diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a1949c..49b8785 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ set(LIBRARY_DEPS ${OpenCV_LIBS})
 add_subdirectory(sample_template)
 # Add you directory here
 # add_subdirectory(sample_YOUR_NAME)
+add_subdirectory(sample_Kozitsin)
 
 # REPORT
 message( STATUS "")
diff --git a/sample_Kozitsin/CMakeLists.txt b/sample_Kozitsin/CMakeLists.txt
new file mode 100644
index 0000000..5479157
--- /dev/null
+++ b/sample_Kozitsin/CMakeLists.txt
@@ -0,0 +1,7 @@
+set(target "sample_Kozitsin")
+
+file(GLOB hdrs "*.hpp")
+file(GLOB srcs "*.cpp")
+
+add_executable(${target} ${srcs} ${hdrs})
+target_link_libraries(${target} ${LIBRARY_DEPS})
diff --git a/sample_Kozitsin/application.cpp b/sample_Kozitsin/application.cpp
new file mode 100644
index 0000000..1694cbc
--- /dev/null
+++ b/sample_Kozitsin/application.cpp
@@ -0,0 +1,240 @@
+#include "application.hpp"
+#include "processing.hpp"
+
+#include <opencv2/highgui/highgui.hpp>
+
+using namespace cv;
+
+int Application::parseArguments(int argc, const char **argv, 
+        Application::Parameters &params)
+{
+    if (argc < 2)
+    {
+        return 1;
+    }
+    params.imgFileName = std::string(argv[1]);
+    return 0;
+}
+
+int Application::getFrame(const std::string &fileName, Mat& src)
+{
+    src = imread(fileName);
+    if (src.empty())
+    {
+        return 1;
+    }
+    return 0;
+}
+
+int Application::processFrameMedian(const Mat& src, Mat& dst)
+{
+    processor.processFrameMedian(src, dst);
+
+    if (dst.empty())
+    {
+        return 1;
+    }
+
+    return 0;
+}
+
+int Application::processFrameGrey(const Mat& src, Mat& dst)
+{
+    processor.processFrameGrey(src, dst);
+
+    if (dst.empty())
+    {
+        return 1;
+    }
+
+    return 0;
+}
+
+int Application::processFramePixel(const cv::Mat& src, cv::Mat& dst)
+{
+    processor.processFramePixel(src, dst);
+
+    if (dst.empty())
+    {
+        return 1;
+    }
+
+    return 0;    
+}
+
+int Application::processFrameCanny(const Mat& src, Mat& dst)
+{
+    processor.processFrameCanny(src, dst);
+
+    if (dst.empty())
+    {
+        return 1;
+    }
+
+    return 0;
+}
+
+int Application::drawButtons(Mat &display)
+{
+    guiState.onButtonPlace = Rect(20, display.rows - 60, 120, 40);
+    guiState.offButtonPlace = Rect(160, display.rows - 60, 120, 40);
+
+    guiState.saveButtonPlace = Rect(300, display.rows - 60, 120, 40);
+
+    guiState.greyOnButtonPlace = Rect(20, display.rows - 120, 120, 40);
+    guiState.cannyButtonPlace = Rect(160, display.rows - 120, 120, 40);
+    guiState.pixelButtonPlace = Rect(300, display.rows - 120, 120, 40);
+
+    rectangle(display, guiState.onButtonPlace, 
+              Scalar(128, 128, 128), CV_FILLED);
+    rectangle(display, guiState.offButtonPlace, 
+              Scalar(128, 128, 128), CV_FILLED);
+    rectangle(display, guiState.saveButtonPlace,
+              Scalar(128, 128, 128), CV_FILLED);
+
+    rectangle(display, guiState.greyOnButtonPlace,
+              Scalar(128, 128, 128), CV_FILLED);
+    rectangle(display, guiState.cannyButtonPlace,
+              Scalar(128, 128, 128), CV_FILLED);
+    rectangle(display, guiState.pixelButtonPlace,
+              Scalar(128, 128, 128), CV_FILLED);
+
+    putText(display, "median", 
+        Point(guiState.onButtonPlace.x + guiState.onButtonPlace.width / 2 - 15,
+              guiState.onButtonPlace.y + guiState.onButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);
+
+    putText(display, "off", 
+        Point(guiState.offButtonPlace.x + guiState.offButtonPlace.width / 2 - 20,
+              guiState.offButtonPlace.y + guiState.offButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);
+
+    putText(display, "save",
+        Point(guiState.saveButtonPlace.x + guiState.saveButtonPlace.width / 2 - 25,
+              guiState.saveButtonPlace.y + guiState.saveButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);
+
+    putText(display, "grey",
+        Point(guiState.greyOnButtonPlace.x + guiState.greyOnButtonPlace.width / 2 - 25,
+              guiState.greyOnButtonPlace.y + guiState.greyOnButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);
+
+    putText(display, "canny",
+        Point(guiState.cannyButtonPlace.x + guiState.cannyButtonPlace.width / 2 - 25,
+              guiState.cannyButtonPlace.y + guiState.cannyButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);    
+
+    putText(display, "pixel",
+        Point(guiState.pixelButtonPlace.x + guiState.pixelButtonPlace.width / 2 - 25,
+              guiState.pixelButtonPlace.y + guiState.pixelButtonPlace.height / 2 + 10),
+        FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0, 0, 0), 2);         
+    return 0;
+}
+
+int Application::showFrame(const std::string &caption, 
+        const Mat& src, Mat& dst)
+{
+    if (guiState.state == OffFilter)
+    {
+        src.copyTo(dst);
+    }
+    else if (guiState.state == OnFilter)
+    {
+        processFrameMedian(src, dst);
+    }
+    else if (guiState.state == OnGrey)
+    {
+        processFrameGrey(src, dst);
+    }
+    else if (guiState.state == Canny)
+    {
+        processFrameCanny(src, dst);
+    }
+    else if (guiState.state == Pixel)
+    {
+        processFramePixel(src, dst);
+    }
+    else if (guiState.state == Saving)
+    {
+        isSaveEnabled = true;
+        guiState.state = OnFilter;
+    }
+    else
+    {
+        return 1;
+    }
+
+    Mat display(src.rows, src.cols + dst.cols, src.type());
+    Mat srcRoi = display(Rect(0, 0, src.cols, src.rows));
+    src.copyTo(srcRoi);
+    Mat dstRoi = display(Rect(src.cols, 0, dst.cols, dst.rows));
+    dst.copyTo(dstRoi);       
+    
+    if (isSaveEnabled)
+    {
+        imwrite("saving.png", display);
+        isSaveEnabled = false;
+    }
+
+    drawButtons(display);
+    
+    namedWindow(caption);  
+    imshow(caption, display);
+    setMouseCallback(caption, onButtonsOnOffClick, &guiState);
+    char key = waitKey(1);
+
+    return key;
+}
+
+void onButtonsOnOffClick(int eventId, int x, int y, int flags, void *userData)
+{
+    if (eventId != EVENT_LBUTTONDOWN)
+    {
+        return;
+    }
+    Application::GUIElementsState *elems = 
+        (Application::GUIElementsState *)userData;
+
+    if (onButtonClicked(elems->onButtonPlace, x, y))
+    {
+        elems->state = Application::OnFilter;
+        return;
+    }
+    if (onButtonClicked(elems->offButtonPlace, x, y))
+    {
+        elems->state = Application::OffFilter;
+        return;
+    }
+
+    if (onButtonClicked(elems->greyOnButtonPlace, x, y))
+    {
+        elems->state = Application::OnGrey;
+        return;
+    }
+    if (onButtonClicked(elems->cannyButtonPlace, x, y))
+    {
+        elems->state = Application::Canny;
+        return;
+    }
+    if (onButtonClicked(elems->pixelButtonPlace, x, y))
+    {
+        elems->state = Application::Pixel;
+        return;
+    }
+    if (onButtonClicked(elems->saveButtonPlace, x, y))
+    {
+        elems->state = Application::Saving;
+        return;
+    }
+}
+
+bool onButtonClicked(cv::Rect buttonPlace, int x, int y)
+{
+    if (x < buttonPlace.x || x > buttonPlace.x + buttonPlace.width ||
+        y < buttonPlace.y || y > buttonPlace.y + buttonPlace.height)
+    {
+        return false;
+    }
+    return true;
+}
+
diff --git a/sample_Kozitsin/application.hpp b/sample_Kozitsin/application.hpp
new file mode 100644
index 0000000..64475cc
--- /dev/null
+++ b/sample_Kozitsin/application.hpp
@@ -0,0 +1,64 @@
+#pragma once
+
+#include <string>
+#include <iostream>
+#include <opencv2/core/core.hpp>
+
+#include "processing.hpp"
+
+bool onButtonClicked(cv::Rect buttonPlace, int x, int y);
+void onButtonsOnOffClick(int eventId, int x, int y, int flags, void *userData);
+
+class Application
+{
+ public:
+    enum WindowState
+    {
+        OnFilter,
+        OffFilter,
+        Saving,
+        OnGrey,
+        Canny,
+        Pixel
+    };
+    struct Parameters
+    {
+        std::string imgFileName;
+    };
+    struct GUIElementsState
+    {
+        WindowState state;
+        cv::Rect onButtonPlace;
+        cv::Rect offButtonPlace;
+        cv::Rect saveButtonPlace;
+        cv::Rect greyOnButtonPlace;
+        cv::Rect cannyButtonPlace;
+        cv::Rect pixelButtonPlace;
+    };
+
+    int parseArguments(int argc, const char **argv, Parameters &params);
+    int getFrame(const std::string &fileName, cv::Mat& src);
+    int processFrameMedian(const cv::Mat& src, cv::Mat& dst);
+    int processFrameGrey(const cv::Mat& src, cv::Mat& dst);
+    int processFrameCanny(const cv::Mat& src, cv::Mat& dst);
+    int processFramePixel(const cv::Mat& src, cv::Mat& dst);
+
+    int showFrame(const std::string &caption, 
+                  const cv::Mat& src, cv::Mat& dst);
+    friend void onButtonsOnOffClick(int eventId, int x, int y, 
+                                    int flags, void *userData);
+    Application() 
+    { 
+        guiState.state = OnFilter;
+        isSaveEnabled = false;
+    };
+
+ private:
+    Processing processor;
+    GUIElementsState guiState;
+
+    bool isSaveEnabled;
+    int drawButtons(cv::Mat &display);
+    
+    friend bool onButtonClicked(cv::Rect buttonPlace, int x, int y);
+};
diff --git a/sample_Kozitsin/main.cpp b/sample_Kozitsin/main.cpp
new file mode 100644
index 0000000..43ff041
--- /dev/null
+++ b/sample_Kozitsin/main.cpp
@@ -0,0 +1,44 @@
+#include <opencv2/core/core.hpp>
+#include <iostream>
+
+#include "application.hpp"
+
+using namespace std;
+using namespace cv;
+
+enum ErrorCode {
+    OK,
+    WRONG_ARGUMENTS,
+    WRONG_INPUT,
+    CANT_PROCESS
+};
+
+int main(int argc, const char **argv)
+{
+    Application app;
+    Application::Parameters params;
+
+    if (app.parseArguments(argc, argv, params) != 0)
+    {
+        cout << "sample_template <image_name>" << endl;
+        cout << "<image_name> - image name for filtering" << endl;
+        return WRONG_ARGUMENTS;
+    }
+
+    Mat src;
+    if (app.getFrame(params.imgFileName, src) != 0)
+    {
+        cout << "Error: \'src\' image is null or empty!" << endl;
+        return WRONG_INPUT;
+    }
+
+    const std::string caption = "OpenCV Sample";
+    char key = 0;
+    Mat dst(src.rows, src.cols, src.type());
+    while (key != 27) // Esc
+    {
+        key = app.showFrame(caption, src, dst);
+    }
+
+	return OK;
+}
diff --git a/sample_Kozitsin/processing.cpp b/sample_Kozitsin/processing.cpp
new file mode 100644
index 0000000..881d98e
--- /dev/null
+++ b/sample_Kozitsin/processing.cpp
@@ -0,0 +1,159 @@
+#include "processing.hpp"
+
+#include <opencv2/imgproc/imgproc.hpp>
+
+#include <stdlib.h>
+#include <time.h>
+#include <vector>
+#include <iostream>
+
+using std::vector;
+using namespace cv;
+
+void Processing::processFrameMedian(const cv::Mat& src, cv::Mat& dst)
+{
+	srand(time(NULL));
+
+    src.copyTo(dst);
+
+    int x = rand() % src.rows;
+    int y = rand() % src.cols;
+
+    while (x > 400 || y > 400)
+    {
+    	x = rand() % src.rows;
+    	y = rand() % src.cols;
+    }
+
+    cv::Rect region(x, y, 100, 100);
+    Mat roi = dst(region);
+
+    const int kSize = 11;
+    medianBlur(roi, roi, kSize);
+
+    rectangle(dst, region, Scalar(255, 0, 0));
+}
+
+void Processing::processFrameGrey(const cv::Mat& src, cv::Mat& dst)
+{
+	srand(time(NULL));
+
+    src.copyTo(dst);
+
+    int x = rand() % src.rows;
+    int y = rand() % src.cols;
+
+    while (x > 400 || y > 400)
+    {
+    	x = rand() % src.rows;
+    	y = rand() % src.cols;
+    }
+
+    cv::Rect region(x, y, 100, 100);
+    Mat roi = dst(region);
+
+    Mat grey;
+    cvtColor(roi, grey, CV_BGR2GRAY, 1);
+    vector<Mat> channels(3);
+
+    channels[0] = grey;
+    channels[1] = grey;
+    channels[2] = grey;
+
+    merge(channels, roi);
+
+    rectangle(dst, region, Scalar(255, 0, 0));
+}
+
+void Processing::processFrameCanny(const cv::Mat& src, cv::Mat& dst)
+{
+	srand(time(NULL));
+
+    src.copyTo(dst);
+
+    int x = rand() % src.rows;
+    int y = rand() % src.cols;
+
+    while (x > 400 || y > 400)
+    {
+    	x = rand() % src.rows;
+    	y = rand() % src.cols;
+    }
+
+    cv::Rect region(x, y, 100, 100);
+    Mat roi = dst(region);
+
+    Mat edges;
+    Canny(roi, edges, 60, 120);
+    vector<Mat> channels(3);
+
+    channels[0] = edges;
+    channels[1] = edges;
+    channels[2] = edges;
+
+    merge(channels, roi);
+
+    rectangle(dst, region, Scalar(255, 0, 0));	
+}
+
+void Processing::processFramePixel(const cv::Mat& src, cv::Mat& dst)
+{
+	srand(time(NULL));
+
+    src.copyTo(dst);
+
+    int x, y;
+    do
+    {
+    	x = rand() % src.rows;
+    	y = rand() % src.cols;
+    }
+    while (x > 400 || y > 400);
+
+    cv::Rect region(x, y, 100, 100);
+
+    std::cout << region.x << " " << region.y << std::endl;
+
+    Mat roi = dst(region);
+
+    //Mat cir = cv::Mat::zeros(roi.size(), CV_8UC1);
+    int bsize = 10;
+
+    for (int i = 0; i < roi.rows; i += bsize)
+    {
+        for (int j = 0; j < roi.cols; j += bsize)
+        {
+            cv::Rect rect = cv::Rect(j, i, bsize, bsize) & 
+                            cv::Rect(0, 0, roi.cols, roi.rows);
+
+            Mat sub_src(roi, rect);
+            sub_src.setTo(cv::mean(roi(rect)));
+
+/*
+            cv::circle(
+                cir, 
+                cv::Point(j+bsize/2, i+bsize/2), 
+                bsize/2-1, 
+                CV_RGB(255,255,255), -1, CV_AA
+            );
+            */
+        }
+    }
+/*
+    cv::Mat cir_32f;
+    cir.convertTo(cir_32f, CV_32F);
+    cv::normalize(cir_32f, cir_32f, 0, 1, cv::NORM_MINMAX);
+
+    cv::Mat dst_32f;
+    roi.convertTo(dst_32f, CV_32F);
+
+    std::vector<cv::Mat> channels;
+    cv::split(dst_32f, channels);
+    for (int i = 0; i < channels.size(); ++i)
+        channels[i] = channels[i].mul(cir_32f);
+
+    cv::merge(channels, dst_32f);
+    dst_32f.convertTo(roi, CV_8U);
+*/
+    rectangle(dst, region, Scalar(255, 0, 0));
+}
\ No newline at end of file
diff --git a/sample_Kozitsin/processing.hpp b/sample_Kozitsin/processing.hpp
new file mode 100644
index 0000000..619401a
--- /dev/null
+++ b/sample_Kozitsin/processing.hpp
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <opencv2/core/core.hpp>
+
+class Processing
+{
+ public:
+    void processFrameMedian(const cv::Mat& src, cv::Mat& dst);
+    void processFrameGrey(const cv::Mat& src, cv::Mat& dst);
+    void processFrameCanny(const cv::Mat& src, cv::Mat& dst);
+    void processFramePixel(const cv::Mat& src, cv::Mat& dst);
+};