allow saveing main viewer image as png

src/ui/mainwindow.cpp

@@ -20,6 +20,8 @@
 #include <QMessageBox>
 #include <uvosled.h>
 #include <QFileDialog>
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/imgproc.hpp>
 
 #include "../profile.h"
 
@@ -86,10 +88,20 @@ void MainWindow::saveImage()
 
 void MainWindow::openImage()
 {
-	QString fileName = QFileDialog::getOpenFileName(this, "Open Image", lastSavedPath_, "*.mat");
+	QString fileName = QFileDialog::getOpenFileName(this, "Open Image", lastSavedPath_, "*.mat *.png");
 	if(!fileName.isEmpty())
 	{
 		cv::Mat image;
+		QStringList tokens = fileName.split('.');
+		if(tokens.back() == "png")
+		{
+			image = cv::imread(fileName.toStdString());
+			if(image.data && image.channels() == 3)
+				cv::cvtColor(image, image, cv::COLOR_BGR2GRAY);
+			image.convertTo(image, CV_32FC1, 1.0/255.0, 0);
+		}
+		else
+		{
 			cv::FileStorage matf(fileName.toStdString(), cv::FileStorage::READ);
 			try
 			{
@@ -107,13 +119,17 @@ void MainWindow::openImage()
 				image.release();
 				QMessageBox::warning(this, "Invalid file", "File selected dose not contain a valid image");
 			}
-		else if(!image.data)
+			matf.release();
+		}
+		if(!image.data)
 		{
 			QMessageBox::warning(this, "Can no open", "Can not open file selected");
 		}
-		matf.release();
+		else
+		{
 			ui->mainViewer->setImage(Camera::Image(image, 0));
 		}
+	}
 }
 
 void MainWindow::enableCapture(bool enable)