Face detection tutorial | Cloud Vision API

Objectives. In this sample, you'll use the Google Vision API to detect faces in an image. To prove to yourself that the faces were detected correctly, ... WhyGoogle close DiscoverwhyleadingbusinesseschooseGoogleCloud Whetheryourbusinessisearlyinitsjourneyorwellonitswaytodigitaltransformation,GoogleCloudcanhelpyousolveyourtoughestchallenges. Learnmore Keybenefits Overview Topreasonsbusinesseschooseus. Multicloud Runyourappswhereveryouneedthem. Trustandsecurity Keepyourdatasecureandcompliant. Globalinfrastructure BuildonthesameinfrastructureasGoogle. Datacloud Unifydataacrossyourorganization. Opencloud Scalewithopen,flexibletechnology. Sustainability Runonthecleanestcloudintheindustry. Productivityandcollaboration ConnectyourteamswithAI-poweredapps. Resources Events BrowseupcomingGoogleCloudevents. Blog Readourlatestproductnewsandstories. Customerstories Explorecasestudiesandvideos. Analystreports Readwhatindustryanalystssayaboutus. 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Quickstarts AllQuickstarts SetuptheVisionAPI Usingclientlibraries Usingthecommandline UsingAPIexplorer Samples AllVisionAPIcodesamples Allcodesamplesforallproducts How-toGuides AllHow-toguides Beforeyoubegin Opticalcharacterrecognition(OCR) DetecttextinimagesDetecthandwritinginimagesDetecttextinfiles(PDF/TIFF) Detectcrophints Detectfaces Detectimageproperties Detectlabels Detectlandmarks Detectlogos Detectmultipleobjects Detectexplicitcontent(SafeSearch) DetectWebentitiesandpages Batchfeaturedetection Images Batchimageannotationoffline Files(PDF/TIFF/GIF) SmallbatchfileannotationonlineDetecttextinfiles(PDF/TIFF) UsingVisionwithSpringframework Base64encode Restrictedaccess Celebrityrecognition Tutorials Alltutorials Textdetection(OCR)tutorial Densedocumenttextdetectiontutorial Translatingandspeakingtextfromaphoto Labeldetectioninteractivetutorial(console) Facedetectiontutorial Webdetectiontutorial Crophintstutorial Sampleapplications Searchcommunitytutorials Securitylogging 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CloudStorage Filestore PersistentDisk CloudStorageforFirebase LocalSSD StorageTransferService GoogleWorkspaceEssentials Savemoneywithourtransparentapproachtopricing Requestaquote GoogleCloud Pricingoverview Pricelist Pricingcalculator GoogleCloudFreeProgram RelatedProducts GoogleWorkspace GoogleMapsPlatform ChromeEnterprise Apigee Looker Firebase GetstartedwithGoogleCloud Getstartedforfree Self-serviceResources Getstarted DeveloperCenter GoogleCloudcertification Experthelpandtraining Consulting TechnicalAccountManagement Training Partnersandthird-partytools GoogleCloudpartners Becomeapartner GoogleCloudMarketplace Home Docs CloudVisionAPI Documentation Guides Sendfeedback Facedetectiontutorial Objectives Inthissample,you'llusetheGoogleVisionAPItodetectfacesinan image.Toprovetoyourselfthatthefacesweredetectedcorrectly,you'llthen usethatdatatodrawaboxaroundeachface. ViewingCodeSamples:Mostofthecode samplesinthistutorialaretakenfromlargercodefileslocatedinGitHub. Youcanviewanddownloadthecompletefilefromwhichacodesampleistakenby clickingthe"ViewonGitHub"buttonprovidedaboveasample. Costs ThistutorialusesthefollowingbillablecomponentsofGoogleCloud: CloudVision Togenerateacostestimatebasedonyourprojectedusage, usethepricingcalculator. NewGoogleCloudusersmightbeeligibleforafreetrial. Beforeyoubegin SignintoyourGoogleCloudaccount.Ifyou'renewto GoogleCloud, createanaccounttoevaluatehowourproductsperformin real-worldscenarios.Newcustomersalsoget$300infreecreditsto run,test,anddeployworkloads. IntheGoogleCloudconsole,ontheprojectselectorpage, selectorcreateaGoogleCloudproject. Note:Ifyoudon'tplantokeepthe resourcesthatyoucreateinthisprocedure,createaprojectinsteadof selectinganexistingproject.Afteryoufinishthesesteps,youcan deletetheproject,removingallresourcesassociatedwiththeproject. Gotoprojectselector MakesurethatbillingisenabledforyourCloudproject.Learnhowto checkifbillingisenabledonaproject. EnabletheGoogleCloudVisionAPI. EnabletheAPI IntheGoogleCloudconsole,ontheprojectselectorpage, selectorcreateaGoogleCloudproject. Note:Ifyoudon'tplantokeepthe resourcesthatyoucreateinthisprocedure,createaprojectinsteadof selectinganexistingproject.Afteryoufinishthesesteps,youcan deletetheproject,removingallresourcesassociatedwiththeproject. Gotoprojectselector MakesurethatbillingisenabledforyourCloudproject.Learnhowto checkifbillingisenabledonaproject. EnabletheGoogleCloudVisionAPI. EnabletheAPI Setupyourenvironmentforusing ApplicationDefaultCredentials. Setuplanguage-specifictasksandtools: C# InstalltheGoogleClientLibrary InstallVisualStudio2012/2015. Java InstallJava. APIreference. Downloadandinstall theApacheMavenbuildsystem.Mavenwill ensurethattheGoogleAPIClientLibrary andtheVisionAPIclientlibrariesareinstalledwhentheprojectis built,becausewehaveincludedtheminthepom.xml. vision/face-detection/pom.xml ViewonGitHub com.google.apis google-api-services-vision v1-rev20220319-1.32.1 com.google.auth google-auth-library-oauth2-http 1.4.0 com.google.guava guava 31.0.1-jre com.google.http-client google-http-client-jackson2 1.41.7 ... Node.js InstalltheGoogleClientLibrary Installnode.js. APIreference. Installnpmand node-canvas.Thesamplecodeincludesa package.jsontoinstallalldependenciesusing thecommand:npminstall.Notethatnode-canvashasadditional dependenciesyoumayneedtoinstall-seethenode-canvasinstallation docformoreinformation. samples/package.json ViewonGitHub { "name":"nodejs-docs-samples-vision", "private":true, "license":"Apache-2.0", "author":"GoogleLLC", "engines":{ "node":">=10.17.0" }, "files":[ "*.js" ], "scripts":{ "test":"mochasystem-test--timeout600000" }, "dependencies":{ "@google-cloud/vision":"^2.4.2", "natural":"^5.0.0", "pureimage":"^0.3.0", "redis":"^4.0.0", "yargs":"^16.0.0" }, "devDependencies":{ "@google-cloud/storage":"^5.0.0", "chai":"^4.2.0", "mocha":"^8.0.0", "uuid":"^8.0.0" } } PHP InstalltheGoogleClientLibrary InstallPHPandComposer. APIreference. InstallandenableGDforPHP. Python InstalltheGoogleClientLibrary InstallPython. APIreference. Installpillow. Ruby InstalltheGoogleClientLibrary InstallRubyandBundler. APIreference. InstallImageMagick. Createtheserviceobject ToaccessGoogleAPIsusingtheofficialclientSDKs,youcreateaservice objectbasedontheAPI'sdiscoverydocument,whichdescribestheAPItothe SDK.You'llneedtofetchitfromtheVisionAPI'sdiscoveryservice,using yourcredentials: Java vision/face-detection/src/main/java/com/google/cloud/vision/samples/facedetect/FaceDetectApp.java ViewonGitHub importcom.google.api.client.googleapis.javanet.GoogleNetHttpTransport; importcom.google.api.client.json.JsonFactory; importcom.google.api.client.json.jackson2.JacksonFactory; importcom.google.api.services.vision.v1.Vision; importcom.google.api.services.vision.v1.VisionScopes; importcom.google.api.services.vision.v1.model.AnnotateImageRequest; importcom.google.api.services.vision.v1.model.AnnotateImageResponse; importcom.google.api.services.vision.v1.model.BatchAnnotateImagesRequest; importcom.google.api.services.vision.v1.model.BatchAnnotateImagesResponse; importcom.google.api.services.vision.v1.model.FaceAnnotation; importcom.google.api.services.vision.v1.model.Feature; importcom.google.api.services.vision.v1.model.Image; importcom.google.api.services.vision.v1.model.Vertex; importcom.google.auth.http.HttpCredentialsAdapter; importcom.google.auth.oauth2.GoogleCredentials; importcom.google.common.collect.ImmutableList; importjava.awt.BasicStroke; importjava.awt.Color; importjava.awt.Graphics2D; importjava.awt.Polygon; importjava.awt.image.BufferedImage; importjava.io.IOException; importjava.nio.file.Files; importjava.nio.file.Path; importjava.nio.file.Paths; importjava.security.GeneralSecurityException; importjava.util.List; importjavax.imageio.ImageIO; /**ConnectstotheVisionAPIusingApplicationDefaultCredentials.*/ publicstaticVisiongetVisionService()throwsIOException,GeneralSecurityException{ GoogleCredentialscredential= GoogleCredentials.getApplicationDefault().createScoped(VisionScopes.all()); JsonFactoryjsonFactory=JacksonFactory.getDefaultInstance(); returnnewVision.Builder( GoogleNetHttpTransport.newTrustedTransport(), jsonFactory, newHttpCredentialsAdapter(credential)) .setApplicationName(APPLICATION_NAME) .build(); } Node.js samples/faceDetection.js ViewonGitHub //Bydefault,theclientwillauthenticateusingtheserviceaccountfile //specifiedbytheGOOGLE_APPLICATION_CREDENTIALSenvironmentvariableanduse //theprojectspecifiedbytheGCLOUD_PROJECTenvironmentvariable.See //https://googlecloudplatform.github.io/gcloud-node/#/docs/google-cloud/latest/guides/authentication constvision=require('@google-cloud/vision'); //Createsaclient constclient=newvision.ImageAnnotatorClient(); constfs=require('fs'); Python samples/snippets/face_detection/faces.py ViewonGitHub fromgoogle.cloudimportvision fromPILimportImage,ImageDraw client=vision.ImageAnnotatorClient() Sendafacedetectionrequest ToconstructarequesttotheVisionAPI,firstconsulttheAPI documentation.Inthiscase,you'llbeaskingtheimagesresource toannotateyourimage.ArequesttothisAPItakestheformofanobjectwith arequestslist.Eachiteminthislistcontainstwobitsofinformation: Thebase64-encodedimagedata Alistoffeaturesyou'dlikeannotatedaboutthatimage. Forthisexample,you'llsimplyrequestFACE_DETECTIONannotationonone image,andreturntherelevantportionoftheresponse: Java vision/face-detection/src/main/java/com/google/cloud/vision/samples/facedetect/FaceDetectApp.java ViewonGitHub /**Getsupto{@codemaxResults}facesforanimagestoredat{@codepath}.*/ publicListdetectFaces(Pathpath,intmaxResults)throwsIOException{ byte[]data=Files.readAllBytes(path); AnnotateImageRequestrequest= newAnnotateImageRequest() .setImage(newImage().encodeContent(data)) .setFeatures( ImmutableList.of( newFeature().setType("FACE_DETECTION").setMaxResults(maxResults))); Vision.Images.Annotateannotate= vision .images() .annotate(newBatchAnnotateImagesRequest().setRequests(ImmutableList.of(request))); //Duetoabug:requeststoVisionAPIcontaininglargeimagesfailwhenGZipped. annotate.setDisableGZipContent(true); BatchAnnotateImagesResponsebatchResponse=annotate.execute(); assertbatchResponse.getResponses().size()==1; AnnotateImageResponseresponse=batchResponse.getResponses().get(0); if(response.getFaceAnnotations()==null){ thrownewIOException( response.getError()!=null ?response.getError().getMessage() :"Unknownerrorgettingimageannotations"); } returnresponse.getFaceAnnotations(); } Node.js samples/faceDetection.js ViewonGitHub asyncfunctiondetectFaces(inputFile){ //MakeacalltotheVisionAPItodetectthefaces constrequest={image:{source:{filename:inputFile}}}; constresults=awaitclient.faceDetection(request); constfaces=results[0].faceAnnotations; constnumFaces=faces.length; console.log(`Found${numFaces}face${numFaces===1?'':'s'}.`); returnfaces; } Python samples/snippets/face_detection/faces.py ViewonGitHub defdetect_face(face_file,max_results=4): """UsestheVisionAPItodetectfacesinthegivenfile. Args: face_file:Afile-likeobjectcontaininganimagewithfaces. Returns: AnarrayofFaceobjectswithinformationaboutthepicture. """ client=vision.ImageAnnotatorClient() content=face_file.read() image=vision.Image(content=content) returnclient.face_detection( image=image,max_results=max_results).face_annotations Processtheresponse Congratulations-you'vedetectedthefacesinyourimage!The responsetoourfaceannotationrequestincludesabunchof metadataaboutthedetectedfaces,whichincludecoordinates ofapolygonencompassingtheface.Atthispoint,though,this isonlyalistofnumbers.Let'susethemtoconfirmthatyouhave,infact, foundthefacesinyourimage.We'lldrawpolygonsontoacopyoftheimage, usingthecoordinatesreturnedbytheVisionAPI: Java vision/face-detection/src/main/java/com/google/cloud/vision/samples/facedetect/FaceDetectApp.java ViewonGitHub /**Readsimage{@codeinputPath}andwrites{@codeoutputPath}with{@codefaces}outlined.*/ privatestaticvoidwriteWithFaces(PathinputPath,PathoutputPath,Listfaces) throwsIOException{ BufferedImageimg=ImageIO.read(inputPath.toFile()); annotateWithFaces(img,faces); ImageIO.write(img,"jpg",outputPath.toFile()); } /**Annotatesanimage{@codeimg}withapolygonaroundeachfacein{@codefaces}.*/ publicstaticvoidannotateWithFaces(BufferedImageimg,Listfaces){ for(FaceAnnotationface:faces){ annotateWithFace(img,face); } } /**Annotatesanimage{@codeimg}withapolygondefinedby{@codeface}.*/ privatestaticvoidannotateWithFace(BufferedImageimg,FaceAnnotationface){ Graphics2Dgfx=img.createGraphics(); Polygonpoly=newPolygon(); for(Vertexvertex:face.getFdBoundingPoly().getVertices()){ poly.addPoint(vertex.getX(),vertex.getY()); } gfx.setStroke(newBasicStroke(5)); gfx.setColor(newColor(0x00ff00)); gfx.draw(poly); } Node.jsWeusethenode-canvaslibrarytodrawontoimages. samples/faceDetection.js ViewonGitHub asyncfunctionhighlightFaces(inputFile,faces,outputFile,PImage){ //Opentheoriginalimage conststream=fs.createReadStream(inputFile); letpromise; if(inputFile.match(/\.jpg$/)){ promise=PImage.decodeJPEGFromStream(stream); }elseif(inputFile.match(/\.png$/)){ promise=PImage.decodePNGFromStream(stream); }else{ thrownewError(`Unknownfilenameextension${inputFile}`); } constimg=awaitpromise; constcontext=img.getContext('2d'); context.drawImage(img,0,0,img.width,img.height,0,0); //Nowdrawboxesaroundallthefaces context.strokeStyle='rgba(0,255,0,0.8)'; context.lineWidth='5'; faces.forEach(face=>{ context.beginPath(); letorigX=0; letorigY=0; face.boundingPoly.vertices.forEach((bounds,i)=>{ if(i===0){ origX=bounds.x; origY=bounds.y; context.moveTo(bounds.x,bounds.y); }else{ context.lineTo(bounds.x,bounds.y); } }); context.lineTo(origX,origY); context.stroke(); }); //Writetheresulttoafile console.log(`Writingtofile${outputFile}`); constwriteStream=fs.createWriteStream(outputFile); awaitPImage.encodePNGToStream(img,writeStream); } Python samples/snippets/face_detection/faces.py ViewonGitHub defhighlight_faces(image,faces,output_filename): """Drawsapolygonaroundthefaces,thensavestooutput_filename. Args: image:afilecontainingtheimagewiththefaces. faces:alistoffacesfoundinthefile.Thisshouldbeintheformat returnedbytheVisionAPI. output_filename:thenameoftheimagefiletobecreated,wherethe faceshavepolygonsdrawnaroundthem. """ im=Image.open(image) draw=ImageDraw.Draw(im) #Sepecifythefont-familyandthefont-size forfaceinfaces: box=[(vertex.x,vertex.y) forvertexinface.bounding_poly.vertices] draw.line(box+[box[0]],width=5,fill='#00ff00') #Placetheconfidencevalue/scoreofthedetectedfacesabovethe #detectionboxintheoutputimage draw.text(((face.bounding_poly.vertices)[0].x, (face.bounding_poly.vertices)[0].y-30), str(format(face.detection_confidence,'.3f'))+'%', fill='#FF0000') im.save(output_filename) Putitalltogether Java vision/face-detection/src/main/java/com/google/cloud/vision/samples/facedetect/FaceDetectApp.java ViewonGitHub /**AnnotatesanimageusingtheVisionAPI.*/ publicstaticvoidmain(String[]args)throwsIOException,GeneralSecurityException{ if(args.length!=2){ System.err.println("Usage:"); System.err.printf( "\tjava%sinputImagePathoutputImagePath\n",FaceDetectApp.class.getCanonicalName()); System.exit(1); } PathinputPath=Paths.get(args[0]); PathoutputPath=Paths.get(args[1]); if(!outputPath.toString().toLowerCase().endsWith(".jpg")){ System.err.println("outputImagePathmusthavethefileextension'jpg'."); System.exit(1); } FaceDetectAppapp=newFaceDetectApp(getVisionService()); Listfaces=app.detectFaces(inputPath,MAX_RESULTS); System.out.printf("Found%dface%s\n",faces.size(),faces.size()==1?"":"s"); System.out.printf("Writingtofile%s\n",outputPath); app.writeWithFaces(inputPath,outputPath,faces); } ... Tobuildandrunthesample,runthefollowingcommandsfromthesamplecodedirectory: mvncleancompileassembly:single java-cptarget/vision-face-detection-1.0-SNAPSHOT-jar-with-dependencies.jar\ com.google.cloud.vision.samples.facedetect.FaceDetectApp\ data/face.jpg\ output.jpg Node.js samples/faceDetection.js ViewonGitHub asyncfunctionmain(inputFile,outputFile){ constPImage=require('pureimage'); outputFile=outputFile||'out.png'; constfaces=awaitdetectFaces(inputFile); console.log('Highlighting...'); awaithighlightFaces(inputFile,faces,outputFile,PImage); console.log('Finished!'); } Torunthesample,runthefollowingcommandfromthesamplecodedirectory: nodefaceDetectionresources/face.png Python samples/snippets/face_detection/faces.py ViewonGitHub defmain(input_filename,output_filename,max_results): withopen(input_filename,'rb')asimage: faces=detect_face(image,max_results) print('Found{}face{}'.format( len(faces),''iflen(faces)==1else's')) print('Writingtofile{}'.format(output_filename)) #Resetthefilepointer,sowecanreadthefileagain image.seek(0) highlight_faces(image,faces,output_filename) Cleanup ToavoidincurringchargestoyourGoogleCloudaccountfortheresourcesusedinthis tutorial,eitherdeletetheprojectthatcontainstheresources,orkeeptheprojectand deletetheindividualresources. Caution:Deletingaprojecthasthefollowingeffects: Everythingintheprojectisdeleted.Ifyouusedanexistingprojectfor thistutorial,whenyoudeleteit,youalsodeleteanyotherworkyou'vedoneintheproject. CustomprojectIDsarelost. Whenyoucreatedthisproject,youmighthavecreatedacustomprojectIDthatyouwanttousein thefuture.TopreservetheURLsthatusetheprojectID,suchasanappspot.com URL,deleteselectedresourcesinsidetheprojectinsteadofdeletingthewholeproject. Ifyouplantoexploremultipletutorialsandquickstarts,reusingprojectscanhelpyouavoid exceedingprojectquotalimits. IntheCloudconsole,gototheManageresourcespage. GotoManageresources Intheprojectlist,selecttheprojectthatyou wanttodelete,andthenclickDelete. Inthedialog,typetheprojectID,andthenclick Shutdowntodeletetheproject. Sendfeedback Exceptasotherwisenoted,thecontentofthispageislicensedundertheCreativeCommonsAttribution4.0License,andcodesamplesarelicensedundertheApache2.0License.Fordetails,seetheGoogleDevelopersSitePolicies.JavaisaregisteredtrademarkofOracleand/oritsaffiliates. Lastupdated2022-05-06UTC. [{ "type":"thumb-down", "id":"hardToUnderstand", "label":"Hardtounderstand" },{ "type":"thumb-down", "id":"incorrectInformationOrSampleCode", "label":"Incorrectinformationorsamplecode" },{ "type":"thumb-down", "id":"missingTheInformationSamplesINeed", "label":"Missingtheinformation/samplesIneed" },{ "type":"thumb-down", "id":"otherDown", "label":"Other" }] [{ "type":"thumb-up", "id":"easyToUnderstand", "label":"Easytounderstand" },{ "type":"thumb-up", "id":"solvedMyProblem", "label":"Solvedmyproblem" },{ "type":"thumb-up", "id":"otherUp", "label":"Other" }] Needtotellusmore? 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