1 | initial version |
I imrove @sturkmen' s code.
fragment_main.xml
<FrameLayout 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"
tools:context="{your package name}.FragmentMain">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnCamera"
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="Kamera" />
<Button
android:id="@+id/btnTest"
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="Test" />
<ImageView
android:id="@+id/sampleImageView"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_centerHorizontal="true"/>
</LinearLayout>
</framelayout>
AndroidManifest.xml
Add this line for write permission.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
FragmentMain.java
IMAGE FILE: Add Internal Storage / Android / Data / Your Package Folder / test.JPG
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View _view = inflater.inflate(R.layout.fragment_main, container, false);
Button btnTest = (Button) _view.findViewById(R.id.btnTest);
btnTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Mat img = Imgcodecs.imread(mediaStorageDir().getPath() + "/" + "test.JPG");
if (img.empty()) {
Log.d("FragmentMain", "Empty Image");
}
Size dims = new Size (20,5);
Mat gray = new Mat();
Mat thresh = new Mat();
//convert the image to black and white
Imgproc.cvtColor(img, gray, Imgproc.COLOR_BGR2GRAY);
storeImage(gray);
//convert the image to black and white does (8 bit)
Imgproc.threshold(gray, thresh, 0, 255, Imgproc.THRESH_BINARY_INV + Imgproc.THRESH_OTSU);
storeImage(thresh);
Mat temp = thresh.clone();
//find the contours
Mat hierarchy = new Mat();
Mat corners = new Mat(4,1, CvType.CV_32FC2);
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Imgproc.findContours(temp, contours,hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
hierarchy.release();
for (int idx = 0; idx < contours.size(); idx++)
{
MatOfPoint contour = contours.get(idx);
MatOfPoint2f contour_points = new MatOfPoint2f(contour.toArray());
RotatedRect minRect = Imgproc.minAreaRect( contour_points );
Point[] rect_points = new Point[4];
minRect.points( rect_points );
if(minRect.size.height > img.width() / 2)
{
List<Point> srcPoints = new ArrayList<Point>(4);
srcPoints.add(rect_points[2]);
srcPoints.add(rect_points[3]);
srcPoints.add(rect_points[0]);
srcPoints.add(rect_points[1]);
corners = Converters.vector_Point_to_Mat(
srcPoints, CvType.CV_32F);
}
}
Imgproc.erode(thresh, thresh, new Mat(), new Point(-1,-1), 10);
storeImage(thresh);
Imgproc.dilate(thresh, thresh, new Mat(), new Point(-1,-1), 5);
storeImage(thresh);
Mat results = new Mat(1000,250,CvType.CV_8UC3);
Mat quad = new Mat(1000,250,CvType.CV_8UC1);
List<Point> dstPoints = new ArrayList<Point>(4);
dstPoints.add(new Point(0, 0));
dstPoints.add(new Point(1000, 0));
dstPoints.add(new Point(1000, 250));
dstPoints.add(new Point(0, 250));
Mat quad_pts = Converters.vector_Point_to_Mat(
dstPoints, CvType.CV_32F);
Mat transmtx = Imgproc.getPerspectiveTransform(corners, quad_pts);
Imgproc.warpPerspective( img, results, transmtx, new Size(1000,250));
Imgproc.warpPerspective( thresh, quad, transmtx, new Size(1000,250));
Imgproc.resize(quad, quad, new Size(20,5));
Imgcodecs.imwrite("results.png",quad);
//store image
storeImage(quad);
//show image
showImage(quad);
System.out.println( quad.dump() );
for(int i = 0; i < quad.cols(); i++)
{
int size = (int) (quad.total() * quad.channels());
byte[] tmp = new byte[size];
String answer = "";
double[] d = new double[0];
d = quad.get(1, i);
answer += d[0] == 0 ? "" : "A";
d = quad.get(2, i);
answer += d[0] == 0 ? "" : "B";
d = quad.get(3, i);
answer += d[0] == 0 ? "" : "C";
d = quad.get(4, i);
answer += d[0] == 0 ? "" : "D";
if( answer.length() > 1 ) answer = "X"; // Double mark
int y = 0;
if( answer.equals("A")) y = results.rows() / (int) dims.height;
if( answer.equals("B")) y = results.rows() / (int) dims.height *2;
if( answer.equals("C")) y = results.rows() / (int) dims.height *3;
if( answer.equals("D")) y = results.rows() / (int) dims.height *4;
if( answer == "" ) answer = "[-]";
Imgproc.putText( results, answer, new Point( 50* i + 15, 30 + y), Core.FONT_HERSHEY_PLAIN, 2, new Scalar(0,0,255),2);
}
//store image
storeImage(results);
//show image
showImage(results);
}
});
public void showImage (Mat img) {
ImageView imgView = (ImageView) getActivity().findViewById(R.id.sampleImageView);
//Mat mRgba = new Mat();
//mRgba = Utils.loadResource(MainAct.this, R.drawable.your_image,Highgui.CV_LOAD_IMAGE_COLOR);
Bitmap img2 = Bitmap.createBitmap(img.cols(), img.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(img, img2);
imgView.setImageBitmap(img2);
}
public File mediaStorageDir () {
File _mediaStorageDir = new File(Environment.getExternalStorageDirectory()
+ "/Android/data/"
+ getActivity().getApplicationContext().getPackageName());
return _mediaStorageDir;
}
public void storeImage(Mat matImg) {
Bitmap bitmapImg = Bitmap.createBitmap(matImg.cols(), matImg.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(matImg, bitmapImg);
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date());
File mediaFile;
String mImageName="IMG_"+ timeStamp +".jpg";
mediaFile = new File(mediaStorageDir().getPath() + File.separator + mImageName);
File pictureFile = mediaFile;
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
bitmapImg.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.close();
} catch (FileNotFoundException e) {
Log.d("FragmentMain", "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d("FragmentMain", "Error accessing file: " + e.getMessage());
}
}
2 | No.2 Revision |
I imrove @sturkmen' s code.
fragment_main.xml
<FrameLayout 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"
tools:context="{your package name}.FragmentMain">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnCamera"
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="Kamera" />
<Button
android:id="@+id/btnTest"
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="Test" />
<ImageView
android:id="@+id/sampleImageView"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_centerHorizontal="true"/>
</LinearLayout>
</framelayout>
AndroidManifest.xml
Add this line for write permission.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
FragmentMain.java
IMAGE FILE: Add Internal Storage / Android / Data / Your Package Folder / test.JPG
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View _view = inflater.inflate(R.layout.fragment_main, container, false);
Button btnTest = (Button) _view.findViewById(R.id.btnTest);
btnTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Mat img = Imgcodecs.imread(mediaStorageDir().getPath() + "/" + "test.JPG");
if (img.empty()) {
Log.d("FragmentMain", "Empty Image");
}
Size dims = new Size (20,5);
Mat gray = new Mat();
Mat thresh = new Mat();
//convert the image to black and white
Imgproc.cvtColor(img, gray, Imgproc.COLOR_BGR2GRAY);
storeImage(gray);
//convert the image to black and white does (8 bit)
Imgproc.threshold(gray, thresh, 0, 255, Imgproc.THRESH_BINARY_INV + Imgproc.THRESH_OTSU);
storeImage(thresh);
Mat temp = thresh.clone();
//find the contours
Mat hierarchy = new Mat();
Mat corners = new Mat(4,1, CvType.CV_32FC2);
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Imgproc.findContours(temp, contours,hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
hierarchy.release();
for (int idx = 0; idx < contours.size(); idx++)
{
MatOfPoint contour = contours.get(idx);
MatOfPoint2f contour_points = new MatOfPoint2f(contour.toArray());
RotatedRect minRect = Imgproc.minAreaRect( contour_points );
Point[] rect_points = new Point[4];
minRect.points( rect_points );
if(minRect.size.height > img.width() / 2)
{
List<Point> srcPoints = new ArrayList<Point>(4);
srcPoints.add(rect_points[2]);
srcPoints.add(rect_points[3]);
srcPoints.add(rect_points[0]);
srcPoints.add(rect_points[1]);
corners = Converters.vector_Point_to_Mat(
srcPoints, CvType.CV_32F);
}
}
Imgproc.erode(thresh, thresh, new Mat(), new Point(-1,-1), 10);
storeImage(thresh);
Imgproc.dilate(thresh, thresh, new Mat(), new Point(-1,-1), 5);
storeImage(thresh);
Mat results = new Mat(1000,250,CvType.CV_8UC3);
Mat quad = new Mat(1000,250,CvType.CV_8UC1);
List<Point> dstPoints = new ArrayList<Point>(4);
dstPoints.add(new Point(0, 0));
dstPoints.add(new Point(1000, 0));
dstPoints.add(new Point(1000, 250));
dstPoints.add(new Point(0, 250));
Mat quad_pts = Converters.vector_Point_to_Mat(
dstPoints, CvType.CV_32F);
Mat transmtx = Imgproc.getPerspectiveTransform(corners, quad_pts);
Imgproc.warpPerspective( img, results, transmtx, new Size(1000,250));
Imgproc.warpPerspective( thresh, quad, transmtx, new Size(1000,250));
Imgproc.resize(quad, quad, new Size(20,5));
Imgcodecs.imwrite("results.png",quad);
//store image
storeImage(quad);
//show image
showImage(quad);
System.out.println( quad.dump() );
for(int i = 0; i < quad.cols(); i++)
{
int size = (int) (quad.total() * quad.channels());
byte[] tmp = new byte[size];
String answer = "";
double[] d = new double[0];
d = quad.get(1, i);
answer += d[0] == 0 ? "" : "A";
d = quad.get(2, i);
answer += d[0] == 0 ? "" : "B";
d = quad.get(3, i);
answer += d[0] == 0 ? "" : "C";
d = quad.get(4, i);
answer += d[0] == 0 ? "" : "D";
if( answer.length() > 1 ) answer = "X"; // Double mark
int y = 0;
if( answer.equals("A")) y = results.rows() / (int) dims.height;
if( answer.equals("B")) y = results.rows() / (int) dims.height *2;
if( answer.equals("C")) y = results.rows() / (int) dims.height *3;
if( answer.equals("D")) y = results.rows() / (int) dims.height *4;
if( answer == "" ) answer = "[-]";
Imgproc.putText( results, answer, new Point( 50* i + 15, 30 + y), Core.FONT_HERSHEY_PLAIN, 2, new Scalar(0,0,255),2);
}
//store image
storeImage(results);
//show image
showImage(results);
}
});
public void showImage (Mat img) {
ImageView imgView = (ImageView) getActivity().findViewById(R.id.sampleImageView);
//Mat mRgba = new Mat();
//mRgba = Utils.loadResource(MainAct.this, R.drawable.your_image,Highgui.CV_LOAD_IMAGE_COLOR);
Bitmap img2 = Bitmap.createBitmap(img.cols(), img.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(img, img2);
imgView.setImageBitmap(img2);
}
public File mediaStorageDir () {
File _mediaStorageDir = new File(Environment.getExternalStorageDirectory()
+ "/Android/data/"
+ getActivity().getApplicationContext().getPackageName());
return _mediaStorageDir;
}
public void storeImage(Mat matImg) {
Bitmap bitmapImg = Bitmap.createBitmap(matImg.cols(), matImg.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(matImg, bitmapImg);
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date());
File mediaFile;
String mImageName="IMG_"+ timeStamp +".jpg";
mediaFile = new File(mediaStorageDir().getPath() + File.separator + mImageName);
File pictureFile = mediaFile;
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
bitmapImg.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.close();
} catch (FileNotFoundException e) {
Log.d("FragmentMain", "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d("FragmentMain", "Error accessing file: " + e.getMessage());
}
}