First prototype

clahe.cpp

@@ -0,0 +1,50 @@
+#include "clahe.h"
+#include <QDebug>
+
+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);
+    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;
+}
+
+void CLAHE::saveFile(const QString &path)
+{
+
+}
+
+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);
+    double min, max;
+    cv::minMaxLoc(_image[0], &min, &max);
+    qDebug() << min << max;
+}
+
+QPixmap CLAHE::getImage() const
+{
+    cv::Mat tmp;
+    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);
+    //ret.bits();//perform deep copy of tmp.data pointer
+    return QPixmap::fromImage(ret);
+}

clahe.h

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+#ifndef CLAHE_H
+#define CLAHE_H
+
+#include <QImage>
+#include <QPixmap>
+#include <QString>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/imgcodecs.hpp>
+
+class CLAHE
+{
+    cv::Mat _lumImage;
+    cv::Mat _image[3];
+    cv::Ptr<cv::CLAHE> _clahe;
+public:
+    CLAHE();
+    void loadFile(const QString &path);
+    void saveFile(const QString &path);
+    void apply(float clipLimit, int kernelSize);
+    QPixmap getImage() const;
+};
+
+#endif // CLAHE_H

clahe.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2020-01-21T16:48:44
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = clahe
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+CONFIG += c++11 link_pkgconfig
+
+PKGCONFIG += opencv
+
+SOURCES += \
+        main.cpp \
+        mainwindow.cpp \
+    clahe.cpp
+
+HEADERS += \
+        mainwindow.h \
+    clahe.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

main.cpp

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+#include "mainwindow.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

mainwindow.cpp

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+#include "mainwindow.h"
+#include <QStandardPaths>
+#include <QFileDialog>
+#include <QMenuBar>
+#include "clahe.h"
+
+MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
+{
+    setupUI();
+}
+
+MainWindow::~MainWindow()
+{
+}
+
+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 (*)"));
+    if(!path.isEmpty())
+    {
+        CLAHE cl;
+        cl.loadFile(path);
+        cl.apply(5, 64);
+        QPixmap pixmap;
+        pixmap = cl.getImage();
+        _image->setPixmap(pixmap);
+    }
+}
+
+void MainWindow::saveFile()
+{
+
+}
+
+void MainWindow::setupUI()
+{
+    resize(1024, 768);
+
+    QMenu *fileMenu = menuBar()->addMenu(tr("File"));
+    fileMenu->addAction(tr("Open file"), this, SLOT(openFile()), QKeySequence("Ctrl+O"));
+    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);
+}

mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QLabel>
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+    QLabel *_image;
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+public slots:
+    void openFile();
+    void saveFile();
+private:
+    void setupUI();
+};
+
+#endif // MAINWINDOW_H