Android 使用Face++ SDK进行人脸识别和年龄检测
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Face++的官网：
http://www.faceplusplus.com.cn/
可以识别照片中的人脸位置，人物的年龄，性别，种族，是否微笑等信息。效果图：
首先创建应用，会分配给我们一个API Key和API Secret，然后下载“Java SDK（Android）”，导入Jar包和库文件，参考官方的Demo进行编写。
1.FaceDetectUtil帮助类:
package com.zms.carlauncher.util;import java.io.ByteArrayOutputStream;import org.json.JSONObject;import com.facepp.error.FaceppParseException;import com.facepp.http.HttpRequests;import com.facepp.http.PostParameters;import com.zms.carlauncher.Constant;import android.graphics.Bitmap;import android.graphics.Matrix;public class FaceDetectUtil { public interface FaceCallBack { void success(JSONObject result); void error(FaceppParseException exception); } public static void detect(final Bitmap bitmapDetect, final FaceCallBack faceCallBack) { new Thread(new Runnable() { @Override public void run() { try { // 请求 HttpRequests httpRequests = new HttpRequests( Constant.FACE_API_KEY, Constant.FACE_API_SECRET, true, true); // Log.v(TAG, "image size : " + img.getWidth() + " " + // img.getHeight()); ByteArrayOutputStream stream = new ByteArrayOutputStream(); float scale = Math.min(1, Math.min( 600f / bitmapDetect.getWidth(), 600f / bitmapDetect.getHeight())); Matrix matrix = new Matrix(); matrix.postScale(scale, scale); Bitmap imgSmall = Bitmap.createBitmap(bitmapDetect, 0, 0, bitmapDetect.getWidth(), bitmapDetect.getHeight(), matrix, false); // Log.v(TAG, "imgSmall size : " + imgSmall.getWidth() + " " // + imgSmall.getHeight()); imgSmall.compress(Bitmap.CompressFormat.JPEG, 100, stream); byte[] array = stream.toByteArray(); PostParameters params = new PostParameters(); params.setImg(array); JSONObject result = httpRequests.detectionDetect(params); if(faceCallBack!=null){ faceCallBack.success(result); } } catch (FaceppParseException e) { e.printStackTrace(); if(faceCallBack!=null){ faceCallBack.error(e); } } } }).start(); }}2.FaceDetectActivity:
package com.zms.carlauncher.ui;import java.io.ByteArrayOutputStream;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BitmapFactory.Options;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.provider.MediaStore.Images.ImageColumns;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import com.facepp.error.FaceppParseException;import com.facepp.http.HttpRequests;import com.facepp.http.PostParameters;import com.zms.carlauncher.Constant;import com.zms.carlauncher.R;import com.zms.carlauncher.util.FaceDetectUtil;public class FaceDetectActivity extends Activity { final private static String TAG = "FaceDetect"; final private int PICTURE_CHOOSE = 1; private ImageView imagePhoto = null; private Bitmap bitmapPhoto = null; private Button buttonDetect = null; private TextView textState = null; private View frameWait; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_face_detect); Button btnGetImage = (Button) this.findViewById(R.id.btnGetImage); btnGetImage.setOnClickListener(new MyOnClickListener()); frameWait = findViewById(R.id.frameWait); textState = (TextView) this.findViewById(R.id.textState); buttonDetect = (Button) this.findViewById(R.id.buttonDetect); buttonDetect.setVisibility(View.INVISIBLE); buttonDetect.setOnClickListener(new MyOnClickListener()); imagePhoto = (ImageView) this.findViewById(R.id.imagePhoto); imagePhoto.setImageBitmap(bitmapPhoto); } class MyOnClickListener implements View.OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.btnGetImage: // 读取图库图片 Intent photoPickerIntent = new Intent(Intent.ACTION_PICK); photoPickerIntent.setType("image/*"); startActivityForResult(photoPickerIntent, PICTURE_CHOOSE); break; case R.id.buttonDetect: frameWait.setVisibility(View.VISIBLE); FaceDetectUtil.detect(bitmapPhoto, new FaceDetectUtil.FaceCallBack() { @Override public void success(JSONObject result) { Message msg = Message.obtain(); msg.what = MSG_SUCCESS; msg.obj = result; faceHandler.sendMessage(msg); } @Override public void error(FaceppParseException exception) { Message msg = Message.obtain(); msg.what = MSG_ERROR; msg.obj = exception.getErrorMessage(); faceHandler.sendMessage(msg); } }); break; default: break; } } } private static final int MSG_SUCCESS = 0x111; private static final int MSG_ERROR = 0x112; private Handler faceHandler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case MSG_SUCCESS: frameWait.setVisibility(View.GONE); JSONObject rst = (JSONObject) msg.obj; Log.e(TAG, rst.toString()); prepareBitmap(rst); imagePhoto.setImageBitmap(bitmapPhoto); break; case MSG_ERROR: frameWait.setVisibility(View.GONE); String errorMsg = (String) msg.obj; if (TextUtils.isEmpty(errorMsg)) { textState.setText("Error"); } else { textState.setText(errorMsg); } break; default: break; } super.handleMessage(msg); } }; private Bitmap getGendorBitmap(int age, boolean isMale) { // frameWait.setVisibility(View.VISIBLE); TextView textAge = (TextView) frameWait.findViewById(R.id.textAge); textAge.setVisibility(View.VISIBLE); textAge.setText("" + age); if (isMale) { textAge.setTextColor(0xff1E88E5); textAge.setCompoundDrawablesWithIntrinsicBounds(getResources() .getDrawable(R.drawable.face_detect_male), null, null, null); } else { textAge.setTextColor(0xffff00ff); textAge.setCompoundDrawablesWithIntrinsicBounds(getResources() .getDrawable(R.drawable.face_detect_female), null, null, null); } textAge.setDrawingCacheEnabled(true); Bitmap bitmap = Bitmap.createBitmap(textAge.getDrawingCache()); textAge.destroyDrawingCache(); return bitmap; } protected void prepareBitmap(JSONObject rst) { // 画笔 Paint paint = new Paint(); paint.setColor(Color.WHITE); // paint.setStrokeWidth(Math.max(img.getWidth(), // img.getHeight()) / 100f); paint.setStrokeWidth(3); // 画布 Bitmap bitmap = Bitmap.createBitmap(bitmapPhoto.getWidth(), bitmapPhoto.getHeight(), bitmapPhoto.getConfig()); Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(bitmapPhoto, new Matrix(), null); try { // find out all faces JSONArray faceArray = rst.getJSONArray("face"); final int faceCount = faceArray.length(); textState.setText("Finished, " + faceCount + " faces."); for (int i = 0; i < faceCount; ++i) { float x, y, w, h; // 获取人脸中心 JSONObject faceObject = faceArray.getJSONObject(i); JSONObject positionObject = faceObject .getJSONObject("position"); x = (float) positionObject.getJSONObject("center").getDouble( "x"); y = (float) faceObject.getJSONObject("position") .getJSONObject("center").getDouble("y"); // 获取人脸大小 w = (float) positionObject.getDouble("width"); h = (float) positionObject.getDouble("height"); // 绘制人脸方框 x = x / 100 * bitmapPhoto.getWidth(); y = y / 100 * bitmapPhoto.getHeight(); w = w / 100 * bitmapPhoto.getWidth(); h = h / 100 * bitmapPhoto.getHeight(); canvas.drawLine(x - w / 2, y - h / 2, x - w / 2, y + h / 2, paint); canvas.drawLine(x - w / 2, y - h / 2, x + w / 2, y - h / 2, paint); canvas.drawLine(x + w / 2, y - h / 2, x + w / 2, y + h / 2, paint); canvas.drawLine(x - w / 2, y + h / 2, x + w / 2, y + h / 2, paint); // 性别和年龄 int age = faceObject.getJSONObject("attribute") .getJSONObject("age").getInt("value"); int range = faceObject.getJSONObject("attribute") .getJSONObject("age").getInt("range"); String gendorStr = faceObject.getJSONObject("attribute") .getJSONObject("gender").getString("value"); // Male-Female Bitmap ageBitmap = getGendorBitmap(age + range, "Male".equals(gendorStr)); int ageWidth = ageBitmap.getWidth(); int ageHeight = ageBitmap.getHeight(); if (bitmap.getWidth() < imagePhoto.getWidth() && bitmap.getHeight() < imagePhoto.getHeight()) { float ratio = Math.max(bitmap.getWidth() * 1.0f / imagePhoto.getWidth(), bitmap.getHeight() * 1.0f / imagePhoto.getHeight()); ageBitmap = Bitmap.createScaledBitmap(ageBitmap, (int) (ageWidth * ratio), (int) (ageHeight * ratio), false); } canvas.drawBitmap(ageBitmap, x - ageBitmap.getWidth() / 2, y - h / 2 - ageBitmap.getHeight(), null); } // save new image bitmapPhoto = bitmap; } catch (JSONException e) { e.printStackTrace(); FaceDetectActivity.this.runOnUiThread(new Runnable() { public void run() { textState.setText("Error."); } }); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { super.onActivityResult(requestCode, resultCode, intent); // the image picker callback if (requestCode == PICTURE_CHOOSE) { if (intent != null) { // Log.d(TAG, "idButSelPic Photopicker: " + // intent.getDataString()); Cursor cursor = getContentResolver().query(intent.getData(), null, null, null, null); cursor.moveToFirst(); int idx = cursor.getColumnIndex(ImageColumns.DATA); String fileSrc = cursor.getString(idx); // Log.d(TAG, "Picture:" + fileSrc); // just read size Options options = new Options(); options.inJustDecodeBounds = true; bitmapPhoto = BitmapFactory.decodeFile(fileSrc, options); // scale size to read options.inSampleSize = Math.max(1, (int) Math.ceil(Math.max( (double) options.outWidth / 1024f, (double) options.outHeight / 1024f))); options.inJustDecodeBounds = false; bitmapPhoto = BitmapFactory.decodeFile(fileSrc, options); textState.setText("Clik Detect. ==>"); imagePhoto.setImageBitmap(bitmapPhoto); buttonDetect.setVisibility(View.VISIBLE); } else { Log.d(TAG, "idButSelPic Photopicker canceled"); } } } private class FaceppDetect { DetectCallback callback = null; public void setDetectCallback(DetectCallback detectCallback) { callback = detectCallback; } public void detect(final Bitmap image) { new Thread(new Runnable() { public void run() { // zj: old position } }).start(); } } interface DetectCallback { void detectResult(JSONObject rst); }} 1 0
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