add support for chaning cvimage scaleing in ui

cahnge .desktop exec params

src/ui/cvimageviewer.h

@@ -4,6 +4,8 @@
 #include <QWidget>
 #include <QPainter>
 #include <QMenu>
+#include <QSlider>
+#include <limits>
 #include "../cameras.h"
 
 class CvImageViewer : public QWidget
@@ -25,6 +27,7 @@ private:
 	cv::Rect roi_;
 	QRect selectionRect_;
 	bool selectionStarted_ = false;
+	double clamp_ = std::numeric_limits<double>::max();
 
 	void transfromToSourceCoordinates(int inX, int inY, int& outX, int& outY);
 	void convertImage(cv::Mat image);
@@ -44,9 +47,11 @@ protected:
 
 signals:
 	void sigValue(size_t x, size_t y, double value);
+	void sigMax(double max);
 
 public slots:
 	void setImage(Camera::Image img);
+	void setClamp(double max);
 
 public:
 	explicit CvImageViewer(QWidget *parent = nullptr, size_t lastId = 0);