试图为我们的论文项目创建一个基于Android的ANPR，但存在字符分割和字符识别问题。这是我第一次处理ANPR，Android和eclipse。我一点都不知道我取得的进步只是自学成才。我尝试了一切，但我认为这是我的极限。试图进行一些研究，但大多数都使用Tesseract-ocr，我们不允许使用它。我正在使用eclipse-kepler作为我的IDE。非常感谢您的帮助。谢谢！ 这是我的代码：
package com.example.camera2;
//java imports
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
//opencv imports
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;
//android imports
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
private static final String TAG = "Browse Pics";
protected static final int CAMERA_PIC_REQUEST = 0;
private static final int SELECTED_PICTURE = 1;
private OnClickListener ocl;
private Button capture, browse;
private ImageView iv;
private Bitmap bmpClone;
public static int threshold = 185;
Mat maskrgb;
static
{
if (OpenCVLoader.initDebug())
{
Log.i(TAG, "OK");
System.loadLibrary("opencv_java");
}else{
Log.i(TAG, "Error encountered");
}
}
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this){
@Override
public void onManagerConnected(int status) {
// TODO Auto-generated method stub
switch(status){
case LoaderCallbackInterface.SUCCESS:{
Log.i(TAG, "OpenCV loaded successfully");
break;
}
default:
{
super.onManagerConnected(status);
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_13, this, mLoaderCallback))
{
Log.e(TAG, "Cannot connect to OpenCV Manager");
}else{
Log.i(TAG, "OpenCV successful");
setContentView(R.layout.activity_main);
browse = (Button)this.findViewById(R.id.button1);
capture = (Button)this.findViewById(R.id.button2);
iv = (ImageView)this.findViewById(R.id.imageView1);
ocl = new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == browse.getId()){ //when browse button is clicked
iv.setImageBitmap(null);
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, SELECTED_PICTURE);
}
else if(v.getId() == capture.getId()){ //when capture button is clicked
ImageView imageview = (ImageView) findViewById(R.id.imageView1);
imageview.setImageBitmap(null);
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
}
};
browse.setOnClickListener(ocl);
capture.setOnClickListener(ocl);
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode){
case SELECTED_PICTURE: //browse from gallery
if(resultCode == RESULT_OK && null != data){
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
Bitmap temp = BitmapFactory.decodeFile(picturePath, options);
Bitmap currentBitmap = temp.copy(Bitmap.Config.ARGB_8888, false); //original bitmap
if(currentBitmap.getWidth() > 450 && currentBitmap.getHeight() > 550){
Bitmap resizeBmp = Bitmap.createScaledBitmap(currentBitmap, 450, 550, false);
new MyTask(resizeBmp, MainActivity.this).execute();
iv.setImageBitmap(resizeBmp);
}else{
new MyTask(currentBitmap, MainActivity.this).execute();
iv.setImageBitmap(currentBitmap);
}
}
break;
case CAMERA_PIC_REQUEST: //use camera
if(resultCode == RESULT_OK){
Bitmap photo = (Bitmap) data.getExtras().get("data");
if(photo.getWidth() > 600 && photo.getHeight() > 600){
Bitmap resizeBmp = Bitmap.createScaledBitmap(photo, 450, 550, false);
new MyTask(resizeBmp, MainActivity.this).execute();
iv.setImageBitmap(resizeBmp);
}else{
new MyTask(photo, MainActivity.this).execute();
iv.setImageBitmap(photo);
}
}
break;
}
}
/*@Override
public void onWindowFocusChanged(boolean hasFocus){
ivWidth=iv.getWidth();
ivHeight=iv.getHeight();
}*/
/* private static Bitmap makeBlackTransparent(Bitmap image) {
// convert image to matrix
Mat src = new Mat(image.getWidth(), image.getHeight(), CvType.CV_8UC4);
Utils.bitmapToMat(image, src);
// init new matrices
Mat dst = new Mat(image.getWidth(), image.getHeight(), CvType.CV_8UC4);
Mat tmp = new Mat(image.getWidth(), image.getHeight(), CvType.CV_8UC4);
Mat alpha = new Mat(image.getWidth(), image.getHeight(), CvType.CV_8UC4);
// convert image to grayscale
Imgproc.cvtColor(src, tmp, Imgproc.COLOR_BGR2GRAY);
// threshold the image to create alpha channel with complete transparency in black background region and zero transparency in foreground object region.
Imgproc.threshold(tmp, alpha, 100, 255, Imgproc.THRESH_BINARY);
// split the original image into three single channel.
List<Mat> rgb = new ArrayList<Mat>(3);
Core.split(src, rgb);
// Create the final result by merging three single channel and alpha(BGRA order)
List<Mat> rgba = new ArrayList<Mat>(4);
rgba.add(rgb.get(0));
rgba.add(rgb.get(1));
rgba.add(rgb.get(2));
rgba.add(alpha);
Core.merge(rgba, dst);
// convert matrix to output bitmap
Bitmap output = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(dst, output);
dst.release();
tmp.release();
alpha.release();
src.release();
return output;
}
*/
public void debugger(String s){
Log.v("","########### "+s);
}
//loading process
private class MyTask extends AsyncTask<Void, Bitmap, Bitmap> {
Context context;
ProgressDialog ringDialog;
Bitmap bmp;
public MyTask(Bitmap bmp, Context con){
super();
this.bmp = bmp;
context = con;
}
@Override
protected void onPreExecute() {
ringDialog = ProgressDialog.show(context, "Please wait...", "Removing background...");
ringDialog.setCancelable(true);
}
@Override
protected Bitmap doInBackground(Void... v) {
// TODO Auto-generated method stub
//calling the grabcut
bmp = toGrayscale(bmp);
bmp = grabCut(bmp);
bmp = toThreshold(bmp, threshold);
return bmp;
}
@Override
protected void onPostExecute(Bitmap bmp) {
//super.onPostExecute(bmp);
ringDialog.dismiss();
iv.setImageBitmap(bmp);
//put here the process you want after the grabCut algorithm
}
//GrabCut Algorithm
public Bitmap grabCut(Bitmap bm){
Bitmap tempBitmap = bm.copy(Bitmap.Config.ARGB_8888, true);
Mat img = new Mat(tempBitmap.getHeight(), tempBitmap.getWidth(), CvType.CV_8U);
Utils.bitmapToMat(bm, img);
int r = img.rows();
int c = img.cols();
Point p1 = new Point(c/12, r/12);
Point p2 = new Point(c-c/12, r-r/12);
Rect rect = new Rect(p1, p2);
Mat mask = new Mat();
debugger(""+mask.type());
mask.setTo(new Scalar(125));
Mat fgdModel = new Mat();
fgdModel.setTo(new Scalar(255, 255, 255));
Mat bgdModel = new Mat();
bgdModel.setTo(new Scalar(255, 255, 255));
Mat imgC3 = new Mat();
Imgproc.cvtColor(img, imgC3, Imgproc.COLOR_RGBA2RGB);
Log.d("Grabcut", "Grabcut begins");
Imgproc.grabCut(imgC3, mask, rect, bgdModel, fgdModel, 5, Imgproc.GC_INIT_WITH_RECT);
Mat source = new Mat(1, 1, CvType.CV_8U, new Scalar(3.0));
Core.compare(mask, source, mask, Core.CMP_EQ);
Mat foreground = new Mat(img.size(), CvType.CV_8UC3, new Scalar(255, 255, 255));
img.copyTo(foreground, mask);
Log.d("Grab Cut", "Convert to Bitmap");
Utils.matToBitmap(foreground, tempBitmap);
img.release();
imgC3.release();
mask.release();
fgdModel.release();
bgdModel.release();
return tempBitmap;
}
}
private static ColorMatrix createGreyMatrix(){
ColorMatrix matrix = new ColorMatrix(new float[] {
0.2989f, 0.5870f, 0.1140f, 0, 0,
0.2989f, 0.5870f, 0.1140f, 0, 0,
0.2989f, 0.5870f, 0.1140f, 0, 0,
0, 0, 0, 1, 0
});
return matrix;
}
private static ColorMatrix createThresholdMatrix(int threshold) {
ColorMatrix matrix = new ColorMatrix(new float[] {
85.f, 85.f, 85.f, 0.f, -255.f * threshold,
85.f, 85.f, 85.f, 0.f, -255.f * threshold,
85.f, 85.f, 85.f, 0.f, -255.f * threshold,
0f, 0f, 0f, 1f, 0f
});
return matrix;
}
public Bitmap toGrayscale(Bitmap bmp) {
int width, height;
height = bmp.getHeight();
width = bmp.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(createGreyMatrix());
paint.setColorFilter(f);
c.drawBitmap(bmp, 0, 0, paint);
return bmpGrayscale;
}
public Bitmap toThreshold(Bitmap bmp, int threshold) {
int width, height;
height = bmp.getHeight();
width = bmp.getWidth();
Bitmap bmpThreshold = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bmpThreshold);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(createThresholdMatrix(threshold));
paint.setColorFilter(f);
c.drawBitmap(bmp, 0, 0, paint);
return bmpThreshold;
}
}