diff --git a/ora6/.clangd b/ora6/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/American_Eskimo_Dog.jpg b/ora6/American_Eskimo_Dog.jpg
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diff --git a/ora6/Képek (morfológia)-20251030.zip b/ora6/Képek (morfológia)-20251030.zip
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diff --git a/ora6/Makefile b/ora6/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/annotalt_sejt.png b/ora6/annotalt_sejt.png
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diff --git a/ora6/histo.cpp b/ora6/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/histo.h b/ora6/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/labirintus.png b/ora6/labirintus.png
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diff --git a/ora6/main.cpp b/ora6/main.cpp
new file mode 100644
index 0000000..d20cd44
--- /dev/null
+++ b/ora6/main.cpp
@@ -0,0 +1,26 @@
+#include "histo.h"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(){
+    Mat img = imread("dark_img.jpg", IMREAD_GRAYSCALE);
+    imshow("img", img);
+    Histo::showHisto(img);
+
+    double ah, fh;
+    minMaxLoc(img, &ah, &fh);
+
+    fh = 30;
+
+    Mat dest = (ah == fh) ? img.clone() : (img-ah) * 255 / (fh-ah);
+
+    imshow("dest", dest);
+    Histo::showHisto(dest, "eredmeny");
+
+    waitKey();
+    return 0;
+}
diff --git a/ora6/proj/.clangd b/ora6/proj/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/proj/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/proj/Makefile b/ora6/proj/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/proj/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/proj/histo.cpp b/ora6/proj/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/proj/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/proj/histo.h b/ora6/proj/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/proj/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/proj/histo.o b/ora6/proj/histo.o
new file mode 100644
index 0000000..fceefea
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diff --git a/ora6/proj/main b/ora6/proj/main
new file mode 100755
index 0000000..3f8afbc
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diff --git a/ora6/proj/main.cpp b/ora6/proj/main.cpp
new file mode 100644
index 0000000..43cb907
--- /dev/null
+++ b/ora6/proj/main.cpp
@@ -0,0 +1,46 @@
+#include "histo.h"
+#include "opencv2/imgcodecs.hpp"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+void thinning(const Mat img, Mat& skel){
+    Mat mask, se, eroded, tmp;
+    mask = img.clone();
+
+    se = Mat::zeros(img.size(), CV_8UC1);
+    se = getStructuringElement(MORPH_CROSS, Size(3,3));
+
+    while(true){
+        erode(mask, eroded, se);
+        dilate(eroded, tmp, se);
+        tmp = mask - tmp;
+        skel = skel | tmp;
+        eroded.copyTo(mask); //shallow copy miatt kulonben csak a fejlecet masolja
+        
+        if(countNonZero(mask) == 0){
+            break;
+        }
+        imshow("mask", mask);
+        imshow("skel", skel);
+        waitKey(100);
+    }
+}
+
+
+int main(){
+    Mat img = imread("../wrench.jpg", IMREAD_GRAYSCALE);
+    Mat mask, skel;
+
+    threshold(img, mask, 80, 255, THRESH_BINARY_INV);
+    //medianBlur(mask, mask, 7);
+    thinning(mask, skel);
+
+    imshow("mask", mask);
+
+    waitKey(0);
+    return 0;
+}
diff --git a/ora6/proj/main.o b/ora6/proj/main.o
new file mode 100644
index 0000000..bc3a102
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diff --git a/ora6/proj1/.clangd b/ora6/proj1/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/proj1/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/proj1/Makefile b/ora6/proj1/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/proj1/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/proj1/histo.cpp b/ora6/proj1/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/proj1/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/proj1/histo.h b/ora6/proj1/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/proj1/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/proj1/histo.o b/ora6/proj1/histo.o
new file mode 100644
index 0000000..fceefea
Binary files /dev/null and b/ora6/proj1/histo.o differ
diff --git a/ora6/proj1/main.cpp b/ora6/proj1/main.cpp
new file mode 100644
index 0000000..5013886
--- /dev/null
+++ b/ora6/proj1/main.cpp
@@ -0,0 +1,67 @@
+#include "histo.h"
+#include "opencv2/imgcodecs.hpp"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+void Roberts(const Mat& img){
+    Mat g, gx, gy, g2, edge, edge2;
+    gx = Mat::zeros(img.size(), CV_16S);
+    gy = Mat::zeros(img.size(), CV_16S);
+
+    for (int i = 0; i < img.rows -1; i++) {
+        for (int j = 0; j < img.cols -1; j++) {
+            gx.at<short>(i,j) = img.at<uchar>(i,j) - img.at<uchar>(i+1, j+1);
+            gy.at<short>(i,j) = img.at<uchar>(i,j+1) - img.at<uchar>(i+1, j);
+        }
+    }
+    
+    g = cv::abs(gx) + cv::abs(gy);
+
+    convertScaleAbs(g, g2);
+
+    threshold(g2, edge, 0, 255, THRESH_OTSU);
+    threshold(g2, edge2, 0, 255, THRESH_TRIANGLE);
+    
+    imshow("edge", edge);
+    imshow("edg2", edge2);
+
+    //imshow("g", g * 255);
+    //imshow("gx", gx * 255);
+    //imshow("gy", gy * 255);
+}
+
+void sobel(const Mat img){
+    Mat g, g2, gx, gy;
+    
+    Sobel(img, gx, CV_32F, 1,0);
+    Sobel(img, gy, CV_32F, 0,1);
+
+
+    //g = cv::abs(gx) + cv::abs(gy);
+    //cv::sqrt(gx.mul(gx) + gy.mul(gy));
+    convertScaleAbs(g, g2);
+    //imshow("gx", gx / 255);
+    //imshow("gx", gy / 255);
+    //imshow("g2", g2);
+    
+    Mat dest;
+    Laplacian(img, dest, CV_16S, 3);
+    convertScaleAbs(dest, dest);
+    imshow("dest", dest);
+
+    waitKey(0);
+}
+
+int main(){
+    Mat img = imread("../go2.png", IMREAD_GRAYSCALE);
+    imshow("ered", img);
+    //Roberts(img);
+    sobel(img);
+
+    while(waitKey(3) != 'q');
+    return 0;
+}
diff --git a/ora6/proj2/.clangd b/ora6/proj2/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/proj2/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/proj2/Makefile b/ora6/proj2/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/proj2/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/proj2/histo.cpp b/ora6/proj2/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/proj2/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/proj2/histo.h b/ora6/proj2/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/proj2/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/proj2/main.cpp b/ora6/proj2/main.cpp
new file mode 100644
index 0000000..e071fe0
--- /dev/null
+++ b/ora6/proj2/main.cpp
@@ -0,0 +1,14 @@
+#include "histo.h"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(){
+    
+
+    waitKey();
+    return 0;
+}
diff --git a/ora6/proj3/.clangd b/ora6/proj3/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/proj3/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/proj3/Makefile b/ora6/proj3/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/proj3/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/proj3/histo.cpp b/ora6/proj3/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/proj3/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/proj3/histo.h b/ora6/proj3/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/proj3/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/proj3/main.cpp b/ora6/proj3/main.cpp
new file mode 100644
index 0000000..d20cd44
--- /dev/null
+++ b/ora6/proj3/main.cpp
@@ -0,0 +1,26 @@
+#include "histo.h"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(){
+    Mat img = imread("dark_img.jpg", IMREAD_GRAYSCALE);
+    imshow("img", img);
+    Histo::showHisto(img);
+
+    double ah, fh;
+    minMaxLoc(img, &ah, &fh);
+
+    fh = 30;
+
+    Mat dest = (ah == fh) ? img.clone() : (img-ah) * 255 / (fh-ah);
+
+    imshow("dest", dest);
+    Histo::showHisto(dest, "eredmeny");
+
+    waitKey();
+    return 0;
+}
diff --git a/ora6/proj4/.clangd b/ora6/proj4/.clangd
new file mode 100644
index 0000000..5f1474c
--- /dev/null
+++ b/ora6/proj4/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-I/usr/include/opencv4, -std=c++17]
diff --git a/ora6/proj4/Makefile b/ora6/proj4/Makefile
new file mode 100644
index 0000000..a350518
--- /dev/null
+++ b/ora6/proj4/Makefile
@@ -0,0 +1,18 @@
+CXX = g++
+CXXFLAGS = -Wall -O2 `pkg-config --cflags opencv4`
+LIBS = `pkg-config --libs opencv4`
+
+SRC = $(wildcard *.cpp)
+OBJ = $(SRC:.cpp=.o)
+TARGET = main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(OBJ) -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET)
diff --git a/ora6/proj4/histo.cpp b/ora6/proj4/histo.cpp
new file mode 100644
index 0000000..42352bc
--- /dev/null
+++ b/ora6/proj4/histo.cpp
@@ -0,0 +1,126 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+*/
+
+#include <iostream>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include "histo.h"
+
+using namespace std;
+using namespace cv;
+
+void Histo::calcHistoC1(const cv::Mat img, cv::Mat& histo) {
+	assert(img.type() == CV_8UC1);
+
+	// CV_32U nem letezik, ha de CV_16U-t (ushort) hasznalhatsz, ha akarsz.
+	histo = Mat::zeros(256, 1, CV_32S);
+	for (int i = 0; i < img.rows; i++)
+		for (int j = 0; j < img.cols; j++)
+			histo.at<int>(img.at<uchar>(i, j))++;
+}
+
+
+void Histo::calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo_vect) {
+	assert(img.type() == CV_8UC3);
+
+	vector<Mat> chs;
+	split(img.clone(), chs);
+
+	Mat h0, h1, h2;
+	Histo::calcHistoC1(chs[0], h0);
+	Histo::calcHistoC1(chs[1], h1);
+	Histo::calcHistoC1(chs[2], h2);
+
+	histo_vect.clear();
+	histo_vect.push_back(h0);
+	histo_vect.push_back(h1);
+	histo_vect.push_back(h2);
+}
+
+
+
+void Histo::drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel) {
+	assert(histo.type() == CV_32S);
+
+	int pad = 10;
+	canvas = Mat::zeros(200 + 2 * pad, 256 + 2 * pad, CV_8UC3);
+	
+	// a hisztogram alatti szurke sav rajzolasa 
+	for (int i = 0; i < 10; ++i) {  // 10 pixel vastag lesz, hogy jol latszodjon
+		for (int j = 0; j < 256; ++j) {
+			if (0 <= channel && channel <= 2) {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad)[channel] = j;
+			}
+			else {
+				canvas.at<Vec3b>(canvas.rows - 1 - i, j + pad) = Vec3b(j, j, j);
+			}
+		}
+	}
+	
+
+	Vec3b color(255, 255, 255);
+	if (0 <= channel && channel <= 2) {
+		color = Vec3b(0, 0, 0);
+		color[channel] = 255;
+	}
+
+
+	double minv, maxv;
+	minMaxLoc(histo, &minv, &maxv);
+	
+	double scale = 200 / maxv;  // az ablak magassagahoz igazitom a hisztogram magassagat
+
+	// a hisztogram rajzolasa
+	for (int i = 0; i < 256; ++i) {
+		// egy oszlop magassage (a line(Point(0, 0), Point(0, 1)) 2 pixelt rajzolna, ezert a -1)
+		int v = int(histo.at<int>(i) * scale) - 1; 
+		// canvas.rows-2-pad oldja meg, hogy a szurke sav felett kezdjuk a rajzolast
+		if (v >= 0)
+			line(canvas, Point(pad + i, canvas.rows - 2 - v - pad), Point(pad + i, canvas.rows - 2 - pad), color);
+	}
+}
+
+
+void Histo::drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases) {
+	assert(histos.size() == 3 && 
+		   histos[0].type() == CV_32S && histos[1].type() == CV_32S && histos[2].type() == CV_32S);
+
+	canvases.clear();
+	for (int i = 0; i <= 2; ++i) {
+		Mat canvas;
+		Histo::drawHistoC1(histos[i], canvas, i);
+		canvases.push_back(canvas.clone());
+	}
+}
+
+
+void Histo::showHisto(Mat img, string title, int wait) {
+	assert(img.type() == CV_8UC1 || img.type() == CV_8UC3);
+
+	if (img.type() == CV_8UC1) {
+		Mat histo;
+		Histo::calcHistoC1(img, histo);
+
+		// az ertekek konzolra iratasa
+		//cout << histo << endl;
+
+		Mat canvas;
+		Histo::drawHistoC1(histo, canvas);
+		imshow(title, canvas);
+	}
+	else if (img.type() == CV_8UC3) {
+		vector<Mat> histos;
+		Histo::calcHistoC3(img, histos);
+
+		vector<Mat> canvases;
+		Histo::drawHistoC3(histos, canvases);
+
+		string str = "BGR";
+		for (int i = 0; i <= 2; ++i) {
+			imshow(title + "-" + str[i], canvases[i]);
+		}
+	}
+	waitKey(wait);
+}
diff --git a/ora6/proj4/histo.h b/ora6/proj4/histo.h
new file mode 100644
index 0000000..9178101
--- /dev/null
+++ b/ora6/proj4/histo.h
@@ -0,0 +1,32 @@
+/*
+Kepfeld. gyak. - nehany segedfuggveny az orai anyag konnyebb szemleltetesehez.
+   1 es 3 csatornas, csatornankent 8 bites kepekre:
+   Histo::showHisto(img);
+*/
+#ifndef HISTO_H_
+#define HISTO_H_
+
+#include <vector>
+#include <opencv2/core.hpp>
+
+using namespace std;
+using namespace cv;
+
+namespace Histo {
+	void calcHistoC1(const cv::Mat img, cv::Mat& histo);
+	void calcHistoC3(const cv::Mat img, vector<cv::Mat>& histo);
+
+	void drawHistoC1(const cv::Mat histo, cv::Mat& canvas, int channel = -1);
+	void drawHistoC3(const vector<cv::Mat> histos, vector<cv::Mat>& canvases);
+
+	/// <summary>
+	/// Egy kep hisztogramjanak megjelenitese. 
+	/// </summary>
+	/// <param name="img">1 vagy 3 csatornas input kep</param>
+	/// <param name="title">ablaknev</param>
+	/// <param name="wait">varakoztatas</param>
+	void showHisto(Mat img, string title = "histo", int wait = 0);
+};
+
+
+#endif HISTO_H_
diff --git a/ora6/proj4/main.cpp b/ora6/proj4/main.cpp
new file mode 100644
index 0000000..d20cd44
--- /dev/null
+++ b/ora6/proj4/main.cpp
@@ -0,0 +1,26 @@
+#include "histo.h"
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(){
+    Mat img = imread("dark_img.jpg", IMREAD_GRAYSCALE);
+    imshow("img", img);
+    Histo::showHisto(img);
+
+    double ah, fh;
+    minMaxLoc(img, &ah, &fh);
+
+    fh = 30;
+
+    Mat dest = (ah == fh) ? img.clone() : (img-ah) * 255 / (fh-ah);
+
+    imshow("dest", dest);
+    Histo::showHisto(dest, "eredmeny");
+
+    waitKey();
+    return 0;
+}
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