Detect multiple objects

  // localizeObjects gets objects and bounding boxes from the Vision API for an image at the given file path. 
 func 
  
 localizeObjects 
 ( 
 w 
  
 io 
 . 
 Writer 
 , 
  
 file 
  
 string 
 ) 
  
 error 
  
 { 
  
 ctx 
  
 := 
  
 context 
 . 
 Background 
 () 
  
 client 
 , 
  
 err 
  
 := 
  
 vision 
 . 
 NewImageAnnotatorClient 
 ( 
 ctx 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 f 
 , 
  
 err 
  
 := 
  
 os 
 . 
 Open 
 ( 
 file 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 defer 
  
 f 
 . 
 Close 
 () 
  
 image 
 , 
  
 err 
  
 := 
  
 vision 
 . 
 NewImageFromReader 
 ( 
 f 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 annotations 
 , 
  
 err 
  
 := 
  
 client 
 . 
 LocalizeObjects 
 ( 
 ctx 
 , 
  
 image 
 , 
  
 nil 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 if 
  
 len 
 ( 
 annotations 
 ) 
  
 == 
  
 0 
  
 { 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 "No objects found." 
 ) 
  
 return 
  
 nil 
  
 } 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 "Objects:" 
 ) 
  
 for 
  
 _ 
 , 
  
 annotation 
  
 := 
  
 range 
  
 annotations 
  
 { 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 annotation 
 . 
 Name 
 ) 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 annotation 
 . 
 Score 
 ) 
  
 for 
  
 _ 
 , 
  
 v 
  
 := 
  
 range 
  
 annotation 
 . 
 BoundingPoly 
 . 
 NormalizedVertices 
  
 { 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "(%f,%f)\n" 
 , 
  
 v 
 . 
 X 
 , 
  
 v 
 . 
 Y 
 ) 
  
 } 
  
 } 
  
 return 
  
 nil 
 } 
 

  /** 
 * Detects localized objects in the specified local image. 
 * 
 * @param filePath The path to the file to perform localized object detection on. 
 * @throws Exception on errors while closing the client. 
 * @throws IOException on Input/Output errors. 
 */ 
 public 
  
 static 
  
 void 
  
 detectLocalizedObjects 
 ( 
 String 
  
 filePath 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 List<AnnotateImageRequest> 
  
 requests 
  
 = 
  
 new 
  
 ArrayList 
<> (); 
  
 ByteString 
  
 imgBytes 
  
 = 
  
 ByteString 
 . 
 readFrom 
 ( 
 new 
  
 FileInputStream 
 ( 
 filePath 
 )); 
  
 Image 
  
 img 
  
 = 
  
 Image 
 . 
 newBuilder 
 (). 
 setContent 
 ( 
 imgBytes 
 ). 
 build 
 (); 
  
 AnnotateImageRequest 
  
 request 
  
 = 
  
 AnnotateImageRequest 
 . 
 newBuilder 
 () 
  
 . 
 addFeatures 
 ( 
 Feature 
 . 
 newBuilder 
 (). 
 setType 
 ( 
 Type 
 . 
 OBJECT_LOCALIZATION 
 )) 
  
 . 
 setImage 
 ( 
 img 
 ) 
  
 . 
 build 
 (); 
  
 requests 
 . 
 add 
 ( 
 request 
 ); 
  
 // Initialize client that will be used to send requests. This client only needs to be created 
  
 // once, and can be reused for multiple requests. After completing all of your requests, call 
  
 // the "close" method on the client to safely clean up any remaining background resources. 
  
 try 
  
 ( 
 ImageAnnotatorClient 
  
 client 
  
 = 
  
 ImageAnnotatorClient 
 . 
 create 
 ()) 
  
 { 
  
 // Perform the request 
  
 BatchAnnotateImagesResponse 
  
 response 
  
 = 
  
 client 
 . 
 batchAnnotateImages 
 ( 
 requests 
 ); 
  
 List<AnnotateImageResponse> 
  
 responses 
  
 = 
  
 response 
 . 
 getResponsesList 
 (); 
  
 // Display the results 
  
 for 
  
 ( 
 AnnotateImageResponse 
  
 res 
  
 : 
  
 responses 
 ) 
  
 { 
  
 for 
  
 ( 
 LocalizedObjectAnnotation 
  
 entity 
  
 : 
  
 res 
 . 
 getLocalizedObjectAnnotationsList 
 ()) 
  
 { 
  
 System 
 . 
 out 
 . 
 format 
 ( 
 "Object name: %s%n" 
 , 
  
 entity 
 . 
 getName 
 ()); 
  
 System 
 . 
 out 
 . 
 format 
 ( 
 "Confidence: %s%n" 
 , 
  
 entity 
 . 
 getScore 
 ()); 
  
 System 
 . 
 out 
 . 
 format 
 ( 
 "Normalized Vertices:%n" 
 ); 
  
 entity 
  
 . 
 getBoundingPoly 
 () 
  
 . 
 getNormalizedVerticesList 
 () 
  
 . 
 forEach 
 ( 
 vertex 
  
 - 
>  
 System 
 . 
 out 
 . 
 format 
 ( 
 "- (%s, %s)%n" 
 , 
  
 vertex 
 . 
 getX 
 (), 
  
 vertex 
 . 
 getY 
 ())); 
  
 } 
  
 } 
  
 } 
 } 
 

  // Imports the Google Cloud client libraries 
 const 
  
 vision 
  
 = 
  
 require 
 ( 
 '@google-cloud/vision' 
 ); 
 const 
  
 fs 
  
 = 
  
 require 
 ( 
 'fs' 
 ); 
 // Creates a client 
 const 
  
 client 
  
 = 
  
 new 
  
 vision 
 . 
 ImageAnnotatorClient 
 (); 
 /** 
 * TODO(developer): Uncomment the following line before running the sample. 
 */ 
 // const fileName = `/path/to/localImage.png`; 
 const 
  
 request 
  
 = 
  
 { 
  
 image 
 : 
  
 { 
 content 
 : 
  
 fs 
 . 
 readFileSync 
 ( 
 fileName 
 )}, 
 }; 
 const 
  
 [ 
 result 
 ] 
  
 = 
  
 await 
  
 client 
 . 
 objectLocalization 
 ( 
 request 
 ); 
 const 
  
 objects 
  
 = 
  
 result 
 . 
 localizedObjectAnnotations 
 ; 
 objects 
 . 
 forEach 
 ( 
 object 
  
 = 
>  
 { 
  
 console 
 . 
 log 
 ( 
 `Name: 
 ${ 
 object 
 . 
 name 
 } 
 ` 
 ); 
  
 console 
 . 
 log 
 ( 
 `Confidence: 
 ${ 
 object 
 . 
 score 
 } 
 ` 
 ); 
  
 const 
  
 vertices 
  
 = 
  
 object 
 . 
 boundingPoly 
 . 
 normalizedVertices 
 ; 
  
 vertices 
 . 
 forEach 
 ( 
 v 
  
 = 
>  
 console 
 . 
 log 
 ( 
 `x: 
 ${ 
 v 
 . 
 x 
 } 
 , y: 
 ${ 
 v 
 . 
 y 
 } 
 ` 
 )); 
 }); 
 

  def 
  
 localize_objects 
 ( 
 path 
 ): 
  
 """Localize objects in the local image. 
 Args: 
 path: The path to the local file. 
 """ 
 from 
  
 google.cloud 
  
 import 
 vision 
 client 
 = 
 vision 
 . 
 ImageAnnotatorClient 
 () 
 with 
 open 
 ( 
 path 
 , 
 "rb" 
 ) 
 as 
 image_file 
 : 
 content 
 = 
 image_file 
 . 
 read 
 () 
 image 
 = 
 vision 
 . 
 Image 
 ( 
 content 
 = 
 content 
 ) 
 objects 
 = 
 client 
 . 
 object_localization 
 ( 
 image 
 = 
 image 
 ) 
 . 
 localized_object_annotations 
 print 
 ( 
 f 
 "Number of objects found: 
 { 
 len 
 ( 
 objects 
 ) 
 } 
 " 
 ) 
 for 
 object_ 
 in 
 objects 
 : 
 print 
 ( 
 f 
 " 
 \n 
 { 
 object_ 
 . 
 name 
 } 
 (confidence: 
 { 
 object_ 
 . 
 score 
 } 
 )" 
 ) 
 print 
 ( 
 "Normalized bounding polygon vertices: " 
 ) 
 for 
 vertex 
 in 
 object_ 
 . 
 bounding_poly 
 . 
 normalized_vertices 
 : 
 print 
 ( 
 f 
 " - ( 
 { 
 vertex 
 . 
 x 
 } 
 , 
 { 
 vertex 
 . 
 y 
 } 
 )" 
 )