OZ++ Sample: HoughLineDetector |
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* HoughLineDetector.cpp
*
*****************************************************************************/
//2017/06/10
//This is a simple example to apply cv::HoughLinesP API to
// a gray scale edged image gotten from cv::Canny API.
// See: http://docs.opencv.org/2.4/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.html
//2019/01/03
#include <opencv2/stitching.hpp>
#include <oz++/motif/Label.h>
#include <oz++/motif/RowColumn.h>
#include <oz++/motif/LabeledTrackBar.h>
#include <oz++/opencv/OpenCVScaleComboBox.h>
#include <oz++/opencv/OpenCVMainView.h>
#include <oz++/opencv/OpenCVImageView.h>
#include <oz++/motif/FileOpenDialog.h>
namespace OZ {
class MainView :public OpenCVMainView {
private:
///////////////////////////////////////////////
//Inner classes start.
class OriginalImageView: public OpenCVImageView {
private:
cv::Mat originalImage;
cv::Mat scaledImage;
virtual void display()
{
show(scaledImage);
}
public:
OriginalImageView(View* parent, const char* name, Args& args)
:OpenCVImageView(parent, name, args)
{
try {
const char* filename = (const char*)args.get(XmNimageFileName);
int imageLoadingFlag = args.get(XmNimageLoadingFlag);
int scalingRatio = (int)args.get(XmNimageScalingRatio);
loadImage(filename, imageLoadingFlag, scalingRatio);
} catch (OZ::Exception ex) {
caught(ex);
}
}
~OriginalImageView()
{
}
void loadImage(const char* filename,
int imageLoadingFlag= CV_LOAD_IMAGE_COLOR,
int scalingRatio=100)
{
originalImage = readImage(filename, imageLoadingFlag);
scaleImage(originalImage, scaledImage, scalingRatio);
}
void rescale(int scalingRatio)
{
scaledImage.release();
scaleImage(originalImage, scaledImage, scalingRatio);
}
};
class DetectedImageView: public OpenCVImageView {
private:
cv::Mat originalImage;
cv::Mat grayImage;
cv::Mat detectedImage;
cv::Mat scaledImage;
//The scale image is displayed on this image view.
virtual void display()
{
show(scaledImage);
}
public:
DetectedImageView(View* parent, const char* name, Args& args)
:OpenCVImageView(parent, name, args)
{
try {
const char* filename = (const char*)args.get(XmNimageFileName);
int imageLoadingFlag = args.get(XmNimageLoadingFlag);
int scalingRatio = (int)args.get(XmNimageScalingRatio);
loadImage(filename, imageLoadingFlag, scalingRatio);
} catch (OZ::Exception ex) {
caught(ex);
}
}
~DetectedImageView()
{
}
void loadImage(const char* filename,
int imageLoadingFlag= CV_LOAD_IMAGE_COLOR,
int scalingRatio=100)
{
originalImage = readImage(filename, imageLoadingFlag);
detectedImage = originalImage.clone();
detectedImage.create( originalImage.size(), originalImage.type() );
cv::cvtColor( originalImage, grayImage, COLOR_BGR2GRAY );
scaleImage(grayImage, scaledImage, scalingRatio);
}
void rescale(int scalingRatio)
{
scaledImage.release();
scaleImage(detectedImage, scaledImage, scalingRatio);
}
int detect(int threshold1, int threshold2, int scalingRatio)
{
threshold1 = (threshold1/2)*2 + 1;
threshold2 = (threshold2/2)*2 + 1;
//1 Apply cv::Canny to the grayImage to get edges in the grayImage.
cv::Canny(grayImage, detectedImage,
(double)threshold1, (double)threshold2);
//2 Apply HoughLinesP to detectedImage returned by cv::Canny.
vector<Vec4i> lines;
HoughLinesP(detectedImage, lines, 1, CV_PI/180, 50, 50, 10 );
//3 Put a clone of ogirinalImage to the detectedImage,
// since the detectedImage is not necessary any more.
detectedImage.release();
detectedImage = originalImage.clone();
int detectedNumber = lines.size();
//4 Draw lines on the clone of the original image.
for( size_t i = 0; i < lines.size(); i++ ) {
Vec4i l = lines[i];
line( detectedImage, Point(l[0], l[1]),
Point(l[2], l[3]), Scalar(0,0,255), 3, CV_AA);
}
scaleImage(detectedImage, scaledImage, scalingRatio);
return detectedNumber;
}
};
//Inner classes end.
private:
StringT<char> imageFile;
int imageLoadingFlag;
int imageScalingRatio; //percentage
SmartPtr<Label> label;
SmartPtr<OriginalImageView> originalImage;
SmartPtr<DetectedImageView> detectedImage;
SmartPtr<RowColumn> controlPane;
SmartPtr<OpenCVScaleComboBox> scaleComboBox;
int threshold1Max;
int threshold1;
SmartPtr<LabeledTrackBar> threshold1TrackBar;
int threshold2Max;
int threshold2;
SmartPtr<LabeledTrackBar> threshold2TrackBar;
SmartPtr<Label> detectedNumber;
SmartPtr<FileOpenDialog> fileDialog;
public:
void scaleChanged(Action& action)
{
int val = scaleComboBox->getScale();
if (val > 0 && imageScalingRatio != val) {
imageScalingRatio = val;
originalImage -> rescale(imageScalingRatio);
detectedImage -> rescale(imageScalingRatio);
}
}
void trackBarScrolled1(Action& action)
{
threshold1 = threshold1TrackBar->getPosition();
threshold2 = threshold2TrackBar->getPosition();
int number = detectedImage->detect(threshold1, threshold2, imageScalingRatio);
setDetectedNumber(number);
}
void trackBarScrolled2(Action& action)
{
threshold1 = threshold1TrackBar->getPosition();
threshold2 = threshold2TrackBar->getPosition();
int number = detectedImage->detect(threshold1, threshold2, imageScalingRatio);
setDetectedNumber(number);
}
void cancel(Action& action)
{
fileDialog->popdown();
}
void fileOpen(Action& action)
{
fileDialog->popup();
}
void updateLabel(const char* filename)
{
CompoundString cs(filename);
label->set(XmNlabelString, cs);
}
void setDetectedNumber(int number)
{
char string[128];
sprintf(string, "DetectedNumber:%d", number);
CompoundString cs(string);
detectedNumber->set(XmNlabelString, cs);
}
void ok(Action& action)
{
try {
imageFile = fileDialog->getFileName();
const char* filename = (const char*)imageFile;
printf("filename: %s\n", filename);
fileDialog->popdown();
originalImage->invalidate();
originalImage->loadImage(filename,
imageLoadingFlag, imageScalingRatio);
originalImage->invalidate();
detectedImage ->loadImage(filename,
imageLoadingFlag, imageScalingRatio);
threshold1 = threshold1TrackBar->getPosition();
threshold2 = threshold2TrackBar->getPosition();
int number = detectedImage->detect(threshold1, threshold2, imageScalingRatio);
setDetectedNumber(number);
updateLabel(filename);
resize(width(), height());
flush();
} catch (OZ::Exception& ex) {
caught(ex);
}
}
void resize(Dimension w, Dimension h)
{
int CP_WIDTH = 200;
int LB_HEIGHT = 30;
int ww = w-CP_WIDTH;
int hh = h - LB_HEIGHT;
if (label && originalImage && detectedImage && controlPane
) {
label -> reshape(0, 0, w, LB_HEIGHT);
originalImage-> reshape(0, LB_HEIGHT, ww/2, hh);
detectedImage -> reshape(ww/2, LB_HEIGHT, ww/2-1, hh);
controlPane -> reshape(ww-1, LB_HEIGHT, CP_WIDTH+1, hh);
//The following two lines are a workaround to erase garbage.
controlPane -> unmap();
controlPane -> map();
}
flush();
}
public:
MainView(OpenCVApplication& applet, const char* name, Args& args)
:OpenCVMainView(applet, name, args)
{
BulletinBoard* bboard = getBulletinBoard();
imageFile = "../images/GinzaWako.png";
imageLoadingFlag = CV_LOAD_IMAGE_COLOR;
imageScalingRatio = 60; //%
try {
Args ar;
CompoundString fileNamecs(imageFile);
ar.set(XmNlabelString, fileNamecs);
ar.set(XmNalignment, XmALIGNMENT_BEGINNING);
label = new Label(bboard, "", ar);
ar.reset();
ar.set(XmNimageFileName, imageFile);
ar.set(XmNimageLoadingFlag, imageLoadingFlag);
ar.set(XmNimageScalingRatio, imageScalingRatio);
originalImage = new OriginalImageView(bboard, "", ar);
ar.reset();
ar.set(XmNimageFileName, imageFile);
ar.set(XmNimageLoadingFlag, imageLoadingFlag);
ar.set(XmNimageScalingRatio, imageScalingRatio);
detectedImage = new DetectedImageView(bboard, "", ar);
ar.reset();
controlPane = new RowColumn(bboard, "", ar);
const char* defaultScale = "60%";
ar.reset();
CompoundString scaler("Scale");
ar.set(XmNlabelString, scaler);
ar.set(XmNdefaultScale, defaultScale);
scaleComboBox = new OpenCVScaleComboBox(controlPane, "", ar);
scaleComboBox->addCallback(XmNselectionCallback, this,
(Callback)&MainView::scaleChanged, NULL);
threshold1Max = 300;
threshold2Max = 300;
threshold1 = 120;
threshold2 = 130;
ar.reset();
CompoundString th1Title("Canny Threshold1:[0,300]");
ar.set(XmNminimum, 0);
ar.set(XmNmaximum, threshold1Max);
ar.set(XmNvalue, threshold1);
ar.set(XmNtitleString, th1Title);
threshold1TrackBar = new LabeledTrackBar(controlPane, "", ar);
threshold1TrackBar->addCallback(XmNvalueChangedCallback, this,
(Callback)&MainView::trackBarScrolled1, NULL);
ar.reset();
CompoundString th2Title("Canny Threshold2:[0,300]");
ar.set(XmNminimum, 0);
ar.set(XmNmaximum, threshold1Max);
ar.set(XmNvalue, threshold1);
ar.set(XmNtitleString, th2Title);
threshold2TrackBar = new LabeledTrackBar(controlPane, "", ar);
threshold2TrackBar->addCallback(XmNvalueChangedCallback, this,
(Callback)&MainView::trackBarScrolled2, NULL);
ar.reset();
detectedNumber = new Label(controlPane, "", ar);
int number = detectedImage->detect(threshold1, threshold2, imageScalingRatio);
setDetectedNumber(number);
ar.reset();
fileDialog = new FileOpenDialog(this, "FileOpenDialog", ar);
fileDialog -> getOkButton()
-> addCallback(XmNactivateCallback, this,
(Callback)&MainView::ok, NULL);
sendConfigureEvent();
} catch(OZ::Exception& ex) {
caught(ex);
}
}
~MainView()
{
}
};
}
//
int main(int argc, char** argv)
{
try {
const char* appclass = argv[0];
OpenCVApplication applet(appclass, argc, argv);
Args args;
args.set(XmNwidth, 900);
args.set(XmNheight, 380);
MainView view(applet, argv[0], args);
view.realize();
applet.run();
} catch (OZ::Exception& ex) {
caught(ex);
}
return 0;
}