[英]Browse Image and Face Detection
我在檢測瀏覽圖像的面部時遇到了一些問題。 我知道問題是我不知道如何應用我在導入圖像上測試的面部檢測代碼。 我正在測試的示例代碼是為本地存儲的圖像編寫的。 我相信我很親密,但你可以幫幫我嗎?
首先,我創建了一個庫方法
protected void gallery() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction("android.intent.action.GET_CONTENT");
startActivityForResult(Intent.createChooser(intent, "Choose An Image"), 1);
}
我仍在學習意圖等等,但據我所知,我需要使用意圖使用Android的圖庫,因為我使用setAction獲取內容,我也使用意圖將信息傳遞給它。 話雖如此,我試圖將意圖中的信息傳遞給uri。 所以這就是我接下來要做的。
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if(requestCode == 1 && resultCode == RESULT_OK)
{
Uri uri = intent.getData();
try {
InputStream is = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(is);
ImageView image = (ImageView)findViewById(R.id.img_view);
image.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
}
所以這對我來說是令人困惑的部分。 我猜InputStream有圖像信息嗎? 好吧,我試着在同一個try-catch中應用面部檢測代碼。 我想在完成image.setImageBitmap(位圖)之后,就是應用面部檢測的時候了。 這是面部檢測代碼。
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if(requestCode == 1 && resultCode == RESULT_OK)
{
Uri uri = intent.getData();
try {
InputStream is = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(is);
ImageView image = (ImageView)findViewById(R.id.image_view);
image.setImageBitmap(bitmap);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig=Bitmap.Config.RGB_565;
bitmap = BitmapFactory.decodeResource(getResources(), R.id.img_view, options);
imageWidth = bitmap.getWidth();
imageHeight = bitmap.getHeight();
detectedFaces = new FaceDetector.Face[NUM_FACES];
faceDetector= new FaceDetector(imageWidth, imageHeight, NUM_FACES);
NUM_FACE_DETECTED = faceDetector.findFaces(bitmap, detectedFaces);
mIL.invalidate();
} catch (Exception e) {
e.printStackTrace();
}
}
}
我不知道如何更改“mFaceBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.smilingfaces,options);” 對於本地圖像,對於我認為存儲在InputStream中的圖像(或者是它?所選圖像在哪里?)我提出了改為imageView布局的想法,因為圖像在布局中。 我不明白這一切是如何轉移和共同運作的。 無論如何,該代碼片段被認為是檢測面部。 然后onDraw()在檢測到的面周圍繪制方塊。 我不確定在哪里放,但我把它放在onActivityResult()之外
protected void onDraw(Canvas canvas) {
Paint myPaint = new Paint();
myPaint.setColor(Color.RED);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(3);
myPaint.setDither(true);
for (int count = 0; count < NUM_FACE_DETECTED; count++) {
Face face = detectedFaces[count];
PointF midPoint = new PointF();
face.getMidPoint(midPoint);
eyeDistance = face.eyesDistance();
canvas.drawRect(midPoint.x-eyeDistance, midPoint.y-eyeDistance, midPoint.x+eyeDistance, midPoint.y+eyeDistance, myPaint);
}
}
有什么建議? 我非常接近讓這個工作!
我明白你真正想要的是什么。 我會給你寫完整的代碼然后繼續。
在這段代碼中,我在布局中采用了一個imageview,兩個類,一個活動類和另一個是imageview類。
我將創建兩個按鈕,其中一個按鈕用於從圖庫中選擇圖像並顯示它(用於面部檢測)和第二個用於檢測所選圖像上的面部的按鈕。
首先是mainlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.simpleapps.facedetection.MyView
android:id="@+id/faceview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="top">
<ImageView
android:id="@+id/gallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:background="@drawable/gallery" />
<ImageView
android:id="@+id/detectf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:background="@drawable/detect" />
</LinearLayout>
</FrameLayout>
現在是活動類
MainActivity.java
public class MainActivity extends Activity {
public MyView faceview;
public static Bitmap defaultBitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_main);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
screenHeight = displaymetrics.heightPixels;
screenWidth = displaymetrics.widthPixels;
faceview = (MyView)findViewById(R.id.faceview);
myGallery = (LinearLayout)findViewById(R.id.mygallery);
gallery=(ImageView)findViewById(R.id.gallery);
detectf=(ImageView)findViewById(R.id.detectf);
BitmapFactory.Options bitmapFatoryOptions=new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig=Bitmap.Config.RGB_565;
defaultBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.face,bitmapFatoryOptions);
faceview.setImage(defaultBitmap);
gallery.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, 0 );
}
});
detectf.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
faceview.facedetect();
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if(requestCode==0){
imageURI = data.getData();
try {
BitmapFactory.Options bitmapFatoryOptions=new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig=Bitmap.Config.RGB_565;
Bitmap b =
BitmapFactory.decodeStream(getContentResolver().openInputStream(imageURI), null,
bitmapFatoryOptions);
faceview.myBitmap=b;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
faceview.invalidate();
}
faceview.invalidate();
} else {
System.exit(0);
Log.e("result", "BAD");
}
}
}
現在是視圖類。
MyView.java
public class MyView extends View {
private FaceDetector.Face[] detectedFaces;
private int NUMBER_OF_FACES=10;
private FaceDetector faceDetector;
private int NUMBER_OF_FACE_DETECTED;
private float eyeDistance;
public Paint myPaint;
public Bitmap resultBmp;
public Bitmap myBitmap,HairBitmap;
public PointF midPoint1;
public MyView(Context context, AttributeSet attrs) {
super(context,attrs);
// TODO Auto-generated constructor stub
BitmapFactory.Options bitmapFatoryOptions=new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig=Bitmap.Config.RGB_565;
}
public void setImage(Bitmap bitmap) {
myBitmap = bitmap;
invalidate();
}
public void facedetect(){
myPaint = new Paint();
myPaint.setColor(Color.GREEN);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(3);
detectedFaces=new FaceDetector.Face[NUMBER_OF_FACES];
faceDetector=new FaceDetector(resultBmp.getWidth(),resultBmp.getHeight(),NUMBER_OF_FACES);
NUMBER_OF_FACE_DETECTED=faceDetector.findFaces(resultBmp, detectedFaces);
System.out.println("faces detected are"+NUMBER_OF_FACE_DETECTED);
Canvas facec=new Canvas();
for(int count=0;count<NUMBER_OF_FACE_DETECTED;count++)
{
if(count==0){
face1=detectedFaces[count];
midPoint1=new PointF();
face1.getMidPoint(midPoint1);
eyeDistance=face1.eyesDistance();
}
}
invalidate();
if(NUMBER_OF_FACE_DETECTED==0){
Toast.makeText(getContext(), "no faces detected", Toast.LENGTH_LONG).show();
}else if(NUMBER_OF_FACE_DETECTED!=0){
Toast.makeText(getContext(), "faces detected "+NUMBER_OF_FACE_DETECTED, Toast.LENGTH_LONG).show();
}
}
protected void onDraw(Canvas canvas)
{
if(myBitmap!=null)
{
w = myBitmap.getWidth();
h = myBitmap.getHeight();
resultBmp = null;
int widthofBitMap = MainActivity.screenWidth ;
int heightofBitMap = widthofBitMap*h/w;
resultBmp = Bitmap.createScaledBitmap(myBitmap, widthofBitMap, heightofBitMap, true);
canvas.drawBitmap(resultBmp, (MainActivity.screenWidth-widthofBitMap)/2,(MainActivity.screenHeight-heightofBitMap)/2, null);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_MOVE:
x = event.getX();
y = event.getY();
break;
case MotionEvent.ACTION_DOWN:
x = event.getX();
y = event.getY();
break;
case MotionEvent.ACTION_UP:
default:
}
invalidate();
return true;
}
}
我花了一些時間來編寫這段代碼。 我希望它有所幫助。 如果你得到一些錯誤就問。
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