【Android】使用OpenCV提取人体肤色区域

手势动态识别（基于opencv的简单实现）
http://blog.csdn.net/anqing715/article/details/17653709


基于OpenCV的实时手势识别算法研究_许艳旭
http://wenku.baidu.com/view/c7a2c97e998fcc22bdd10d11.html


基于OpenCV动态手势识别的实现
http://wenku.baidu.com/view/e0c708efad51f01dc281f1dd.html

MainActivity.java

package com.duanjiwei.takephoto;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Environment;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import org.opencv.android.BaseLoaderCallback;import org.opencv.android.LoaderCallbackInterface;import org.opencv.android.OpenCVLoader;import org.opencv.android.Utils;import org.opencv.core.Core;import org.opencv.core.CvType;import org.opencv.core.Mat;import org.opencv.core.MatOfPoint;import org.opencv.core.Point;import org.opencv.core.Scalar;import org.opencv.core.Size;import org.opencv.imgproc.Imgproc;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Random;//public class MainActivity extends AppCompatActivity {public class MainActivity extends Activity {    public static final int TAKE_PHOTO = 1;    //public static final int CROP_PHOTO = 2;    private Button takephoto;    private ImageView picture;    private Uri imageUri;    Mat imageMat;    private static final String TAG = "OCVSample::Activity";    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {        @Override        public void onManagerConnected(int status) {            switch (status) {                case LoaderCallbackInterface.SUCCESS:                {                    Log.i(TAG, "OpenCV loaded successfully");                    imageMat=new Mat();                } break;                default:                {                    super.onManagerConnected(status);                } break;            }        }    };    @Override    public void onResume()    {        super.onResume();        if (!OpenCVLoader.initDebug()) {            Log.d("OpenCV", "Internal OpenCV library not found. Using OpenCV Manager for initialization");            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_10, this, mLoaderCallback);        } else {            Log.d("OpenCV", "OpenCV library found inside package. Using it!");            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        takephoto = (Button)findViewById(R.id.take_photo);        picture   = (ImageView)findViewById(R.id.picture);        takephoto.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                File outputImage = new File(Environment.getExternalStorageDirectory(), "output_image.jpg");                try {                    if (outputImage.exists()) {                        outputImage.delete();                    }                    outputImage.createNewFile();                }catch (IOException e){                    e.printStackTrace();                }                imageUri = Uri.fromFile(outputImage);                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, TAKE_PHOTO);            }        });    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data){        switch (requestCode){            case TAKE_PHOTO:                //if (resultCode == RESULT_OK){                    //Intent intent = new Intent("com.android.camera.action.CROP");                    //intent.setDataAndType(imageUri, "image/*");                   // intent.putExtra("scale", true);                    //intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);                    //startActivityForResult(intent, CROP_PHOTO);                //}                //break;            //case CROP_PHOTO:                if (resultCode == RESULT_OK){                    try{                        //获取原图                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        picture.setImageBitmap(bitmap);                        //图像处理                        Mat mat_src = new Mat(bitmap.getHeight(), bitmap.getWidth(), CvType.CV_8UC4);                        Utils.bitmapToMat(bitmap, mat_src);                        Mat mat_gray = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC1);                        Imgproc.cvtColor(mat_src, mat_gray, Imgproc.COLOR_BGRA2GRAY, 1);                        //-------------------------------------------------------------------                        Mat frame = new Mat(bitmap.getHeight(), bitmap.getWidth(), CvType.CV_8UC4);                        mat_src.copyTo(frame);                        Mat frameHSV = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC3);;   // hsv空间                        Mat mask = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC1);                        Mat dst = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC3); // 输出图像                        //dst.copyTo(frame);                        // 中值滤波，去除椒盐噪声                        Imgproc.medianBlur(frame, frame, 5);                        Imgproc.cvtColor(frame, frameHSV, Imgproc.COLOR_RGB2HSV, 3);                        Mat dstTemp1 = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC1);                        Mat dstTemp2 = new Mat(mat_src.cols(), mat_src.rows(), CvType.CV_8UC1);                        // 对HSV空间进行量化，得到二值图像，亮的部分为手的形状                        Core.inRange(frameHSV, new Scalar(0, 30, 30), new Scalar(40, 170, 256), dstTemp1);                        Core.inRange(frameHSV, new Scalar(156, 30, 30), new Scalar(180, 170, 256), dstTemp2);                        Core.bitwise_or(dstTemp1, dstTemp2, mask);                        // 形态学操作，去除噪声，并使手的边界更加清晰                        Mat element = Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size(3, 3));                        Imgproc.erode(mask, mask, element);                        Imgproc.morphologyEx(mask, mask, Imgproc.MORPH_OPEN, element);                        Imgproc.dilate(mask, mask, element);                        Imgproc.morphologyEx(mask, mask, Imgproc.MORPH_CLOSE, element);                        frame.copyTo(dst, mask);//                        List<MatOfPoint> contourList = new ArrayList<MatOfPoint>();//                        Mat hierarchy = new Mat();////                        // 得到手的轮廓//                        Imgproc.findContours(mask, contourList, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);////                        Random r = new Random();//                        int nContoursNum = contourList.size();//                        for (int i = 0; i < nContoursNum; i++)//                        {//                            Imgproc.drawContours(dst, contourList, i, new Scalar(r.nextInt(255), r.nextInt(255), r.nextInt(255)), -1);//                        }                        //-------------------------------------------------------------------                        //图像显示                        Bitmap bmp_gray = Bitmap.createBitmap(mat_gray.cols(), mat_gray.rows(), Bitmap.Config.ARGB_8888 );                        Utils.matToBitmap(dst, bmp_gray);                        picture.setImageBitmap(bmp_gray);                    }catch (FileNotFoundException e){                        e.printStackTrace();                    }                }                break;            default:                break;        }    }}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.duanjiwei.takephoto.MainActivity">    <Button        android:id = "@+id/take_photo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text = "take photo"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true" />    <ImageView        android:id = "@+id/picture"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity = "center_horizontal"/></RelativeLayout>