{"id":3709,"date":"2017-06-20T05:33:32","date_gmt":"2017-06-20T12:33:32","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=3709"},"modified":"2025-06-13T20:40:54","modified_gmt":"2025-06-14T03:40:54","slug":"build-photogallery-app-auto-tagging-using-aws-rekognition-couchbase-3","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/build-photogallery-app-auto-tagging-using-aws-rekognition-couchbase-3\/","title":{"rendered":"Criar um aplicativo de galeria de fotos com marca\u00e7\u00e3o autom\u00e1tica usando o AWS Rekognition e o Couchbase - Parte 3"},"content":{"rendered":"<p><em><a href=\"https:\/\/www.linkedin.com\/in\/ratnopam-chakrabarti\" target=\"_blank\" rel=\"noopener noreferrer\">Ratnopam Chakrabarti<\/a>\u00a0\u00e9 um desenvolvedor de software que trabalha atualmente para a Ericsson Inc. Ele tem se concentrado em IoT, tecnologias m\u00e1quina a m\u00e1quina, carros conectados e dom\u00ednios de cidades inteligentes por um bom tempo. Ele adora aprender novas tecnologias e coloc\u00e1-las em pr\u00e1tica. Quando n\u00e3o est\u00e1 trabalhando, gosta de passar o tempo com seu filho de 3 anos.<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2542\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2017\/02\/ratnopamchakrabarti2.jpeg\" alt=\"Ratnopam Chakrabarti\" width=\"150\" height=\"200\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/02\/ratnopamchakrabarti2.jpeg 150w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/02\/ratnopamchakrabarti2-15x20.jpeg 15w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/p>\n<h3>Impressionante AWS (Amazon Web Services)<\/h3>\n<p>Em <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/build-photogallery-app-aws-rekognition-couchbase\/\">Partes 1<\/a> e <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/build-photogallery-app-aws-rekognition-and-couchbase-part2\/\">Parte 2<\/a> da s\u00e9rie, falei principalmente sobre o Couchbase. Nesta parte, vou me concentrar no AWS e, mais especificamente, na API AWS Reckognition.<\/p>\n<h3>Criar um bucket S3<\/h3>\n<p>Como pr\u00e9-requisito para executar o aplicativo photogallery, voc\u00ea precisa criar um bucket s3 usando sua conta do Amazon Web Services. Voc\u00ea pode usar a op\u00e7\u00e3o <u><a href=\"https:\/\/github.com\/ratchakr\/ImageTagger\/blob\/staging\/CloudFormation_s3_bucket.json\" target=\"_blank\" rel=\"noopener noreferrer\">modelo de cloudformation<\/a><\/u>\u00a0Mencionei na Parte 1 da s\u00e9rie para cri\u00e1-lo automaticamente; caso contr\u00e1rio, voc\u00ea sempre poder\u00e1 cri\u00e1-lo manualmente usando o Console da AWS.<\/p>\n<h3>Pol\u00edtica de balde<\/h3>\n<p>Tanto o Couchbase quanto o S3 usam o conceito de \"bucket\" para armazenar dados. Tentarei mencionar o contexto adequado ao me referir ao termo \"bucket\" - se \u00e9 um bucket do Couchbase ou um bucket do S3. Tente n\u00e3o se confundir entre os dois, embora o objetivo subjacente de um \"bucket\" seja armazenar dados no Couchbase e no S3.<\/p>\n<p>Aqui, estou me referindo a um bucket S3.<\/p>\n<p>Para permitir que os usu\u00e1rios armazenem imagens em um bucket s3, precisamos criar uma pol\u00edtica de bucket. Por padr\u00e3o, o acesso a um bucket s3 \u00e9 privado. Para substituir a pol\u00edtica padr\u00e3o, criamos a seguinte pol\u00edtica que permite que todos os usu\u00e1rios armazenem objetos no s3 e busquem objetos do s3.<\/p>\n<pre class=\"lang:default decode:true\">{\r\n\r\n\u00a0 \u00a0 \"Version\": \"2012-10-17\",\r\n\r\n\u00a0 \u00a0 \"Id\": \"Policy1493677249191\",\r\n\r\n\u00a0 \u00a0 \"Statement\": [\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 {\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"Sid\": \"Stmt1493677246291\",\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"Effect\": \"Allow\",\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"Principal\": \"*\",\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"Action\": \"s3:GetObject\",\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"Resource\": \"arn:aws:s3:::la-image-tagger-chakrar27\/*\"\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n\r\n\u00a0 \u00a0 ]\r\n\r\n}<\/pre>\n<p>No meu caso, o nome do bucket criado \u00e9 <em>la-image-tagger-chakrar27.<\/em><\/p>\n<h3>An\u00e1lise de imagens usando reconhecimento de imagem<\/h3>\n<p>No final de 2016, a AWS lan\u00e7ou o Rekognition, um servi\u00e7o de processamento de imagens que pode analisar uma imagem e inferir informa\u00e7\u00f5es \u00fateis sobre ela. Para obter um estudo detalhado, consulte a documenta\u00e7\u00e3o do AWS Rekognition <u><a href=\"https:\/\/aws.amazon.com\/rekognition\/?sc_channel=PS&amp;sc_campaign=acquisition_US_group_3&amp;sc_publisher=google&amp;sc_medium=rekognition_b_group_3&amp;sc_content=aws_recognition_software_exact&amp;sc_detail=aws%20rekognition&amp;sc_category=rekognition&amp;sc_segment=194345255026&amp;sc_matchtype=e&amp;sc_country=us&amp;s_kwcid=AL!4422!3!194345255026!e!!g!!aws%20rekognition&amp;ef_id=WR0nXwAAAGocXyYY:20170519042001:s\" target=\"_blank\" rel=\"noopener noreferrer\">aqui<\/a><\/u>.<\/p>\n<p>No contexto do aplicativo de galeria de fotos, usei o <em>detectLabels() <\/em>API que o AWS Rekognition oferece. Ele retorna um par de valores-chave de r\u00f3tulos com pontua\u00e7\u00f5es de confian\u00e7a. O trecho de c\u00f3digo a seguir faz o truque:<\/p>\n<pre class=\"lang:default decode:true\">(function(filename, res) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var rekognition = new aws.Rekognition();\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var params = {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Image: {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0S3Object: {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Bucket: S3_BUCKET,\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Name: filename\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0},\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0MaxLabels: 5,\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0MinConfidence: 50\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0};\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0rekognition.detectLabels(params, function(err, data) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (err) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\"Error in REKO\" + err);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0else {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ successful response\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0data = JSON.stringify(data);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0})\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n<\/pre>\n<p>O c\u00f3digo acima chama a fun\u00e7\u00e3o <em>detectLabels<\/em>\u00a0API e retorna um conjunto de r\u00f3tulos com base na an\u00e1lise da imagem. Nesse caso, limitei o n\u00famero m\u00e1ximo de r\u00f3tulos a 5 e a porcentagem m\u00ednima de confian\u00e7a a 50%.<\/p>\n<p>Depois que os r\u00f3tulos s\u00e3o retornados, eles s\u00e3o analisados usando JSON e colocados em <em>etiquetas <\/em>array. Quando isso for feito, o <em>salvar() <\/em>\u00e9 chamada para armazenar o documento no bucket do Couchbase.<\/p>\n<p>O Rekognition oferece algumas APIs interessantes, como <em>detectFaces()<\/em>\u00a0e <em>compareFaces()<\/em>\u00a0que abrem um espectro totalmente novo de casos de uso; no entanto, por enquanto, eu me limitei ao simples <em>detectLabels()<\/em>\u00a0API para come\u00e7ar.<\/p>\n<h3>Executar o aplicativo<\/h3>\n<p>Para executar o aplicativo de n\u00f3 photogallery, voc\u00ea precisa ter a chave de acesso S3 e as chaves secretas dispon\u00edveis. Voc\u00ea pode usar o m\u00f3dulo \"dotenv\" do node para armazen\u00e1-las em um arquivo chamado .env em seu c\u00f3digo-fonte. Se fizer isso, voc\u00ea <strong>deve adicionar o arquivo .env ao .gitignore<\/strong><strong>:<\/strong><\/p>\n<pre class=\"lang:default decode:true\">node_modules\/\r\n\r\n*.env<\/pre>\n<p>Voc\u00ea n\u00e3o quer expor as chaves de acesso do AWS ao mundo, a menos que esteja em um clima extremamente filantr\u00f3pico. Eu, no entanto, prefiro passar esses valores como uma vari\u00e1vel de ambiente. Veja a seguir como executar o aplicativo node usando vari\u00e1veis de ambiente:<\/p>\n<pre class=\"lang:default decode:true\">env AWS_ACCESS_KEY=&lt;Your Access Key&gt; AWS_SECRET_KEY=&lt;Your Secret key&gt; S3_BUCKET=&lt;S3-bucket-name&gt; HOST=https:\/\/localhost:3000 COUCHBASE_HOST=127.0.0.1:8091 COUCHBASE_BUCKET=photogallery \u00a0node upload.js<\/pre>\n<p><a href=\"https:\/\/www.couchbase.com\/blog\/pt\/community\/community-writers-program\/\"><em>Esta postagem faz parte do Programa de Reda\u00e7\u00e3o da Comunidade Couchbase<\/em><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Ratnopam Chakrabarti\u00a0is a software developer currently working for Ericsson Inc. He has been focused on IoT, machine-to-machine technologies, connected cars, and smart city domains for quite a while. He loves learning new technologies and putting them to work. When he\u2019s [&hellip;]<\/p>","protected":false},"author":53,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1810,1816],"tags":[10124],"ppma_author":[9026],"class_list":["post-3709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-mobile","category-couchbase-server","tag-amazon-web-services-aws"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Build a photogallery app with auto tagging \u2013 Part 3<\/title>\n<meta name=\"description\" content=\"Part 1 and Part 2 is mostly about Couchbase. 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