Kotlin AWS Rekognition 转换

Question

我目前正在为 iOS 移植一个内置于 Swift 的应用程序。在 swift 中，通过以下方式进行重新识别调用：

将包导入到您的 podfile 后首先初始化客户端：

rekognitionClient = AWSRekognition.default()

然后创建一个 'faceRequest' 来调用该服务并查看您 collection 中的面孔是否与您发送的图像匹配：

guard let FaceRequest = AWSRekognitionSearchFacesByImageRequest() else
       {
           puts("Unable to initialize AWSRekognitionSearchfacerequest.")
           return
       }
       FaceRequest.collectionId = "MY_COLLECTION_NAME"
       FaceRequest.faceMatchThreshold = 75
       FaceRequest.maxFaces = 2
       let FacesourceImage = capturedImage
       let Faceimage = AWSRekognitionImage()
       Faceimage!.bytes = UIImageJPEGRepresentation(FacesourceImage!, 0.7)
       FaceRequest.image = Faceimage
       rekognitionClient.searchFaces(byImage:FaceRequest) { (response:AWSRekognitionSearchFacesByImageResponse?, error:Error?) in
           if error == nil
           {
               //print(response!)

               for faceMatch in (response?.faceMatches)! {
                     //do something
               }
           }
        }

我希望将其转换为 Kotlin，但在语法和发出请求时遇到问题。我有一张位图格式的图像，可以发送到服务。

这是我一直在尝试的示例之一：

fun doRekognitionRequest(bitmap: Bitmap){

    //this says AmazonRekognitionClient has been deprecated
    val rekognitionClient = AmazonRekognitionClient()

    //unresolved reference
    val facesImageRequest = facesByImageRequest()
}

这是我的导入：

import android.Manifest
import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.content.Intent
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.SurfaceTexture
import android.graphics.drawable.BitmapDrawable
import android.hardware.camera2.*
import android.net.Uri
import android.os.*
import android.util.Log
import android.view.*
import android.widget.Toast
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentTransaction
import kotlinx.android.synthetic.main.camera_layout.*
import pub.devrel.easypermissions.AfterPermissionGranted
import pub.devrel.easypermissions.EasyPermissions
import java.io.*
import java.io.File
import java.util.*
import android.provider.MediaStore
import androidx.core.content.FileProvider
import com.amazonaws.services.rekognition.AmazonRekognition;
import com.amazonaws.services.rekognition.AmazonRekognitionClient
import com.amazonaws.services.rekognition.model.FaceMatch;
import com.amazonaws.services.rekognition.model.Image;
import com.amazonaws.services.rekognition.model.S3Object;
import com.amazonaws.services.rekognition.model.SearchFacesByImageRequest;
import com.amazonaws.services.rekognition.model.SearchFacesByImageResult;

我正在尝试以这个人所做的为基础：https://github.com/awslabs/serverless-photo-recognition/blob/master/src/main/kotlin/com/budilov/rekognition/RekognitionService.kt

以及尝试将 java 示例代码从 rekognition 文档转换为 Kotlin，但没有成功。

https://docs.aws.amazon.com/rekognition/latest/dg/search-face-with-image-procedure.html

   AmazonRekognition rekognitionClient = AmazonRekognitionClientBuilder.defaultClient();

  ObjectMapper objectMapper = new ObjectMapper();

   // Get an image object from S3 bucket.
  Image image=new Image()
          .withS3Object(new S3Object()
                  .withBucket(bucket)
                  .withName(photo));

  // Search collection for faces similar to the largest face in the image.
  SearchFacesByImageRequest searchFacesByImageRequest = new SearchFacesByImageRequest()
          .withCollectionId(collectionId)
          .withImage(image)
          .withFaceMatchThreshold(70F)
          .withMaxFaces(2);

   SearchFacesByImageResult searchFacesByImageResult = 
           rekognitionClient.searchFacesByImage(searchFacesByImageRequest);

   System.out.println("Faces matching largest face in image from" + photo);
  List < FaceMatch > faceImageMatches = searchFacesByImageResult.getFaceMatches();
  for (FaceMatch face: faceImageMatches) {
      System.out.println(objectMapper.writerWithDefaultPrettyPrinter()
              .writeValueAsString(face));
     System.out.println();
  }

Kotlin 和 Android 对我来说都是新手，我来自 C# 和 Swift 背景，因此非常感谢任何帮助。干杯！

编辑:

设法让编译器看到 searchfacesbyImageRequest 构造函数。现在坚持将位图转换为图像。

    val facesImageRequest = SearchFacesByImageRequest()
    facesImageRequest.collectionId = "MY_COLLECTION_NAME"
    facesImageRequest.maxFaces = 2
    facesImageRequest.faceMatchThreshold = 75.0F
    facesImageRequest.image = Image(bitmap)

Answer 1

这是一种从 android.graphics.Bitmap

构造 com.amazonaws.services.rekognition.model.Image 的方法

val bitmap : Bitmap? = // Source of your picture
val byteBuffer = ByteBuffer.allocate(bitmap.byteCount)
bitmap?.copyPixelsToBuffer(byteBuffer)
val image = Image().withBytes(byteBuffer)

Answer 2

自 2021 年 8 月起，AWS 现在支持 Kotlin SDK。参见 https://aws.amazon.com/blogs/developer/aws-sdk-for-kotlin-alpha-release/。

Kotlin AWS Rekognition 转换

Kotlin AWS Rekognition Conversion

java

android

amazon-web-services

kotlin

amazon-rekognition