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[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[],[],null,["# Detect faces in an image\n\nDraw boxes around detected faces in an image.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Face detection tutorial](/vision/docs/face-tutorial)\n\nCode sample\n-----------\n\n### Java\n\n\nBefore trying this sample, follow the Java setup instructions in the\n[Vision quickstart using\nclient libraries](/vision/docs/quickstart-client-libraries).\n\n\nFor more information, see the\n[Vision Java API\nreference documentation](/java/docs/reference/google-cloud-vision/latest/overview).\n\n\nTo authenticate to Vision, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n /** Connects to the Vision API using Application Default Credentials. */\n public static Vision getVisionService() throws IOException, GeneralSecurityException {\n GoogleCredentials credential =\n GoogleCredentials.getApplicationDefault().createScoped(VisionScopes.all());\n JsonFactory jsonFactory = GsonFactory.getDefaultInstance();\n return new Vision.Builder(\n GoogleNetHttpTransport.newTrustedTransport(),\n jsonFactory,\n new HttpCredentialsAdapter(credential))\n .setApplicationName(APPLICATION_NAME)\n .build();\n }\n\n### Node.js\n\n\nBefore trying this sample, follow the Node.js setup instructions in the\n[Vision quickstart using\nclient libraries](/vision/docs/quickstart-client-libraries).\n\n\nFor more information, see the\n[Vision Node.js API\nreference documentation](https://googleapis.dev/nodejs/vision/latest).\n\n\nTo authenticate to Vision, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n // Creates a client\n const client = new vision.ImageAnnotatorClient();\n\n const fs = require('fs');\n\n### PHP\n\n\nBefore trying this sample, follow the PHP setup instructions in the\n[Vision quickstart using\nclient libraries](/vision/docs/quickstart-client-libraries).\n\n\nFor more information, see the\n[Vision PHP API\nreference documentation](/php/docs/reference/cloud-vision/latest).\n\n\nTo authenticate to Vision, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n $imageAnnotator = new ImageAnnotatorClient();\n\n### Python\n\n\nBefore trying this sample, follow the Python setup instructions in the\n[Vision quickstart using\nclient libraries](/vision/docs/quickstart-client-libraries).\n\n\nFor more information, see the\n[Vision Python API\nreference documentation](/python/docs/reference/vision/latest).\n\n\nTo authenticate to Vision, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n client = vision.ImageAnnotatorClient()\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=vision)."]]