Hi zdenko! Thank you for the reply! It is in Bitmap object. I've uploaded a
text file of my code to let you see what is the logical error is. I quite
in the edge now. xD
On Monday, April 17, 2017 at 4:13:45 PM UTC+8, zdenop wrote:
>
> Is image (in "mTess.setImage(image)" pix object?
>
> Zdenko
>
> On Mon, Apr 17, 2017 at 7:56 AM, NewbProgrammer <[email protected]
> <javascript:>> wrote:
>
>> I am currently developing an app in android studio. It seems that my app
>> is crashing at "mTess.setImage(image)" I don't know why and I'm still
>> learning. Can anyone help me? Btw, the image that was set was taken from a
>> camera and the will be cropped out. After cropping it out the image will be
>> convert into greyscaled image and then binary image to increase accuracy of
>> tesseract.
>>
>> The reason why I said that the error was in mTess.setImage() was because
>> everytime I comment it out the app runs fine without saying "unfortunately
>> blah blah", so there is where I get my basis from. :/
>>
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import android.content.Intent;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.googlecode.tesseract.android.TessBaseAPI;
import org.w3c.dom.Text;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainActivity extends AppCompatActivity {
private TessBaseAPI mTess;
private String datapath = "";
private Uri picUri;
Button button;
ImageView imageView;
TextView textView;
private String storageDir = Environment.getExternalStorageDirectory() +
"/LPAMSolver";
static final int CAM_REQUEST = 1;
static final int CROP_PIC = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
imageView = (ImageView) findViewById(R.id.imageView);
textView = (TextView) findViewById(R.id.textView);
//initialize Tesseract API
String language = "amh";
datapath = getFilesDir() + "assets/";
mTess = new TessBaseAPI();
checkFile(new File(datapath + "tessdata/"));
mTess.init(datapath, language);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent camera_intent = new
Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = getFile();
picUri = Uri.fromFile(file);
camera_intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(file));
startActivityForResult(camera_intent, CAM_REQUEST);
}
});
}
//to check traindata if existing
private void checkFile(File dir) {
if (!dir.exists() && dir.mkdirs()) {
copyFiles();
}
if (dir.exists()) {
String datafilepath = datapath + "/tessdata/amh.traineddata";
File datafile = new File(datafilepath);
if (!datafile.exists()) {
copyFiles();
}
}
}
//to initialize tesseract traindata
private void copyFiles() {
try {
String filepath = datapath + "/tessdata/amh.traineddata";
AssetManager assetManager = getAssets();
InputStream instream =
assetManager.open("tessdata/amh.traineddata");
OutputStream outstream = new FileOutputStream(filepath);
byte[] buffer = new byte[1024];
int read;
while ((read = instream.read(buffer)) != -1) {
outstream.write(buffer, 0, read);
}
outstream.flush();
outstream.close();
instream.close();
File file = new File(filepath);
if (!file.exists()) {
throw new FileNotFoundException();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//to create directory for the application and make image file
private File getFile() {
File folder = new File(Environment.getExternalStorageDirectory() +
"/LPAMSolver");
if (!folder.exists()) {
folder.mkdir();
}
File image_file = new File(folder, "cam_image.png");
return image_file;
}
//transform image to grayscale
private Bitmap getGrayscale(Bitmap src){
//Custom color matrix to convert to GrayScale
float[] matrix = new float[]{
0.3f, 0.59f, 0.11f, 0, 0,
0.3f, 0.59f, 0.11f, 0, 0,
0.3f, 0.59f, 0.11f, 0, 0,
0, 0, 0, 1, 0,};
Bitmap dest = Bitmap.createBitmap(
src.getWidth(),
src.getHeight(),
src.getConfig());
Canvas canvas = new Canvas(dest);
Paint paint = new Paint();
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
paint.setColorFilter(filter);
canvas.drawBitmap(src, 0, 0, paint);
return dest;
}
//transform image to binary from grayscale
public Bitmap getBinary(Bitmap bmpOriginal) {
int width, height, threshold;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
threshold = 100;
Bitmap bmpBinary = Bitmap.createBitmap(bmpOriginal);
for(int x = 0; x < width; ++x) {
for(int y = 0; y < height; ++y) {
// get one pixel color
int pixel = bmpOriginal.getPixel(x, y);
int red = Color.red(pixel);
int green = Color.green(pixel);
int blue = Color.blue(pixel);
//get grayscale value
int gray = (int)(red * 0.3 + green * 0.59 + blue *0.11);
//get binary value
if(gray < threshold){
bmpBinary.setPixel(x, y, 0xFF000000);
} else{
bmpBinary.setPixel(x, y, 0xFFFFFFFF);
}
}
}
return bmpBinary;
}
//calls the intent for crop
public void crop(){
Intent CropIntent = new Intent("com.android.camera.action.CROP");
File file = getFile();
picUri = Uri.fromFile(file);
CropIntent.setDataAndType(picUri, "image/*");
CropIntent.putExtra("crop", "true");
CropIntent.putExtra("outputX", 200);
CropIntent.putExtra("outputY", 200);
CropIntent.putExtra("aspectX", 0);
CropIntent.putExtra("aspectY", 0);
CropIntent.putExtra("scaleUpIfNeeded", true);
CropIntent.putExtra("return-data", true);
CropIntent.putExtra(MediaStore.EXTRA_OUTPUT, picUri);
startActivityForResult(CropIntent, CROP_PIC);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent
data) {
if (requestCode == CAM_REQUEST) {
crop();
}
if (requestCode == CROP_PIC){
Bundle extras = data.getExtras();
Bitmap selectedBitmap = extras.getParcelable("data");
Bitmap convertedimage = getBinary(getGrayscale(selectedBitmap));
String OCRresult = "";
mTess.setImage(convertedimage);
OCRresult = mTess.getUTF8Text();
textView.setText(OCRresult);
imageView.setImageBitmap(convertedimage);
Intent intent = new
Intent(getApplicationContext(),Main2Activity.class);
intent.putExtra("OCRresult",OCRresult);
intent.putExtra("convertedimage",convertedimage);
startActivity(intent);
}
}
}
