Finished prototype

clahe.cpp

@@ -1,38 +1,38 @@
 #include "clahe.h"
 #include <QDebug>
+#include <opencv2/highgui.hpp>
 
 CLAHE::CLAHE()
 {
-    _clahe = cv::createCLAHE();
 }
 
 void CLAHE::loadFile(const QString &path)
 {
     cv::Mat tmp;
     tmp = cv::imread(path.toStdString(), cv::IMREAD_COLOR | cv::IMREAD_ANYDEPTH);
-    double scale = tmp.depth()==CV_8U ? 1.0/255 : 1.0/65535;
-    tmp.convertTo(tmp, CV_32F, scale);
+    int type = tmp.depth();
+    _scale = type==CV_8U ? 1.0/255 : 1.0/65535;
+    tmp.convertTo(tmp, CV_32F, _scale);
     cv::cvtColor(tmp, tmp, cv::COLOR_BGR2Lab);
     cv::split(tmp, _image);
-    _image[0].convertTo(_lumImage, CV_16U, 655.35);
-    double min, max;
-    cv::minMaxLoc(_image[0], &min, &max);
-    qDebug() << scale << min << max;
+    _image[0].convertTo(_lumImage, type, 0.01/_scale);
 }
 
 void CLAHE::saveFile(const QString &path)
 {
-
+    cv::Mat tmp;
+    cv::merge(_image, 3, tmp);
+    cv::cvtColor(tmp, tmp, cv::COLOR_Lab2BGR);
+    tmp.convertTo(tmp, _lumImage.depth(), 1/_scale);
+    cv::imwrite(path.toStdString(), tmp);
 }
 
 void CLAHE::apply(float clipLimit, int kernelSize)
 {
     cv::Mat lum;
-    _clahe->setClipLimit(clipLimit);
-    _clahe->setTilesGridSize(cv::Size(kernelSize, kernelSize));
-    _clahe->apply(_lumImage, lum);
-    //lum = _lumImage;
-    lum.convertTo(_image[0], CV_32F, 1.0/655.35);
+    cv::Ptr<cv::CLAHE> clahe = cv::createCLAHE(clipLimit, cv::Size(kernelSize, kernelSize));
+    clahe->apply(_lumImage, lum);
+    lum.convertTo(_image[0], CV_32F, 100*_scale);
     double min, max;
     cv::minMaxLoc(_image[0], &min, &max);
     qDebug() << min << max;
@@ -44,7 +44,15 @@ QPixmap CLAHE::getImage() const
     cv::merge(_image, 3, tmp);
     cv::cvtColor(tmp, tmp, cv::COLOR_Lab2RGB);
     tmp.convertTo(tmp, CV_8U, 255);
-    QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step, QImage::Format_RGB888);
+    QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step1(), QImage::Format_RGB888);
     //ret.bits();//perform deep copy of tmp.data pointer
     return QPixmap::fromImage(ret);
 }
+
+QPixmap CLAHE::getLumImage() const
+{
+    cv::Mat tmp;
+    _image[0].convertTo(tmp, CV_8U, 2.55);
+    QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step1(), QImage::Format_Grayscale8);
+    return QPixmap::fromImage(ret);
+}

clahe.h

@@ -11,13 +11,14 @@ class CLAHE
 {
     cv::Mat _lumImage;
     cv::Mat _image[3];
-    cv::Ptr<cv::CLAHE> _clahe;
+    double _scale;
 public:
     CLAHE();
     void loadFile(const QString &path);
     void saveFile(const QString &path);
     void apply(float clipLimit, int kernelSize);
     QPixmap getImage() const;
+    QPixmap getLumImage() const;
 };
 
 #endif // CLAHE_H

clahe.pro

@@ -29,11 +29,13 @@ PKGCONFIG += opencv
 SOURCES += \
         main.cpp \
         mainwindow.cpp \
-    clahe.cpp
+    clahe.cpp \
+    imagescrollarea.cpp
 
 HEADERS += \
         mainwindow.h \
-    clahe.h
+    clahe.h \
+    imagescrollarea.h
 
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin

imagescrollarea.cpp

@@ -0,0 +1,121 @@
+#include "imagescrollarea.h"
+#include <QMouseEvent>
+#include <QScrollBar>
+#include <QKeyEvent>
+#include <QPalette>
+#include <QDebug>
+
+ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent),
+    m_scale(-1)
+{
+    m_label = new QLabel(this);
+    setWidget(m_label);
+    setAlignment(Qt::AlignCenter);
+    setBackgroundRole(QPalette::Dark);
+}
+
+void ImageScrollArea::setImage(const QPixmap &img)
+{
+    m_pixmap = img;
+    QPixmap pix;
+    if(m_scale < 0)
+        pix = img.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
+    else
+        pix = img.scaled(img.size() * m_scale, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+
+    m_label->setPixmap(pix);
+    m_label->resize(pix.size());
+
+    horizontalScrollBar()->setValue(horizontalScrollBar()->maximum() / 2);
+    verticalScrollBar()->setValue(verticalScrollBar()->maximum() / 2);
+}
+
+void ImageScrollArea::setScale(float scale)
+{
+    if(scale > 4 || (scale < 0.2 && scale > 0) || m_pixmap.isNull())
+        return;
+
+    m_scale = scale;
+    QSize newSize = m_scale < 0 ? size() : m_pixmap.size()*scale;
+    m_label->setPixmap(m_pixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+    m_label->resize(newSize);
+}
+
+void ImageScrollArea::zoomIn()
+{
+    if(m_scale < 0)
+        m_scale = (float)size().width()/m_pixmap.size().width();
+
+    setScale(m_scale + 0.1);
+}
+
+void ImageScrollArea::zoomOut()
+{
+    if(m_scale < 0)
+        m_scale = (float)size().width()/m_pixmap.size().width();
+
+    setScale(m_scale - 0.1);
+}
+
+void ImageScrollArea::bestFit()
+{
+    setScale(-1);
+}
+
+void ImageScrollArea::oneToOne()
+{
+    setScale(1);
+}
+
+void ImageScrollArea::keyPressEvent(QKeyEvent *event)
+{
+    event->ignore();
+}
+
+void ImageScrollArea::keyReleaseEvent(QKeyEvent *event)
+{
+    event->ignore();
+}
+
+void ImageScrollArea::mouseMoveEvent(QMouseEvent *event)
+{
+    QPoint delta = m_lastPos - event->pos();
+    horizontalScrollBar()->setValue(horizontalScrollBar()->value() + delta.x());
+    verticalScrollBar()->setValue(verticalScrollBar()->value() + delta.y());
+    m_lastPos = event->pos();
+}
+
+void ImageScrollArea::mousePressEvent(QMouseEvent *event)
+{
+    m_lastPos = event->pos();
+}
+
+void ImageScrollArea::resizeEvent(QResizeEvent *event)
+{
+    if(m_scale < 0 && !m_pixmap.isNull())
+    {
+        m_label->setPixmap(m_pixmap.scaled(event->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
+        m_label->resize(event->size());
+    }
+    QScrollArea::resizeEvent(event);
+}
+
+void ImageScrollArea::wheelEvent(QWheelEvent *event)
+{
+    if(m_scale < 0)
+        m_scale = (float)size().width()/m_pixmap.size().width();
+
+    QPointF top(horizontalScrollBar()->value(), verticalScrollBar()->value());
+    QPointF mousePos = (top + event->posF()) / m_scale;
+
+    QPoint delta = event->angleDelta();
+    if(delta.y() > 0)
+        setScale(m_scale + 0.1);
+    else
+        setScale(m_scale - 0.1);
+
+    mousePos *= m_scale;
+    top = mousePos - event->posF();
+    horizontalScrollBar()->setValue(top.x());
+    verticalScrollBar()->setValue(top.y());
+}

imagescrollarea.h

@@ -0,0 +1,32 @@
+#ifndef IMAGESCROLLAREA_H
+#define IMAGESCROLLAREA_H
+
+#include <QScrollArea>
+#include <QLabel>
+
+class ImageScrollArea : public QScrollArea
+{
+    Q_OBJECT
+    QPoint m_lastPos;
+    QLabel *m_label;
+    QPixmap m_pixmap;
+    float m_scale;
+public:
+    explicit ImageScrollArea(QWidget *parent = 0);
+    void setImage(const QPixmap &img);
+    void setScale(float scale);
+public slots:
+    void zoomIn();
+    void zoomOut();
+    void bestFit();
+    void oneToOne();
+protected:
+    void keyPressEvent(QKeyEvent *event);
+    void keyReleaseEvent(QKeyEvent *event);
+    void mouseMoveEvent(QMouseEvent *event);
+    void mousePressEvent(QMouseEvent *event);
+    void resizeEvent(QResizeEvent *event);
+    void wheelEvent(QWheelEvent *event);
+};
+
+#endif // IMAGESCROLLAREA_H

mainwindow.cpp

@@ -2,36 +2,53 @@
 #include <QStandardPaths>
 #include <QFileDialog>
 #include <QMenuBar>
+#include <QPushButton>
+#include <QLineEdit>
+#include <QDockWidget>
+#include <QHBoxLayout>
 #include "clahe.h"
 
+const QString imageFilter = "Images (*.png *.jpg *.jpeg);;All files (*)";
+
 MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
 {
     setupUI();
+    _clahe = new CLAHE;
 }
 
 MainWindow::~MainWindow()
 {
+    delete _clahe;
 }
 
 void MainWindow::openFile()
 {
     QStringList list = QStandardPaths::standardLocations(QStandardPaths::StandardLocation::PicturesLocation);
     list.append("");
-    QString path = QFileDialog::getOpenFileName(this, tr("Open image"), list.first(), tr("Images (*.png *.jpg *.jpeg);;All files (*)"));
+    QString path = QFileDialog::getOpenFileName(this, tr("Open image"), list.first(), imageFilter);
     if(!path.isEmpty())
     {
-        CLAHE cl;
-        cl.loadFile(path);
-        cl.apply(5, 64);
-        QPixmap pixmap;
-        pixmap = cl.getImage();
-        _image->setPixmap(pixmap);
+        _clahe->loadFile(path);
+        applyClahe();
     }
 }
 
 void MainWindow::saveFile()
 {
+    QStringList list = QStandardPaths::standardLocations(QStandardPaths::StandardLocation::PicturesLocation);
+    QString path = QFileDialog::getSaveFileName(this, tr("Save image"), list.first(), imageFilter);
+    if(!path.isEmpty())
+    {
+        _clahe->saveFile(path);
+    }
+}
 
+void MainWindow::applyClahe()
+{
+    QPixmap pixmap;
+    _clahe->apply(_clipLimitSlider->value()/100.0f, _kernelSizeSelect->currentText().toInt());
+    pixmap = _clahe->getImage();
+    _imageScrollArea->setImage(pixmap);
 }
 
 void MainWindow::setupUI()
@@ -43,6 +60,39 @@ void MainWindow::setupUI()
     fileMenu->addAction(tr("Save file"), this, SLOT(saveFile()), QKeySequence("Ctrl+S"));
     fileMenu->addAction(tr("Quit"), this, SLOT(close()), QKeySequence("Ctrl+Q"));
 
-    _image = new QLabel(this);
-    setCentralWidget(_image);
+    _clipLimitEdit  = new QLineEdit;
+    _clipLimitEdit->setInputMask("000.00");
+    _clipLimitEdit->setText("1.00");
+    _clipLimitEdit->setMaximumWidth(100);
+
+    _clipLimitSlider = new QSlider(Qt::Horizontal);
+    _clipLimitSlider->setRange(0, 10000);
+    _clipLimitSlider->setValue(100);
+    connect(_clipLimitSlider, SIGNAL(valueChanged(int)), this, SLOT(clipSliderValueChanged(int)));
+
+    QPushButton *applyButton = new QPushButton(tr("Apply"));
+    connect(applyButton, SIGNAL(clicked()), this, SLOT(applyClahe()));
+
+    _kernelSizeSelect = new QComboBox;
+    _kernelSizeSelect->addItems({"8", "16", "32", "64", "128", "256"});
+
+    QHBoxLayout *claheLayout = new QHBoxLayout;
+    claheLayout->addWidget(_clipLimitEdit);
+    claheLayout->addWidget(_clipLimitSlider);
+    claheLayout->addWidget(_kernelSizeSelect);
+    claheLayout->addWidget(applyButton);
+
+    QDockWidget *claheDock = new QDockWidget(tr("CLAHE"), this);
+    QWidget *claheWidget = new QWidget(claheDock);
+    claheDock->setWidget(claheWidget);
+    claheWidget->setLayout(claheLayout);
+    addDockWidget(Qt::TopDockWidgetArea, claheDock);
+
+    _imageScrollArea = new ImageScrollArea(this);
+    setCentralWidget(_imageScrollArea);
+}
+
+void MainWindow::clipSliderValueChanged(int value)
+{
+    _clipLimitEdit->setText(QString::number(value/100.0));
 }

mainwindow.h

@@ -3,19 +3,29 @@
 
 #include <QMainWindow>
 #include <QLabel>
+#include <QComboBox>
+#include "clahe.h"
+#include "imagescrollarea.h"
 
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
-    QLabel *_image;
+    QComboBox *_kernelSizeSelect;
+    QSlider *_clipLimitSlider;
+    QLineEdit *_clipLimitEdit;
+    CLAHE *_clahe;
+    ImageScrollArea *_imageScrollArea;
 public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 public slots:
     void openFile();
     void saveFile();
+    void applyClahe();
 private:
     void setupUI();
+private slots:
+    void clipSliderValueChanged(int value);
 };
 
 #endif // MAINWINDOW_H