本文介绍了在android中使用人脸检测裁剪图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我需要一个可以使用人脸检测功能裁剪任何图像的演示.
I needed a demo where any image can be cropped with the face detection function.
已修复
但是经过几个小时的冲浪后，我一个演示都没有，所以我准备了一个演示，并结合了我在网上找到的几个演示.
But after few surfing hours I didn't come to a single demo, so I prepared a single demo with conjunction of few demos that I found online.
我已经准备了一个演示来裁剪图像.
I have prepared a demo to crop the image.
我的演示裁剪了图像矩形和圆形.
My demo crops the image rectangle, and circular as well.
它还检测人脸并根据人脸检测裁剪图像.
Also it detects the face and crops the image according to the face detection.
我正在使用下面的图片来裁剪它.
I am using the following image to crop it.
裁剪结果的截图是:
示例的xml是:
<LinearLayout 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:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity" >
<View
android:id="@+id/part1"
android:layout_width="fill_parent"
android:layout_height="100dp" >
</View>
<View
android:id="@+id/part2"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="30dp" >
</View>
</LinearLayout>
Activity的java代码:
The java code for the Activity :
public class MainActivity extends Activity {
public View part1, part2;
int viewHeight, viewWidth;
private FaceDetector myFaceDetect;
private FaceDetector.Face[] myFace;
float myEyesDistance;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
part1 = findViewById(R.id.part1);
part2 = findViewById(R.id.part2);
part1.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
viewHeight = part1.getMeasuredHeight();
viewWidth = part1.getMeasuredWidth();
try {
Paint paint = new Paint();
paint.setFilterBitmap(true);
Bitmap bitmapOrg = BitmapFactory.decodeResource(
getResources(),
R.drawable.sachin_tendulkar_10102013);
int targetWidth = bitmapOrg.getWidth();
int targetHeight = bitmapOrg.getHeight();
Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
targetHeight, Bitmap.Config.ARGB_8888);
RectF rectf = new RectF(0, 0, viewWidth, viewHeight);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addRect(rectf, Path.Direction.CW);
canvas.clipPath(path);
canvas.drawBitmap(
bitmapOrg,
new Rect(0, 0, bitmapOrg.getWidth(), bitmapOrg
.getHeight()), new Rect(0, 0, targetWidth,
targetHeight), paint);
Matrix matrix = new Matrix();
matrix.postScale(1f, 1f);
BitmapFactory.Options bitmapFatoryOptions = new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig = Bitmap.Config.RGB_565;
bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.sachin_tendulkar_10102013,
bitmapFatoryOptions);
myFace = new FaceDetector.Face[5];
myFaceDetect = new FaceDetector(targetWidth, targetHeight,
5);
int numberOfFaceDetected = myFaceDetect.findFaces(
bitmapOrg, myFace);
Bitmap resizedBitmap = null;
if (numberOfFaceDetected > 0) {
PointF myMidPoint = null;
Face face = myFace[0];
myMidPoint = new PointF();
face.getMidPoint(myMidPoint);
myEyesDistance = face.eyesDistance();
if (myMidPoint.x + viewWidth > targetWidth) {
while (myMidPoint.x + viewWidth > targetWidth) {
myMidPoint.x--;
}
}
if (myMidPoint.y + viewHeight > targetHeight) {
while (myMidPoint.y + viewHeight > targetHeight) {
myMidPoint.y--;
}
}
resizedBitmap = Bitmap.createBitmap(bitmapOrg,
(int) (myMidPoint.x - myEyesDistance),
(int) (myMidPoint.y - myEyesDistance),
viewWidth, viewHeight, matrix, true);
} else {
resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
viewWidth, viewHeight, matrix, true);
}
/* convert Bitmap to resource */
// Bitmap resizedBitmap = Bitmap.createBitmap(targetBitmap,
// 0,
// 0, viewWidth, viewHeight, matrix, true);
BitmapDrawable bd = new BitmapDrawable(resizedBitmap);
part1.setBackgroundDrawable(bd);
} catch (Exception e) {
System.out.println("Error1 : " + e.getMessage()
+ e.toString());
}
}
});
part2.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
viewHeight = part2.getMeasuredHeight();
viewWidth = part2.getMeasuredWidth();
try {
Paint paint = new Paint();
paint.setFilterBitmap(true);
Bitmap bitmapOrg = BitmapFactory.decodeResource(
getResources(),
R.drawable.sachin_tendulkar_10102013);
int targetWidth = bitmapOrg.getWidth();
int targetHeight = bitmapOrg.getHeight();
Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
targetHeight, Bitmap.Config.ARGB_8888);
RectF rectf = new RectF(0, 0, viewWidth, viewHeight);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addRect(rectf, Path.Direction.CW);
canvas.clipPath(path);
canvas.drawBitmap(
bitmapOrg,
new Rect(0, 0, bitmapOrg.getWidth(), bitmapOrg
.getHeight()), new Rect(0, 0, targetWidth,
targetHeight), paint);
Matrix matrix = new Matrix();
matrix.postScale(1f, 1f);
BitmapFactory.Options bitmapFatoryOptions = new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig = Bitmap.Config.RGB_565;
bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.sachin_tendulkar_10102013,
bitmapFatoryOptions);
myFace = new FaceDetector.Face[5];
myFaceDetect = new FaceDetector(targetWidth, targetHeight,
5);
int numberOfFaceDetected = myFaceDetect.findFaces(
bitmapOrg, myFace);
Bitmap resizedBitmap = null;
if (numberOfFaceDetected > 0) {
PointF myMidPoint = null;
Face face = myFace[0];
myMidPoint = new PointF();
face.getMidPoint(myMidPoint);
myEyesDistance = face.eyesDistance() + 20;
if (myMidPoint.x + viewWidth > targetWidth) {
while (myMidPoint.x + viewWidth > targetWidth) {
myMidPoint.x--;
}
}
if (myMidPoint.y + viewHeight > targetHeight) {
while (myMidPoint.y + viewHeight > targetHeight) {
myMidPoint.y--;
}
}
resizedBitmap = Bitmap.createBitmap(bitmapOrg,
(int) (myMidPoint.x - myEyesDistance),
(int) (myMidPoint.y - myEyesDistance),
viewWidth, viewHeight, matrix, true);
} else {
resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
viewWidth, viewHeight, matrix, true);
}
/* convert Bitmap to resource */
// Bitmap resizedBitmap = Bitmap.createBitmap(targetBitmap,
// 0,
// 0, viewWidth, viewHeight, matrix, true);
BitmapDrawable bd = new BitmapDrawable(resizedBitmap);
part2.setBackgroundDrawable(new BitmapDrawable(
getCroppedBitmap(bd.getBitmap())));
} catch (Exception e) {
System.out.println("Error1 : " + e.getMessage()
+ e.toString());
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public Bitmap getCroppedBitmap(Bitmap bitmap) {
// Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
// bitmap.getHeight(), Config.ARGB_8888);
// Canvas canvas = new Canvas(output);
//
// final int color = 0xff424242;
// final Paint paint = new Paint();
// final Rect rect = new Rect(0, 0, bitmap.getWidth(),
// bitmap.getHeight());
//
// paint.setAntiAlias(true);
// canvas.drawARGB(0, 0, 0, 0);
// paint.setColor(color);
// // canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
// canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
// bitmap.getWidth() / 2, paint);
// paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
// canvas.drawBitmap(bitmap, rect, rect, paint);
// // Bitmap _bmp = Bitmap.createScaledBitmap(output, 60, 60, false);
// // return _bmp;
// return output;
int targetWidth = bitmap.getWidth();
int targetHeight = bitmap.getHeight();
Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, targetHeight,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addCircle(((float) targetWidth - 1) / 2,
((float) targetHeight - 1) / 2,
(Math.min(((float) targetWidth), ((float) targetHeight)) / 2),
Path.Direction.CCW);
canvas.clipPath(path);
Bitmap sourceBitmap = bitmap;
canvas.drawBitmap(sourceBitmap, new Rect(0, 0, sourceBitmap.getWidth(),
sourceBitmap.getHeight()), new Rect(0, 0, targetWidth,
targetHeight), null);
return targetBitmap;
}
}
推荐答案
该演示适用于drawable文件夹中的任何图像，
The demo works for any image put in the drawable folder,
但是，如果您想裁剪任何动态图像，例如从图库中下载或选择的任何图像，只需对代码进行一些更改:
But if you want to crop any dynamic image, for example any image which is downloaded or chosen from gallery, make few changes in the code :
看线:
Bitmap bitmapOrg = BitmapFactory.decodeResource(
getResources(),
R.drawable.sachin_tendulkar_10102013);
这里我从可绘制文件夹中获取图像，现在对于任何下载的图像，您只需将该图像保存在 bitmapOrg 变量中，因此只需将上面的行更改两次，part1 用于矩形，part2 用于 ciculart将下载的图片作为位图保存到 bitmapOrg，并使用演示，它将以矩形和圆形方式裁剪您的图像.
Here I am taking the image from the drawable folder, now for any downloaded image, you just need to save that image in the bitmapOrg variable, so just change the above line twice, one for part1 for rectangle and part2 for ciculart with your downloaded image saving to bitmapOrg as bitmap, and use the demo, it will crop your image in rectangle and circular way.
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