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ColorBlobDetection example. Pyrdown added. Contour area filtering added.

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This commit is contained in:
Alexander Smorkalov 2012-05-12 05:19:17 +00:00
parent ba238562c6
commit b7c1fd34b9
1 changed files with 177 additions and 7 deletions
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184
samples/android/color-blob-detection/src/org/opencv/samples/colorblobdetect/ColorBlobDetectionView.java
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@ -1,9 +1,20 @@
package org.opencv.samples.colorblobdetect;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.opencv.android.Utils;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;
import org.opencv.highgui.VideoCapture;
import org.opencv.imgproc.Imgproc;
import android.content.Context;
import android.graphics.Bitmap;
@ -13,11 +24,19 @@ import android.view.SurfaceHolder;
import android.view.View;
import android.view.View.OnTouchListener;
public class ColorBlobDetectionView extends SampleCvViewBase implements
OnTouchListener {
public class ColorBlobDetectionView extends SampleCvViewBase implements OnTouchListener {
private Mat mRgba;
private static final String TAG = "Example/CollorBlobDetection";
private boolean mIsColorSelected = false;
private Scalar mSelectedColorRgba = new Scalar(255);
private Scalar mSelectedColorHsv = new Scalar(255);
private Scalar mLowerBound = new Scalar(0);
private Scalar mUpperBound = new Scalar(0);
private final Scalar mColorRadius = new Scalar(25,50,50,0);
private Mat mSpectrum = new Mat();
private int mSpectrumScale = 4;
public ColorBlobDetectionView(Context context)
{
@ -34,23 +53,114 @@ public class ColorBlobDetectionView extends SampleCvViewBase implements
}
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
// TODO Auto-generated method stub
int cols = mRgba.cols();
int rows = mRgba.rows();
Log.d(TAG, "Resolition: " + cols + "x" + rows);
int xoffset = (getWidth() - cols) / 2;
int yoffset = (getHeight() - rows) / 2;
Log.d(TAG, "Touch offset " + xoffset + "x" + yoffset);
Log.d(TAG, "Screen touch coordinates: " + event.getX() + "x" + event.getY());
int x = (int)event.getX() - xoffset;
int y = (int)event.getY() - yoffset;
double TouchedColor[] = mRgba.get(x,y);
Log.i(TAG, "Touch coordinates: (" + x + ", " + y + ")");
Log.i(TAG, "Touched rgba color: (" + TouchedColor[0] + ", " + TouchedColor[1] +
", " + TouchedColor[2] + ", " + TouchedColor[0] + ",)");
if ((x > cols) || (y > rows)) return false;
Rect TouchedRect = new Rect();
if (x-4 >= 0)
TouchedRect.x = x-4;
else
TouchedRect.x = 0;
if (y-4 >= 0)
TouchedRect.y = y-4;
else
TouchedRect.y = 0;
if (x+4 < mRgba.cols())
TouchedRect.width = x + 4 - TouchedRect.x;
else
TouchedRect.width = mRgba.width() - TouchedRect.x;
if (y+4 < mRgba.rows())
TouchedRect.height = y+4 - TouchedRect.y;
else
TouchedRect.height = mRgba.rows() - TouchedRect.y;
Mat TouchedRegionMat = mRgba.submat(TouchedRect);
Mat TouchedRegionMatHsv = new Mat();
Imgproc.cvtColor(TouchedRegionMat, TouchedRegionMatHsv, Imgproc.COLOR_RGB2HSV_FULL);
mSelectedColorHsv = Core.sumElems(TouchedRegionMatHsv);
int DotCount = TouchedRect.width*TouchedRect.height;
for (int i = 0; i < mSelectedColorHsv.val.length; i++)
{
mSelectedColorHsv.val[i] /= DotCount;
}
Mat rgbaDotMap = new Mat();
Mat hsvDotMat = new Mat(1, 1, CvType.CV_8UC3);
byte[] buf = {(byte)mSelectedColorHsv.val[0], (byte)mSelectedColorHsv.val[1], (byte)mSelectedColorHsv.val[2]};
hsvDotMat.put(0, 0, buf);
Imgproc.cvtColor(hsvDotMat, rgbaDotMap, Imgproc.COLOR_HSV2RGB_FULL, 4);
mSelectedColorRgba.val = rgbaDotMap.get(0, 0);
Log.i(TAG, "Touched rgba color: (" + mSelectedColorRgba.val[0] + ", " + mSelectedColorRgba.val[1] +
", " + mSelectedColorRgba.val[2] + ", " + mSelectedColorRgba.val[3] + ")");
double MinH = 0;
double MaxH = 255;
if (mSelectedColorHsv.val[0]-mColorRadius.val[0] >= 0)
MinH = mSelectedColorHsv.val[0]-mColorRadius.val[0];
else
MinH = 0;
if (mSelectedColorHsv.val[0]+mColorRadius.val[0] <= 255)
MaxH = mSelectedColorHsv.val[0]+mColorRadius.val[0];
else
MaxH = 255;
mLowerBound.val[0] = MinH;
mUpperBound.val[0] = MaxH;
mLowerBound.val[1] = mSelectedColorHsv.val[1] - mColorRadius.val[1];
mUpperBound.val[1] = mSelectedColorHsv.val[1] + mColorRadius.val[1];
mLowerBound.val[2] = mSelectedColorHsv.val[2] - mColorRadius.val[2];
mUpperBound.val[2] = mSelectedColorHsv.val[2] + mColorRadius.val[2];
Mat HsvSpectrum = new Mat(32, 2*(int)mColorRadius.val[0]*mSpectrumScale, CvType.CV_8UC3);
for (int i = 0; i < 32; i++)
{
for (int k = 0; k < mSpectrumScale; k++)
{
for (int j = 0; j < MaxH-MinH; j++)
{
byte[] tmp = {(byte)(MinH+j), (byte)255, (byte)255};
HsvSpectrum.put(i, j*mSpectrumScale + k, tmp);
}
}
}
Imgproc.cvtColor(HsvSpectrum, mSpectrum, Imgproc.COLOR_HSV2RGB_FULL, 4);
mIsColorSelected = true;
return false; // don't need subsequent touch events
}
@ -61,6 +171,66 @@ public class ColorBlobDetectionView extends SampleCvViewBase implements
capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.ARGB_8888);
if (mIsColorSelected)
{
Mat PyrDownMat = new Mat();
Imgproc.pyrDown(mRgba, PyrDownMat);
Imgproc.pyrDown(PyrDownMat, PyrDownMat);
Mat hsvMat = new Mat();
Imgproc.cvtColor(PyrDownMat, hsvMat, Imgproc.COLOR_RGB2HSV_FULL);
Log.d(TAG, "Bounds: " + mLowerBound + "x" + mUpperBound);
Mat RangedHsvMat = new Mat();
Core.inRange(hsvMat, mLowerBound, mUpperBound, RangedHsvMat);
Mat DilatedMat = new Mat();
Imgproc.dilate(RangedHsvMat, DilatedMat, new Mat());
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat hierarchy = new Mat();
Imgproc.findContours(DilatedMat, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
// Find max contour area
double MaxArea = 0;
Iterator<MatOfPoint> it = contours.iterator();
while (it.hasNext())
{
MatOfPoint wrapper = it.next();
double Area = Imgproc.contourArea(wrapper);
if (Area > MaxArea)
MaxArea = Area;
}
// Filter contours by area and resize to fit the original image size
List<MatOfPoint> FilteredContours = new ArrayList<MatOfPoint>();
it = contours.iterator();
while (it.hasNext())
{
MatOfPoint wrapper = it.next();
if (Imgproc.contourArea(wrapper) > 0.01*MaxArea);
Point[] contour = wrapper.toArray();
for (int i = 0; i < contour.length; i++)
{
contour[i].x *= 4;
contour[i].y *= 4;
}
FilteredContours.add(new MatOfPoint(contour));
}
Imgproc.drawContours(mRgba, FilteredContours, -1, new Scalar(255,0,0,255));
Mat TestColorMat = mRgba.submat(2, 34, 2, 34);
TestColorMat.setTo(mSelectedColorRgba);
Mat TestSpectrumMat = mRgba.submat(2, 34, 38, 38 + mSpectrum.cols());
mSpectrum.copyTo(TestSpectrumMat);
}
try {
Utils.matToBitmap(mRgba, bmp);
} catch(Exception e) {