Android 人脸识别

res = FSDK.CreateTracker(mDraw.mTracker);

if (FSDK.FSDKE_OK != res) {

showErrorAndClose(“Error creating tracker”, res);

}

}

resetTrackerParameters();

this.getWindow().setBackgroundDrawable(new ColorDrawable()); //black background

setContentView(mPreview); //creates MainActivity contents

addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

// Menu

LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View buttons = inflater.inflate(R.layout.bottom_menu, null);

buttons.findViewById(R.id.helpButton).setOnClickListener(this);

buttons.findViewById(R.id.clearButton).setOnClickListener(this);

addContentView(buttons, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

}

}

@Override

public void onClick(View view) {

if (view.getId() == R.id.helpButton) {

showMessage(help_text);

} else if (view.getId() == R.id.clearButton) {

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setMessage(“Are you sure to clear the memory?”)

.setPositiveButton(“Ok”, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialogInterface, int j) {

pauseProcessingFrames();

FSDK.ClearTracker(mDraw.mTracker);

resetTrackerParameters();

resumeProcessingFrames();

}

})

.setNegativeButton(“Cancel”, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialogInterface, int j) {

}

})

.setCancelable(false) // cancel with button only

.show();

}

}

@Override

public void onPause() {

super.onPause();

pauseProcessingFrames();

String templatePath = this.getApplicationInfo().dataDir + “/” + database;

FSDK.SaveTrackerMemoryToFile(mDraw.mTracker, templatePath);

}

@Override

public void onResume() {

super.onResume();

if (mIsFailed)

return;

resumeProcessingFrames();

}

private void pauseProcessingFrames() {

mDraw.mStopping = 1;

// It is essential to limit wait time, because mStopped will not be set to 0, if no frames are feeded to mDraw

for (int i = 0; i < 100; ++i) {

if (mDraw.mStopped != 0) break;

try {

Thread.sleep(10);

} catch (Exception ex) {

}

}

}

private void resumeProcessingFrames() {

mDraw.mStopped = 0;

mDraw.mStopping = 0;

}

}

class FaceRectangle {

public int x1, y1, x2, y2;

}

// Draw graphics on top of the video

class ProcessImageAndDrawResults extends View {

public HTracker mTracker;

final int MAX_FACES = 5;

final FaceRectangle[] mFacePositions = new FaceRectangle[MAX_FACES];

final long[] mIDs = new long[MAX_FACES];

final Lock faceLock = new ReentrantLock();

int mTouchedIndex;

long mTouchedID;

int mStopping;

int mStopped;

Context mContext;

Paint mPaintGreen, mPaintBlue, mPaintBlueTransparent;

byte[] mYUVData;

byte[] mRGBData;

int mImageWidth, mImageHeight;

boolean first_frame_saved;

boolean rotated;

int GetFaceFrame(FSDK.FSDK_Features Features, FaceRectangle fr) {

if (Features == null || fr == null)

return FSDK.FSDKE_INVALID_ARGUMENT;

float u1 = Features.features[0].x;

float v1 = Features.features[0].y;

float u2 = Features.features[1].x;

float v2 = Features.features[1].y;

float xc = (u1 + u2) / 2;

float yc = (v1 + v2) / 2;

int w = (int) Math.pow((u2 - u1) * (u2 - u1) + (v2 - v1) * (v2 - v1), 0.5);

fr.x1 = (int) (xc - w * 1.6 * 0.9);

fr.y1 = (int) (yc - w * 1.1 * 0.9);

fr.x2 = (int) (xc + w * 1.6 * 0.9);

fr.y2 = (int) (yc + w * 2.1 * 0.9);

if (fr.x2 - fr.x1 > fr.y2 - fr.y1) {

fr.x2 = fr.x1 + fr.y2 - fr.y1;

} else {

fr.y2 = fr.y1 + fr.x2 - fr.x1;

}

return 0;

}

public ProcessImageAndDrawResults(Context context) {

super(context);

mTouchedIndex = -1;

mStopping = 0;

mStopped = 0;

rotated = false;

mContext = context;

mPaintGreen = new Paint();

mPaintGreen.setStyle(Paint.Style.FILL);

mPaintGreen.setColor(Color.GREEN);

mPaintGreen.setTextSize(18 * MainActivity.sDensity);

mPaintGreen.setTextAlign(Align.CENTER);

mPaintBlue = new Paint();

mPaintBlue.setStyle(Paint.Style.FILL);

mPaintBlue.setColor(Color.BLUE);

mPaintBlue.setTextSize(18 * MainActivity.sDensity);

mPaintBlue.setTextAlign(Align.CENTER);

mPaintBlueTransparent = new Paint();

mPaintBlueTransparent.setStyle(Paint.Style.STROKE);

mPaintBlueTransparent.setStrokeWidth(2);

mPaintBlueTransparent.setColor(Color.BLUE);

mPaintBlueTransparent.setTextSize(25);

//mBitmap = null;

mYUVData = null;

mRGBData = null;

first_frame_saved = false;

}

@Override

protected void onDraw(Canvas canvas) {

if (mStopping == 1) {

mStopped = 1;

super.onDraw(canvas);

return;

}

if (mYUVData == null || mTouchedIndex != -1) {

super.onDraw(canvas);

return; //nothing to process or name is being entered now

}

int canvasWidth = canvas.getWidth();

//int canvasHeight = canvas.getHeight();

// Convert from YUV to RGB

decodeYUV420SP(mRGBData, mYUVData, mImageWidth, mImageHeight);

// Load image to FaceSDK

FSDK.HImage Image = new FSDK.HImage();

FSDK.FSDK_IMAGEMODE imagemode = new FSDK.FSDK_IMAGEMODE();

imagemode.mode = FSDK.FSDK_IMAGEMODE.FSDK_IMAGE_COLOR_24BIT;

FSDK.LoadImageFromBuffer(Image, mRGBData, mImageWidth, mImageHeight, mImageWidth * 3, imagemode);

FSDK.MirrorImage(Image, false);

FSDK.HImage RotatedImage = new FSDK.HImage();

FSDK.CreateEmptyImage(RotatedImage);

//it is necessary to work with local variables (onDraw called not the time when mImageWidth,… being reassigned, so swapping mImageWidth and mImageHeight may be not safe)

int ImageWidth = mImageWidth;

//int ImageHeight = mImageHeight;

if (rotated) {

ImageWidth = mImageHeight;

//ImageHeight = mImageWidth;

FSDK.RotateImage90(Image, -1, RotatedImage);

} else {

FSDK.CopyImage(Image, RotatedImage);

}

FSDK.FreeImage(Image);

// Save first frame to gallery to debug (e.g. rotation angle)

/*

if (!first_frame_saved) {

first_frame_saved = true;

String galleryPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath();

FSDK.SaveImageToFile(RotatedImage, galleryPath + “/first_frame.jpg”); //frame is rotated!

}

*/

long IDs[] = new long[MAX_FACES];

long face_count[] = new long[1];

FSDK.FeedFrame(mTracker, 0, RotatedImage, face_count, IDs);

FSDK.FreeImage(RotatedImage);

faceLock.lock();

for (int i = 0; i < MAX_FACES; ++i) {

mFacePositions[i] = new FaceRectangle();

mFacePositions[i].x1 = 0;

mFacePositions[i].y1 = 0;

mFacePositions[i].x2 = 0;

mFacePositions[i].y2 = 0;

mIDs[i] = IDs[i];

}

float ratio = (canvasWidth * 1.0f) / ImageWidth;

for (int i = 0; i < (int) face_count[0]; ++i) {

FSDK.FSDK_Features Eyes = new FSDK.FSDK_Features();

FSDK.GetTrackerEyes(mTracker, 0, mIDs[i], Eyes);

GetFaceFrame(Eyes, mFacePositions[i]);

mFacePositions[i].x1 *= ratio;

mFacePositions[i].y1 *= ratio;

mFacePositions[i].x2 *= ratio;

mFacePositions[i].y2 *= ratio;

}

faceLock.unlock();

int shift = (int) (22 * MainActivity.sDensity);

// Mark and name faces

for (int i = 0; i < face_count[0]; ++i) {

canvas.drawRect(mFacePositions[i].x1, mFacePositions[i].y1, mFacePositions[i].x2, mFacePositions[i].y2, mPaintBlueTransparent);

boolean named = false;

if (IDs[i] != -1) {

String names[] = new String[1];

FSDK.GetAllNames(mTracker, IDs[i], names, 1024);

if (names[0] != null && names[0].length() > 0) {

canvas.drawText(names[0], (mFacePositions[i].x1 + mFacePositions[i].x2) / 2, mFacePositions[i].y2 + shift, mPaintBlue);

named = true;

}

}

if (!named) {

canvas.drawText(“Tap to name”, (mFacePositions[i].x1 + mFacePositions[i].x2) / 2, mFacePositions[i].y2 + shift, mPaintGreen);

}

}

super.onDraw(canvas);

} // end onDraw method

@Override

public boolean onTouchEvent(MotionEvent event) { //NOTE: the method can be implemented in Preview class

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

int x = (int) event.getX();

int y = (int) event.getY();

faceLock.lock();

FaceRectangle rects[] = new FaceRectangle[MAX_FACES];

long IDs[] = new long[MAX_FACES];

for (int i = 0; i < MAX_FACES; ++i) {

rects[i] = new FaceRectangle();

rects[i].x1 = mFacePositions[i].x1;

rects[i].y1 = mFacePositions[i].y1;

rects[i].x2 = mFacePositions[i].x2;

rects[i].y2 = mFacePositions[i].y2;

IDs[i] = mIDs[i];

}

faceLock.unlock();

for (int i = 0; i < MAX_FACES; ++i) {

if (rects[i] != null && rects[i].x1 <= x && x <= rects[i].x2 && rects[i].y1 <= y && y <= rects[i].y2 + 30) {

mTouchedID = IDs[i];

mTouchedIndex = i;

// requesting name on tapping the face

final EditText input = new EditText(mContext);

AlertDialog.Builder builder = new AlertDialog.Builder(mContext);

builder.setMessage(“Enter person’s name”)

.setView(input)

.setPositiveButton(“Ok”, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialogInterface, int j) {

FSDK.LockID(mTracker, mTouchedID);

String userName = input.getText().toString();

FSDK.SetName(mTracker, mTouchedID, userName);

if (userName.length() <= 0)

FSDK.PurgeID(mTracker, mTouchedID);

FSDK.UnlockID(mTracker, mTouchedID);

mTouchedIndex = -1;

}

})

.setNegativeButton(“Cancel”, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialogInterface, int j) {

mTouchedIndex = -1;

}

})

.setCancelable(false) // cancel with button only

.show();

break;

}

}

}

return true;

}

static public void decodeYUV420SP(byte[] rgb, byte[] yuv420sp, int width, int height) {

final int frameSize = width * height;

int yp = 0;

for (int j = 0; j < height; j++) {

int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;

for (int i = 0; i < width; i++) {

int y = (0xff & ((int) yuv420sp[yp])) - 16;

if (y < 0) y = 0;

if ((i & 1) == 0) {

v = (0xff & yuv420sp[uvp++]) - 128;

u = (0xff & yuv420sp[uvp++]) - 128;

}

int y1192 = 1192 * y;

int r = (y1192 + 1634 * v);

int g = (y1192 - 833 * v - 400 * u);

int b = (y1192 + 2066 * u);

if (r < 0) r = 0;

else if (r > 262143) r = 262143;

if (g < 0) g = 0;

else if (g > 262143) g = 262143;

if (b < 0) b = 0;

else if (b > 262143) b = 262143;

rgb[3 * yp] = (byte) ((r >> 10) & 0xff);

rgb[3 * yp + 1] = (byte) ((g >> 10) & 0xff);

rgb[3 * yp + 2] = (byte) ((b >> 10) & 0xff);

++yp;

}

}

}

} // end of ProcessImageAndDrawResults class

// Show video from camera and pass frames to ProcessImageAndDraw class

class Preview extends SurfaceView implements SurfaceHolder.Callback {

Context mContext;

SurfaceHolder mHolder;

Camera mCamera;

ProcessImageAndDrawResults mDraw;

boolean mFinished;

Preview(Context context, ProcessImageAndDrawResults draw) {

super(context);

mContext = context;

mDraw = draw;

//Install a SurfaceHolder.Callback so we get notified when the underlying surface is created and destroyed.

mHolder = getHolder();

mHolder.addCallback(this);

mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

//SurfaceView callback

public void surfaceCreated(SurfaceHolder holder) {