openCV人脸识别
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1.下载编译好的SDK
2.解压后，新建项目，拷贝对应文件到项目中： 
3.CmakeLists.txt修改如下：
cmake_minimum_required(VERSION 3.4.1)include_directories(src/main/cpp/include)file(GLOB my_source_path src/main/cpp/*.cpp src/main/cpp/*.c)add_library( native-lib SHARED ${my_source_path} )add_library( lib_opencv SHARED IMPORTED)set_target_properties( lib_opencv PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)target_link_libraries( native-lib android log jnigraphics lib_opencv )4.在cpp下新建native-lib.h
//// Created by ygdx_lk on 17/11/20.//#ifndef IMAGEFACERECOGNITION_NATIVE_LIB_H#define IMAGEFACERECOGNITION_NATIVE_LIB_H#include <jni.h>#include <string>#include <android/log.h>#include <android/bitmap.h>#include <opencv2/opencv.hpp>#include <android/native_window_jni.h>#define LOG_TAG "native"#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)extern "C"{using namespace cv;using namespace std;CascadeClassifier *faceClassifier;ANativeWindow *nativeWindow;JNIEXPORT void JNICALL Java_com_study_imagefacerecognition_MainActivity_loadModel(JNIEnv *env, jobject instance, jstring detectMode_);JNIEXPORT jboolean JNICALL Java_com_study_imagefacerecognition_MainActivity_process(JNIEnv *env, jobject instance, jobject bitmap);JNIEXPORT void JNICALL Java_com_study_imagefacerecognition_MainActivity_setSurfaceview(JNIEnv *env, jobject instance, jobject surface, jint w, jint h);JNIEXPORT void JNICALL Java_com_study_imagefacerecognition_MainActivity_destroy(JNIEnv *env, jobject instance);void bitmap2Mat(JNIEnv *env, jobject bitmap, Mat &dst);};#endif //IMAGEFACERECOGNITION_NATIVE_LIB_H5.native-lib.cpp
#include "native-lib.h"void Java_com_study_imagefacerecognition_MainActivity_loadModel(JNIEnv *env, jobject instance, jstring detectMode_) { const char *detectMode = env->GetStringUTFChars(detectMode_, 0); //获取一个Classifier model faceClassifier = new CascadeClassifier(detectMode); env->ReleaseStringUTFChars(detectMode_, detectMode);}jboolean Java_com_study_imagefacerecognition_MainActivity_process(JNIEnv *env, jobject instance, jobject bitmap) { int ret = 1; Mat src; bitmap2Mat(env, bitmap, src); imwrite("/sdcard/d.png", src); if(faceClassifier){ vector<Rect> faces; Mat grayMat; //图像灰度化 cvtColor(src, grayMat, CV_BGR2GRAY); imwrite("/sdcard/huidu.png", grayMat); //直方图均衡化 增强对比效果 equalizeHist(grayMat, grayMat); imwrite("/sdcard/e.png", grayMat); //识别，并将识别到的头部区域写入faces向量中 faceClassifier->detectMultiScale(grayMat, faces); grayMat.release(); for (int i = 0; i < faces.size(); ++i) { Rect face = faces[i]; //Scalar(0, 255, 255) 参数含义：矩形的颜色 rectangle(src, face.tl(), face.br(), Scalar(0, 255, 255)); } } if(!nativeWindow){ ret = 0;// goto end; src.release(); return ret; } ANativeWindow_Buffer window_buffer; if(ANativeWindow_lock(nativeWindow, &window_buffer, 0)){ ret = 0;// goto end; src.release(); return ret; } imwrite("/sdcard/c.png", src); //绘制 cvtColor(src, src, CV_BGR2RGBA); imwrite("/sdcard/b.png", src); int windowWidth = ANativeWindow_getWidth(nativeWindow); int windowHeight = ANativeWindow_getHeight(nativeWindow); LOGI("ROW:%d, STEP:%d window_w:%d, window_h:%d", src.rows, (int)src.step, windowWidth, windowHeight);// resize(src, src, Size(window_buffer.width/2, window_buffer.height/2)); // 缓冲区的地址／ uint8_t *dst = (uint8_t *) window_buffer.bits; // 每行的内存大小 int dstStride = window_buffer.stride * 4; for (int i = 0; i < src.rows; ++i) { const Mat &row = src.row(i); uchar *data = row.data; int step = row.step;//数据量 LOGI("size: dstStride:%d step:%d rows:%d wh:%d", dstStride, step, src.rows, window_buffer.height); memcpy(dst + (i) * (dstStride) + (dstStride - step) / 2, data, step); }// memcpy(window_buffer.bits, src.data, window_buffer.height * window_buffer.width * 4); ANativeWindow_unlockAndPost(nativeWindow);// end: src.release(); return ret;}void bitmap2Mat(JNIEnv *env, jobject bitmap, Mat &dst) {#if 0 AndroidBitmapInfo info; void *pixels = 0; //获取bitmap信息 CV_Assert(AndroidBitmap_getInfo(env, bitmap, &info) >= 0); //必须是 rgba8888 rgb565 CV_Assert(info.format == ANDROID_BITMAP_FORMAT_RGBA_8888); //lock 获得数据 CV_Assert(AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0); CV_Assert(pixels); dst.create(info.height, info.width, CV_8UC3); LOGI("bitmap2Mat: RGBA_8888 bitmap -> Mat"); Mat tmp; tmp = Mat(info.height, info.width, CV_8UC3, pixels); cvtColor(tmp, dst, COLOR_RGBA2BGR); tmp.release(); AndroidBitmap_unlockPixels(env, bitmap);#else AndroidBitmapInfo info; void* pixels = 0; try { LOGI("nBitmapToMat"); CV_Assert( AndroidBitmap_getInfo(env, bitmap, &info) >= 0 ); CV_Assert( info.format == ANDROID_BITMAP_FORMAT_RGBA_8888 || info.format == ANDROID_BITMAP_FORMAT_RGB_565 ); CV_Assert( AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0 ); CV_Assert( pixels ); dst.create(info.height, info.width, CV_8UC4); if( info.format == ANDROID_BITMAP_FORMAT_RGBA_8888 ) { LOGI("nBitmapToMat: RGBA_8888 -> CV_8UC4"); Mat tmp(info.height, info.width, CV_8UC4, pixels);// if(needUnPremultiplyAlpha) cvtColor(tmp, dst, COLOR_mRGBA2RGBA);// else tmp.copyTo(dst); tmp.copyTo(dst);// cvtColor(tmp, dst, COLOR_mRGBA2RGBA); cvtColor(dst, dst, COLOR_RGBA2BGR); tmp.release(); } else { // info.format == ANDROID_BITMAP_FORMAT_RGB_565 LOGI("nBitmapToMat: RGB_565 -> CV_8UC4"); Mat tmp(info.height, info.width, CV_8UC2, pixels);// cvtColor(tmp, dst, COLOR_BGR5652RGBA); cvtColor(tmp, dst, COLOR_BGR5652BGR); tmp.release(); } AndroidBitmap_unlockPixels(env, bitmap); return; } catch(const cv::Exception& e) { AndroidBitmap_unlockPixels(env, bitmap); LOGI("nBitmapToMat catched cv::Exception: %s", e.what()); jclass je = env->FindClass("org/opencv/core/CvException"); if(!je) je = env->FindClass("java/lang/Exception"); env->ThrowNew(je, e.what()); return; } catch (...) { AndroidBitmap_unlockPixels(env, bitmap); LOGI("nBitmapToMat catched unknown exception (...)"); jclass je = env->FindClass("java/lang/Exception"); env->ThrowNew(je, "Unknown exception in JNI code {nBitmapToMat}"); return; }#endif}void Java_com_study_imagefacerecognition_MainActivity_setSurfaceview(JNIEnv *env, jobject instance, jobject surface, jint w, jint h) { if(surface && w && h){ if(nativeWindow){ ANativeWindow_release(nativeWindow); nativeWindow = 0; } nativeWindow = ANativeWindow_fromSurface(env, surface); if(nativeWindow){ LOGI("ANativeWindow_setBuffersGeometry %d, %d", w, h); ANativeWindow_setBuffersGeometry(nativeWindow, w, h, WINDOW_FORMAT_RGBA_8888); } } else{ if(nativeWindow){ ANativeWindow_release(nativeWindow); nativeWindow = 0; } }}void Java_com_study_imagefacerecognition_MainActivity_destroy(JNIEnv *env, jobject instance) { if(faceClassifier){ delete faceClassifier; faceClassifier = 0; } if(nativeWindow){ ANativeWindow_release(nativeWindow); nativeWindow = 0; }}6.MainActivity.java
package com.study.imagefacerecognition;import android.Manifest;import android.app.AlertDialog;import android.app.ProgressDialog;import android.content.DialogInterface;import android.content.Intent;import android.content.pm.PackageManager;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.AsyncTask;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.text.TextUtils;import android.util.Log;import android.view.Surface;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.Button;import android.widget.Toast;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity { // Used to load the 'native-lib' library on application startup. static { System.loadLibrary("native-lib"); } private static final String TAG = "MainActivity"; private int width_tmp, height_tmp; private native void loadModel(String detectMode); private native boolean process(Bitmap bitmap); private native void setSurfaceview(Surface surface, int w, int h); public native void destroy(); private Button bt_load; private SurfaceView surfaceview; private ProgressDialog pd; private Bitmap bm; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bt_load = (Button)findViewById(R.id.bt_load); surfaceview = (SurfaceView)findViewById(R.id.surfaceview); bt_load.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { openImages(); } }); surfaceview.getHolder().addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { setSurfaceview(holder.getSurface(), width_tmp, height_tmp); safeProcess(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { } }); loadData(); if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ insertDummyContactWrapper(); } } @Override protected void onDestroy() { super.onDestroy(); destroy(); safeRecycled(); } private void openImages() { Intent intent; if(Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT){ intent = new Intent(); intent.setAction(Intent.ACTION_GET_CONTENT); }else { intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); } intent.setType("image/*"); startActivityForResult(Intent.createChooser(intent, "选择图片"), 666); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode == 666 && data != null){ getResult(data.getData()); } } private void getResult(Uri uri) { safeRecycled(); String imagePath = null; if(uri != null){ Log.i(TAG, "getResult: " + uri.toString()); if("file".equals(uri.getScheme())){ imagePath = uri.getPath(); }else if("content".equals(uri.getScheme())){ String[] filePathColumns = {MediaStore.Images.Media.DATA}; Cursor c = getContentResolver().query(uri, filePathColumns, null, null, null); if(c != null){ if(c.moveToFirst()){ int columnIndex = c.getColumnIndex(filePathColumns[0]); imagePath = c.getString(columnIndex); } c.close(); } } } if(!TextUtils.isEmpty(imagePath)){ Log.i(TAG, "getResult: " + imagePath); bm = toBitmap(imagePath); Log.i(TAG, "getResult getbm: " + bm); safeProcess(); } } private void safeProcess() { if(bm != null && !bm.isRecycled()){ process(bm); } } private void safeRecycled() { if(bm != null && !bm.isRecycled()){ bm.recycle(); } bm = null; } private Bitmap toBitmap(String imagePath) { if(TextUtils.isEmpty(imagePath)){ return null; } BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(imagePath, o); width_tmp = o.outWidth; height_tmp = o.outHeight; int scale = 1; while (true){ if(width_tmp <= surfaceview.getWidth() && height_tmp <= surfaceview.getHeight()){ break; } width_tmp /= 2; height_tmp /= 2; scale *= 2; } BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = scale; options.outHeight = height_tmp; options.outWidth = width_tmp; Log.i(TAG, "toBitmap: "+ width_tmp + "----" + height_tmp); setSurfaceview(surfaceview.getHolder().getSurface(), width_tmp, height_tmp); return BitmapFactory.decodeFile(imagePath, options); } private void loadData() { new AsyncTask<Void, Void, Void>(){ @Override protected Void doInBackground(Void... voids) { File dir = new File(Environment.getExternalStorageDirectory(), "face"); copyAssetsFile("haarcascade_frontalface_alt.xml", dir); File file = new File(dir, "haarcascade_frontalface_alt.xml"); loadModel(file.getAbsolutePath()); return null; } private void copyAssetsFile(String s, File dir) { if(!dir.exists()){ dir.mkdirs(); } File file = new File(dir, s); if(!file.exists()){ InputStream is = null; FileOutputStream fos = null; try { byte[] buffer = new byte[1024]; int len; is = getAssets().open(s); fos = new FileOutputStream(file); while ((len = is.read(buffer)) != -1) { fos.write(buffer, 0, len); } fos.flush(); }catch (Exception e){ e.printStackTrace(); }finally { if(fos != null){ try { fos.close(); } catch (IOException e) { e.printStackTrace(); } fos = null; } if(is != null){ try { is.close(); } catch (IOException e) { e.printStackTrace(); } is = null; } } } } @Override protected void onPreExecute() { super.onPreExecute(); showLoading(); } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); hideLoading(); } }.execute(); } private void hideLoading() { if(pd != null){ pd.dismiss(); } } private void showLoading() { if(pd == null){ pd = new ProgressDialog(this); pd.setIndeterminate(true); } pd.show(); } final private int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124; private void insertDummyContactWrapper() { List<String> permissionsNeeded = new ArrayList<>(); final List<String> permissionsList = new ArrayList<String>(); if (!addPermission(permissionsList, Manifest.permission.READ_EXTERNAL_STORAGE)) permissionsNeeded.add("存储"); if (!addPermission(permissionsList, Manifest.permission.READ_PHONE_STATE)) permissionsNeeded.add("手机状态"); if (!addPermission(permissionsList, Manifest.permission.ACCESS_FINE_LOCATION)) permissionsNeeded.add("位置"); if (permissionsList.size() > 0) { if (permissionsNeeded.size() > 0) { // Need Rationale String message = "为了更好的使用LOOK,需要您授权" + permissionsNeeded.get(0); for (int i = 1; i < permissionsNeeded.size(); i++) message += "、" + permissionsNeeded.get(i); message += "权限"; showMessageOKCancel(message, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (Build.VERSION.SDK_INT >= 23) { requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS); } } }, new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { finish(); } }); return; } if (Build.VERSION.SDK_INT >= 23) { requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS); } return; } } private boolean addPermission(List<String> permissionsList, String permission) { if (Build.VERSION.SDK_INT >= 23 && checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) { permissionsList.add(permission); // Check for Rationale Option if (!shouldShowRequestPermissionRationale(permission)) return false; } return true; } private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener, DialogInterface.OnClickListener cancelListener) { new AlertDialog.Builder(this) .setMessage(message) .setPositiveButton("确定", okListener) .setNegativeButton("取消", cancelListener) .create() .show(); } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode) { case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: { Map<String, Integer> perms = new HashMap<>(); // Initial perms.put(Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED); perms.put(Manifest.permission.READ_PHONE_STATE, PackageManager.PERMISSION_GRANTED); perms.put(Manifest.permission.ACCESS_FINE_LOCATION, PackageManager.PERMISSION_GRANTED);// perms.put(Manifest.permission.ACCESS_COARSE_LOCATION, PackageManager.PERMISSION_GRANTED); // Fill with results for (int i = 0; i < permissions.length; i++) perms.put(permissions[i], grantResults[i]); // Check for ACCESS_FINE_LOCATION if (perms.get(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && perms.get(Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED && perms.get(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED// && perms.get(Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED ) { // All Permissions Granted } else { // Permission Denied Toast.makeText(this, "缺少权限", Toast.LENGTH_SHORT).show(); finish(); } } break; } }}阅读全文
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