qualit\u00e9 des donn\u00e9es ne fait pas l'objet d'une attention suffisante.<br \/>On n'accorde pas assez de cr\u00e9dit \u00e0 l'art.<\/p><h2>R\u00e9soudre le probl\u00e8me<\/h2><p>La solution la plus simple ? <a href=\"https:\/\/melindaozel.com\/reasons-the-facs-manual-is-not-for-you\/\" target=\"_blank\" rel=\"noopener\"><b>S'\u00e9loigner de la FACS et s'appuyer sur l'anatomie faciale.<\/b><\/a> La solution la plus simple pour r\u00e9duire le nombre de faux positifs consiste \u00e0 abaisser le niveau de l'eau par l'interm\u00e9diaire de<em> rideau de nez<\/em> et <em>l\u00e8vre sup\u00e9rieure<\/em> est d'honorer les propri\u00e9t\u00e9s des muscles \u00e0 l'origine de ces actions.<\/p><p>D'un point de vue anatomique, ni le levator palpebrae superioris (<em>l\u00e8vre sup\u00e9rieure<\/em> ) ni le levator palpebrae superioris alaeque nasi (<em>rideau de nez<\/em> ) abaisse les sourcils. Ce n'est que dans les limites des r\u00e8gles de codage facial du FACS que l'abaissement des sourcils est li\u00e9 au plissement du nez.\u00a0<\/p><p>Vous pouvez vous \u00e9pargner des maux de t\u00eate en vous contentant de.. :<\/p><ol><li><strong>revoir vos r\u00e8gles d'\u00e9tiquetage afin de classer l'abaissement du front comme une action distincte de l'abaissement de la t\u00eate. <em>rideau de nez<\/em><\/strong><\/li><li><strong>redessinez vos blendshapes pour accueillir un <em>rideau de nez<\/em> sans baisser les sourcils de mani\u00e8re inh\u00e9rente<\/strong><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Pourquoi les traceurs de visage et les avatars souffrent-ils d'un abaissement des sourcils faussement positif ? Nous explorons ici la cause premi\u00e8re et proposons une solution \u00e9tonnamment simple.<\/p>","protected":false},"author":60486633,"featured_media":2680,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[676756913,676756994,676756915,676757008,676756993],"tags":[676757222,676757219],"class_list":["post-2678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-action-units","category-ar-vr","category-facial-expressions","category-free","category-tech","tag-face-tracking","tag-facial-action-coding-system-facs","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ARKit &amp; Other Face Tracking Mistakes - Face the FACS | Facial Expressions in Animation, AI, &amp; Behavior<\/title>\n<meta name=\"description\" content=\"Why do face trackers and avatars suffer from false positive brow lowering? 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