{"id":9446,"date":"2024-01-24T09:26:57","date_gmt":"2024-01-24T09:26:57","guid":{"rendered":"https:\/\/dailyai.com\/?p=9446"},"modified":"2024-01-24T12:56:28","modified_gmt":"2024-01-24T12:56:28","slug":"google-unveils-lumiere-a-text-to-video-diffusion-model","status":"publish","type":"post","link":"https:\/\/dailyai.com\/pt\/2024\/01\/google-unveils-lumiere-a-text-to-video-diffusion-model\/","title":{"rendered":"A Google revela o Lumiere, um modelo de difus\u00e3o de texto para v\u00eddeo"},"content":{"rendered":"<p><strong>A Google Research apresentou o Lumiere, um modelo de difus\u00e3o de texto para v\u00eddeo que cria v\u00eddeos extraordinariamente realistas a partir de texto ou imagens.<\/strong><\/p>\n<p>As imagens fixas geradas por ferramentas como <a href=\"https:\/\/dailyai.com\/pt\/2023\/12\/midjourney-v6-released-with-big-improvements-and-image-text\/\">Meio da viagem<\/a> ou DALL-E s\u00e3o incr\u00edveis, mas o texto para v\u00eddeo (TTV) ficou compreensivelmente para tr\u00e1s e tem sido muito menos impressionante at\u00e9 agora.<\/p>\n<p>Os modelos de TTV, como os da Pika Labs ou da Stable Video Diffusion, evolu\u00edram muito nos \u00faltimos 12 meses, mas o realismo e a continuidade do movimento continuam a ser um pouco desajeitados.<\/p>\n<p>O Lumiere representa um grande salto na TTV devido a uma nova abordagem para gerar v\u00eddeo que \u00e9 espacial e temporalmente coerente. Por outras palavras, o objetivo \u00e9 que as cenas em cada fotograma permane\u00e7am visualmente coerentes e os movimentos sejam suaves.<\/p>\n<h2>O que \u00e9 que o Lumiere pode fazer?<\/h2>\n<p>O Lumiere tem uma gama de funcionalidades de gera\u00e7\u00e3o de v\u00eddeo, incluindo as seguintes:<\/p>\n<ul>\n<li><strong>Texto para v\u00eddeo<\/strong> - Introduza uma mensagem de texto e o Lumiere gera um clip de v\u00eddeo de 5 segundos composto por 80 fotogramas a 16 fotogramas por segundo.<\/li>\n<li><strong>Imagem para v\u00eddeo<\/strong> - O Lumiere utiliza uma imagem como est\u00edmulo e transforma-a num v\u00eddeo.<\/li>\n<li><strong>Gera\u00e7\u00e3o estilizada<\/strong> - Uma imagem pode ser utilizada como uma refer\u00eancia de estilo. O Lumiere utiliza um prompt de texto para gerar um v\u00eddeo no estilo da imagem de refer\u00eancia.<\/li>\n<li><strong>Estiliza\u00e7\u00e3o de v\u00eddeo<\/strong> - O Lumiere pode editar um v\u00eddeo de origem para corresponder a um pedido de texto estil\u00edstico.<\/li>\n<li><strong>Cinemagrafias<\/strong> - Seleccione uma regi\u00e3o numa imagem fixa e o Lumiere ir\u00e1 animar essa parte da imagem.<\/li>\n<li><strong>Pintura de v\u00eddeo<\/strong> - O Lumiere pode pegar numa cena de v\u00eddeo com m\u00e1scara e pint\u00e1-la para completar o v\u00eddeo. Tamb\u00e9m pode editar o v\u00eddeo de origem, removendo ou substituindo elementos na cena.<\/li>\n<\/ul>\n<p>O v\u00eddeo abaixo mostra alguns dos v\u00eddeos impressionantes que o Lumiere pode gerar.<\/p>\n<p><iframe loading=\"lazy\" title=\"Lumin\u00e1ria\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/wxLr02Dz2Sc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h2>Como \u00e9 que o Lumiere o faz?<\/h2>\n<p>Os modelos de TTV existentes adoptam uma conce\u00e7\u00e3o em cascata em que um modelo de base gera um subconjunto de fotogramas-chave e, em seguida, utilizam um modelo de super-resolu\u00e7\u00e3o temporal (TSR) para gerar dados para preencher as lacunas entre fotogramas.<\/p>\n<p>Esta abordagem \u00e9 eficiente em termos de mem\u00f3ria, mas a tentativa de preencher as lacunas entre um conjunto de fotogramas-chave subamostrados resulta num v\u00eddeo com inconsist\u00eancias temporais ou movimentos com falhas. Os fotogramas de baixa resolu\u00e7\u00e3o s\u00e3o ent\u00e3o aumentados utilizando um modelo de super-resolu\u00e7\u00e3o espacial (SSR) em janelas n\u00e3o sobrepostas.<\/p>\n<p>O Lumiere adopta uma abordagem diferente. Utiliza uma arquitetura Space-Time U-Net (STUNet) que aprende a reduzir a amostragem do sinal tanto no espa\u00e7o como no tempo e processa todos os fotogramas de uma s\u00f3 vez.<\/p>\n<p>Uma vez que n\u00e3o est\u00e1 apenas a passar um subconjunto de amostras de fotogramas-chave para um TSR, o Lumiere consegue um movimento globalmente coerente. Para obter o v\u00eddeo de alta resolu\u00e7\u00e3o, o Lumiere aplica um modelo SSR em janelas sobrepostas e utiliza o MultiDiffusion para combinar as previs\u00f5es num resultado coerente.<\/p>\n<p>O Google Research realizou um estudo de utilizadores que demonstrou que os utilizadores preferiam maioritariamente os v\u00eddeos Lumiere a outros modelos de TTV.<\/p>\n<figure id=\"attachment_9448\" aria-describedby=\"caption-attachment-9448\" style=\"width: 986px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9448 size-full\" src=\"https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models.png\" alt=\"\" width=\"986\" height=\"1080\" srcset=\"https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models.png 986w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-274x300.png 274w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-935x1024.png 935w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-768x841.png 768w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-370x405.png 370w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-800x876.png 800w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-740x811.png 740w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-20x22.png 20w, https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/Lumiere-compared-to-other-TTV-models-44x48.png 44w\" sizes=\"auto, (max-width: 986px) 100vw, 986px\" \/><figcaption id=\"caption-attachment-9448\" class=\"wp-caption-text\">Prefer\u00eancias dos utilizadores relativamente \u00e0 qualidade do texto para o v\u00eddeo, ao alinhamento do v\u00eddeo com o texto e \u00e0 qualidade da imagem para o v\u00eddeo. Fonte: Pesquisa do Google<\/figcaption><\/figure>\n<p>O resultado final pode ser apenas um clip de 5 segundos, mas o realismo, a coer\u00eancia visual e o movimento s\u00e3o melhores do que qualquer outra solu\u00e7\u00e3o atualmente dispon\u00edvel. Atualmente, a maioria das outras solu\u00e7\u00f5es de TTV apenas gera clips de 3 segundos.<\/p>\n<p>O Lumiere n\u00e3o lida com transi\u00e7\u00f5es de cenas ou cenas de v\u00eddeo multi-fotografia, mas a funcionalidade multi-cena mais longa est\u00e1 quase de certeza na calha.<\/p>\n<p>No <a href=\"https:\/\/arxiv.org\/pdf\/2401.12945.pdf\">Artigo de investiga\u00e7\u00e3o Lumiere<\/a>A Google referiu que \"existe um risco de utiliza\u00e7\u00e3o indevida para criar conte\u00fados falsos ou prejudiciais com a nossa tecnologia\".<\/p>\n<p>Esperemos que encontrem uma forma eficaz de colocar uma marca de \u00e1gua nos seus v\u00eddeos e evitar problemas de direitos de autor, para que possam lan\u00e7ar o Lumiere para que o possamos testar.<\/p>","protected":false},"excerpt":{"rendered":"<p>A Google Research revelou o Lumiere, um modelo de difus\u00e3o de texto para v\u00eddeo que cria v\u00eddeos extremamente realistas a partir de texto ou imagens. As imagens fixas geradas por ferramentas como Midjourney ou DALL-E s\u00e3o incr\u00edveis, mas o texto para v\u00eddeo (TTV) ficou compreensivelmente para tr\u00e1s e tem sido muito menos impressionante at\u00e9 \u00e0 data. Os modelos de TTV, como os da Pika Labs ou da Stable Video Diffusion, evolu\u00edram muito nos \u00faltimos 12 meses, mas o realismo e a continuidade do movimento continuam a ser um pouco desorganizados. O Lumiere representa um grande salto na TTV devido a uma nova abordagem para gerar v\u00eddeo que \u00e9 espacial e temporalmente coerente.<\/p>","protected":false},"author":6,"featured_media":9451,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[107,102],"class_list":["post-9446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product","tag-generative-ai","tag-google"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Google unveils Lumiere, a text-to-video diffusion model | DailyAI<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dailyai.com\/pt\/2024\/01\/google-unveils-lumiere-a-text-to-video-diffusion-model\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Google unveils Lumiere, a text-to-video diffusion model | DailyAI\" \/>\n<meta property=\"og:description\" content=\"Google Research unveiled Lumiere, a text-to-video diffusion model that creates remarkably realistic videos from text or image prompts. The still images generated by tools like Midjourney or DALL-E are incredible, but text-to-video (TTV) has understandably lagged behind and has been a lot less impressive so far. TTV models like those from Pika Labs or Stable Video Diffusion have come a long way in the last 12 months but the realism and continuity of motion are still a little clunky. Lumiere represents a big jump in TTV due to a novel approach to generating video that is spatially and temporally coherent.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dailyai.com\/pt\/2024\/01\/google-unveils-lumiere-a-text-to-video-diffusion-model\/\" \/>\n<meta property=\"og:site_name\" content=\"DailyAI\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-24T09:26:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-24T12:56:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dailyai.com\/wp-content\/uploads\/2024\/01\/video-planning.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"654\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Eugene van der Watt\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DailyAIOfficial\" \/>\n<meta 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