{"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\/fi\/arkit-other-face-tracking-mistakes\/","title":{"rendered":"ARKit &amp; muut kasvojen seurantavirheet"},"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>Miksi niin monet kasvojenseurantalaitteet ja avatarit k\u00e4rsiv\u00e4t v\u00e4\u00e4rist\u00e4 positiivisista otsanlaskuista? T\u00e4ss\u00e4 jaottelussa selvitet\u00e4\u00e4n Applen ARKitin avulla ongelman juurisyyt\u00e4 ja paljastetaan lopuksi yll\u00e4tt\u00e4v\u00e4n yksinkertainen ratkaisu.\u00a0<\/em><\/p><h2>Avatarit ja hymyt: Memoji Edition<\/h2><p>V\u00e4\u00e4r\u00e4n positiivinen kulmien lasku on yleinen ongelma kasvojen seurannassa ja avatar-animaatiossa. Vaikka n\u00e4m\u00e4 virheet ovatkin hienovaraisia, ne voivat v\u00e4\u00e4rist\u00e4\u00e4 avatarin ilmeit\u00e4 ja antaa tahattomia vihjeit\u00e4 surusta, vihasta tai huolesta. Alla olevalla videolla testaan Applen Memojia stressitesti\u00e4, jossa havainnollistan t\u00e4t\u00e4 ongelmaa k\u00e4yt\u00e4nn\u00f6ss\u00e4.<\/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=fi&#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>Yll\u00e4 olevassa klipiss\u00e4 n\u00e4et, kuinka Memoji \"peilaa\" hymy\u00e4ni. Huomaatko mit\u00e4\u00e4n outoa tai ep\u00e4miellytt\u00e4v\u00e4\u00e4? Kulmakarvojeni sis\u00e4kulmat ovat virheellisesti alhaalla. V\u00e4\u00e4rin kohdistettu kulmakarvojen laskeminen esiintyy edelleen erilaisissa hymytyypeiss\u00e4. Se esiintyy my\u00f6s muilla k\u00e4ytt\u00e4jill\u00e4.<\/p><p>Alentuneet sis\u00e4kulmakarvat yhdistettyn\u00e4 kohonneeseen yl\u00e4huuleen (johtuen <em>nen\u00e4 ryppyinen <\/em>tai <em>huulen kohottaja<\/em>) liittyy usein ep\u00e4miellytt\u00e4viin tunteisiin. Alaslasketut kulmak\u00e4rjet korreloivat my\u00f6s negatiivisesti hymyilyn kanssa. T\u00e4m\u00e4ntyyppiset semanttisesti merkitt\u00e4v\u00e4t seurantavirheet voivat tahattomasti vihjata negatiiviseen tunnetilaan.<\/p><h2>Miten n\u00e4m\u00e4 virheet syntyv\u00e4t<\/h2><p>V\u00e4\u00e4r\u00e4n positiivisen otsalohkon laskeminen johtuu usein tietojen laatuun liittyvist\u00e4 ongelmista, merkint\u00e4virheist\u00e4 ja taiteellisista valinnoista. Seuraavassa kerrotaan, miksi n\u00e4m\u00e4 ongelmat jatkuvat:<\/p><ol><li>Tietojen laatuun ei kiinnitet\u00e4 riitt\u00e4v\u00e4sti huomiota.<\/li><li>Taiteeseen ei keskityt\u00e4 tarpeeksi.<\/li><\/ol><p>Kaikkialla, miss\u00e4 olen ty\u00f6skennellyt, on ollut niin paljon huolta tietyn taustan omaavien insin\u00f6\u00f6rien palkkaamisesta, ett\u00e4 <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\">henkil\u00f6st\u00f6m\u00e4\u00e4r\u00e4\u00e4 vied\u00e4\u00e4n muilta keskeisilt\u00e4 teht\u00e4vilt\u00e4.<\/a><\/span><\/p><p>Monet teknologiajohtajat olettavat, ett\u00e4 jos he hankkivat riitt\u00e4v\u00e4sti dataa mallinsa kouluttamiseksi, laatuongelmat korjaantuvat itsest\u00e4\u00e4n. Vau! Taika. T\u00e4m\u00e4 oletus perustuu usein siihen (mutta v\u00e4\u00e4r\u00e4\u00e4n) uskomukseen, ett\u00e4 ep\u00e4puhtaita tietoja on vain h\u00e4vi\u00e4v\u00e4n pieni prosenttiosuus.<\/p><p>Olen ollut syv\u00e4ll\u00e4 datan parissa ja ty\u00f6skennellyt l\u00e4hes kaikissa kasvojenseurannan muissa kuin insin\u00f6\u00f6rin teht\u00e4viss\u00e4:<\/p><ul><li><strong>tietojen suunnittelu<\/strong> - sen m\u00e4\u00e4ritt\u00e4minen, mink\u00e4 tyyppisi\u00e4 ilmaisutietoja ker\u00e4t\u00e4\u00e4n ja miten ne ker\u00e4t\u00e4\u00e4n.<\/li><li><strong>tiedonkeruu<\/strong> - ty\u00f6skentely osallistujien kanssa ja heid\u00e4n kouluttamisensa oikeisiin ilmeasentoihin.<\/li><li><strong>data-annotaatio<\/strong> - parhaiden tapojen m\u00e4\u00e4ritt\u00e4minen maamerkkien merkitsemiseksi<\/li><li><strong>tietojen luokittelu<\/strong> - neuvoa suunnittelua siit\u00e4, mit\u00e4 luokkia pit\u00e4isi olla olemassa, mitk\u00e4 ovat niiden parametrit ja miten k\u00e4sitell\u00e4 niiden v\u00e4ist\u00e4m\u00e4tt\u00f6mi\u00e4 \u00e4\u00e4ritapauksia.<\/li><li><strong>skaalautuminen<\/strong> - varmistamalla, ett\u00e4 merkint\u00e4- ja luokittelus\u00e4\u00e4nn\u00f6t ovat standardoituja ja helposti ymm\u00e4rrett\u00e4vi\u00e4 massamittaisten merkint\u00f6jen tekij\u00f6ille<\/li><li><strong>seuranta seuranta<\/strong> - vertaamalla pohjatotuutta seurannan tuloksiin<\/li><li><strong>parannettavien alojen tunnistaminen<\/strong> - selvitet\u00e4\u00e4n, mit\u00e4 ongelmia on olemassa ja miten niit\u00e4 voidaan parantaa suunnittelun, keruun, merkint\u00f6jen ja\/tai luokittelun avulla.<\/li><li><strong>avatarin kehitt\u00e4minen<\/strong> - strateginen valinta, mitk\u00e4 muodot asetetaan etusijalle sellaisten n\u00e4k\u00f6kohtien perusteella, kuten -<ul><li>miss\u00e4 seurantalaite ep\u00e4onnistuu<\/li><li>mitk\u00e4 ovat lopputuotteen k\u00e4ytt\u00f6tapaukset<\/li><li>mik\u00e4 on esteettisesti miellytt\u00e4vint\u00e4.<\/li><li>mik\u00e4 on semanttisesti t\u00e4rkeint\u00e4<\/li><\/ul><\/li><\/ul><p>Koska minulla on taustaa ilmaisututkimuksesta, kasvojen anatomiasta ja laajasta ty\u00f6st\u00e4 kasvodatan parissa, voin varmuudella sanoa, ett\u00e4 ep\u00e4puhtaat tiedot ovat kasvojen seurannassa merkitt\u00e4v\u00e4 ongelma, eiv\u00e4t mik\u00e4\u00e4n v\u00e4h\u00e4p\u00e4t\u00f6inen ongelma. Lyhyesti sanottuna, vaikka algoritmi olisi t\u00e4ydellinen, ongelmia syntyy seuraavista syist\u00e4:<\/p><p><strong>Ep\u00e4puhtaat positiiviset tiedot<\/strong><\/p><ul><li>Kun ihmisilt\u00e4 ker\u00e4t\u00e4\u00e4n ekspressiotietoja, tiedot ovat aina ep\u00e4puhtaita. Taattu.<\/li><li>Useimmat ihmiset eiv\u00e4t voi osua jokaiseen tavoiteilmaisuun. On harvinaista l\u00f6yt\u00e4\u00e4 puhdasta kasvojen toimintatietoa. Kun osallistujat esitt\u00e4v\u00e4t ep\u00e4puhtaita ilmeit\u00e4, se johtuu siit\u00e4, ett\u00e4 he joko esitt\u00e4v\u00e4t v\u00e4\u00e4r\u00e4n kasvotoiminnon tai siit\u00e4, ett\u00e4 he eiv\u00e4t pysty erist\u00e4m\u00e4\u00e4n kohdeilmaisua k\u00e4ytt\u00e4m\u00e4tt\u00e4 muita, ei-kohteena olevia kasvolihaksia.<\/li><li>Kaiken kukkuraksi tiedonhankkijat eiv\u00e4t useinkaan osaa sanoa, osuuko osallistuja edes tavoiteilmaisuun. T\u00e4m\u00e4 tiedon puute ei ole tiedonhankkijoiden vika, vaan pikemminkin yritys X:n v\u00e4\u00e4r\u00e4nlaisten prioriteettien ja oikeiden osaajien palkkaamiseen tai pit\u00e4miseen kohdistuvan huomion puutteen syyt\u00e4.<\/li><\/ul><p><strong>Huono tietojen merkint\u00e4<\/strong><\/p><ul><li>Koska yritykset keskittyv\u00e4t liikaa insin\u00f6\u00f6ritaitoihin, ne tyypillisesti laiminly\u00f6v\u00e4t tietojen merkitsemisroolien priorisoinnin. Sen sijaan merkint\u00e4pyrkimyksi\u00e4 k\u00e4sitell\u00e4\u00e4n usein matalan tason teht\u00e4vin\u00e4, jotka on tarkoitettu urakoitsijoille, joilla ei ole erityist\u00e4 asiantuntemusta.<\/li><li>Aloittavat urakoitsijat, joilla on vain v\u00e4h\u00e4n kokemusta, voivat lopulta perehty\u00e4 tietoihin niin hyvin, ett\u00e4 he saavat asiantuntemusta; n\u00e4in tapahtuu kuitenkin harvoin, koska sopimusmerkint\u00e4teht\u00e4viss\u00e4 on yleens\u00e4 suuri vaihtuvuus.<\/li><\/ul><p><strong>Tiet\u00e4m\u00e4tt\u00f6m\u00e4t taidevalinnat<\/strong><\/p><ul><li>On t\u00e4rke\u00e4\u00e4, ett\u00e4 taide ymm\u00e4rt\u00e4\u00e4 tekniikkaa ja tekniikka ymm\u00e4rt\u00e4\u00e4 taidetta. Teknologiayrityksiss\u00e4 taiteen ja tekniikan v\u00e4lill\u00e4 on h\u00e4mm\u00e4stytt\u00e4v\u00e4n suuri ep\u00e4suhta. Monissa tapauksissa hyv\u00e4t seurantalaitteet eiv\u00e4t n\u00e4yt\u00e4 hyv\u00e4lt\u00e4 itse seurantalaitteiden takia, vaan niiden taiteellisten valintojen takia, jotka on tehty ep\u00e4kyps\u00e4n tekniikan torjumiseksi kulissien takana. Taiteen ja tekniikan v\u00e4lisen kuilun umpeen kuromiseen pit\u00e4isi panostaa enemm\u00e4n resursseja.<\/li><\/ul><h2>Takaisin kohteeseen Memoji &amp; v\u00e4\u00e4r\u00e4 positiivinen kulmien laskeminen<\/h2><p>Kuten t\u00e4m\u00e4n postauksen alussa mainittiin, aina kun Memoji yritt\u00e4\u00e4 peilata hymy\u00e4ni, kulmakarvojeni sis\u00e4nurkissa on tarpeetonta kulmien laskemista. T\u00e4m\u00e4 lis\u00e4ys jatkuu edelleen eri tyyppisiss\u00e4 hymyiss\u00e4.<\/p><p>Alla oleva kaavio on esimerkki siit\u00e4, miten tietojen laadun ja taiteen v\u00e4linen vuorovaikutus voi vaikuttaa erilaisiin ilmaisuihin negatiivisesti ja aiheuttaa ongelmia, kuten kulmien laskeutumisen hymyill\u00e4.<\/p><p><span style=\"text-decoration: underline;\">HUOMAUTUS<\/span>: Mahdollisia syit\u00e4 voi tietysti olla useita, mukaan lukien algoritmiin itseens\u00e4 liittyv\u00e4t ongelmat; t\u00e4m\u00e4 hahmotelma on kuitenkin tehty korostamaan tietty\u00e4 skenaariota, johon liittyy tietty joukko ehtoja.<\/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=\"kaavio kasvojen seurantaan ja avatareihin liittyvist\u00e4 kysymyksist\u00e4 FACS-muotojen avulla.\" 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>Sen hajottaminen<\/h2><p><em>Nen\u00e4n ryppyj\u00e4 ja yl\u00e4huulen kohottaja<\/em> ovat kaksi samann\u00e4k\u00f6ist\u00e4 kasvojen toimintaa.<\/p><ul><li>Ne sekoitetaan usein toisiinsa sek\u00e4 tiedonkeruun ett\u00e4 tietojen merkitsemisen tasolla.<\/li><li>Koska teknologiayritykset eiv\u00e4t investoi kunnolla tietojen laatuun, ne eiv\u00e4t yleens\u00e4 kasvata ty\u00f6ntekij\u00f6it\u00e4, jotka osaavat tunnistaa tai selitt\u00e4\u00e4, miten erottaa toisistaan <em>nen\u00e4 ryppyinen<\/em> ja <em>huulen kohottaja<\/em>.<\/li><li>Virheet sek\u00e4 tiedonkeruussa ett\u00e4 tietojen merkitsemisess\u00e4 j\u00e4\u00e4v\u00e4t huomaamatta, eik\u00e4 lahjakkuus pysty havaitsemaan seurantavirheit\u00e4.<\/li><\/ul><p>Yleinen tekniikka taiteessa on k\u00e4ytt\u00e4\u00e4 <em>huulen kohottaja<\/em> yhdistelm\u00e4muotoisena lis\u00e4osana hymyille.<\/p><ul><li>Koska huulten kulmanvet\u00e4j\u00e4n toiminta nostaa yl\u00e4huulta, kun hymy on voimakas, monet olettavat, ett\u00e4 t\u00e4m\u00e4 liike on synonyymi <em>yl\u00e4huulen kohottaja.\u00a0<\/em>Asia ei ole aivan n\u00e4in yksinkertainen.<\/li><li>Monet taiteilijat k\u00e4ytt\u00e4v\u00e4t <em>huulen kohottaja\u00a0<\/em>muoto yhdistett\u00e4v\u00e4ksi\u00a0<em>huulten kulmavetolaite <\/em>luoda vahva hymy. <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/melindaozel.com\/building-smiles-the-right-way\/\" target=\"_blank\" rel=\"noopener noreferrer\">Lis\u00e4tietoja t\u00e4\u00e4ll\u00e4.<\/a><\/span><\/li><li>Esteettiset ja tarkkuuteen liittyv\u00e4t kysymykset syrj\u00e4\u00e4n, mutta yksi ongelma on edelleen r\u00e4ike\u00e4: Jos <em>huulen kohottaja<\/em> on sidottu <em>nen\u00e4 rypistyy,<\/em> kun voimakas hymy k\u00e4ynnistyy, se aktivoi <em>yl\u00e4huulen kohottaja,<\/em> joka sitten aktivoi <em>nen\u00e4 ryppyinen<\/em>. Siksi kun joku hymyilee, h\u00e4nen kulmakarvansa laskevat. Huono.<\/li><\/ul><p>Tietojen laatuun ei kiinnitet\u00e4 riitt\u00e4v\u00e4sti huomiota.<br \/>Taiteelle ei anneta tarpeeksi tunnustusta.<\/p><h2>Ongelman korjaaminen<\/h2><p>Yksinkertaisin ratkaisu? <a href=\"https:\/\/melindaozel.com\/reasons-the-facs-manual-is-not-for-you\/\" target=\"_blank\" rel=\"noopener\"><b>Siirry pois FACS:st\u00e4 ja nojaa kasvojen anatomiaan.<\/b><\/a> Helpoin ratkaisu v\u00e4hent\u00e4\u00e4 v\u00e4\u00e4ri\u00e4 positiivisia selk\u00e4saunoja alentamalla kautta<em> nen\u00e4 ryppyinen<\/em> ja <em>huulen kohottaja<\/em> on kunnioittaa n\u00e4iden toimien taustalla olevien lihasten ominaisuuksia.<\/p><p>Anatomisesta n\u00e4k\u00f6kulmasta kumpikaan levator palpebrae superioris (<em>huulen kohottaja<\/em> lihas) eik\u00e4 levator palpebrae superioris alaeque nasi (<em>nen\u00e4 ryppyinen<\/em> lihas) laskee kulmakarvoja. Vain FACS:n kasvojen koodauss\u00e4\u00e4nt\u00f6jen puitteissa kulmakarvojen laskeminen liittyy nen\u00e4n rypistymiseen.\u00a0<\/p><p>Voit s\u00e4\u00e4st\u00e4\u00e4 itsesi p\u00e4\u00e4ns\u00e4rylt\u00e4, jos yksinkertaisesti:<\/p><ol><li><strong>Suunnittele merkint\u00e4s\u00e4\u00e4nt\u00f6j\u00e4si uudelleen siten, ett\u00e4 otsanlaskija luokitellaan erilliseksi toiminnoksi kuin otsanlaskija. <em>nen\u00e4 ryppyinen<\/em><\/strong><\/li><li><strong>suunnitella uudelleen blendshapeja is\u00e4nn\u00f6id\u00e4ksesi <em>nen\u00e4 ryppyinen<\/em> ilman luontaista kulmien laskemista<\/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>Miksi kasvojenseurantalaitteet ja avatarit k\u00e4rsiv\u00e4t v\u00e4\u00e4r\u00e4st\u00e4 positiivisesta kulmien laskusta? T\u00e4ss\u00e4 tutkimme perimm\u00e4ist\u00e4 syyt\u00e4 ja tarjoamme yll\u00e4tt\u00e4v\u00e4n yksinkertaisen ratkaisun.<\/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 v27.3 (Yoast SEO v27.3) - 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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