diff --git a/src/Rectangle/BoundTracker.cpp b/src/Rectangle/BoundTracker.cpp
index d66f22f..2c174b2 100755
--- a/src/Rectangle/BoundTracker.cpp
+++ b/src/Rectangle/BoundTracker.cpp
@@ -1,6 +1,6 @@
 #include "BoundTracker.h"
 
-BoundTracker::BoundTracker(int *lastKey, UI *ui) {
+BoundTracker::BoundTracker(std::shared_ptr<int> lastKey, std::shared_ptr<UI> ui) {
 	BoundTracker::lastKey = lastKey;
 	BoundTracker::ui = ui;
 }
diff --git a/src/Rectangle/BoundTracker.h b/src/Rectangle/BoundTracker.h
index cfba046..5e99aaf 100755
--- a/src/Rectangle/BoundTracker.h
+++ b/src/Rectangle/BoundTracker.h
@@ -3,18 +3,19 @@
 #include <opencv2/opencv.hpp>
 #include <opencv2/tracking.hpp>
 #include "../UI.h"
+#include <memory>
 
 class BoundTracker {
-	int *lastKey;
-	UI *ui;
+	std::shared_ptr<int> lastKey;
+	std::shared_ptr<UI> ui;
 	cv::Rect2d roi;
 	unsigned queueSize = 20;
 	std::deque<cv::Rect2d> deadConsistency;
 
-	cv::Ptr<cv::Tracker> tracker = cv::TrackerKCF::create();;
+	cv::Ptr<cv::Tracker> tracker = cv::TrackerKCF::create();
 
 public:
-	BoundTracker(int *lastKey, UI *ui);
+	BoundTracker(std::shared_ptr<int> lastKey, std::shared_ptr<UI> ui);
 	void init(cv::Rect2d roi);
 	bool track();
 	void setROI(cv::Rect2d roi);
diff --git a/src/Rectangle/Confidence.cpp b/src/Rectangle/Confidence.cpp
index 90ad821..bb9b8eb 100755
--- a/src/Rectangle/Confidence.cpp
+++ b/src/Rectangle/Confidence.cpp
@@ -1,6 +1,6 @@
 #include "Confidence.h"
 
-Confidence::Confidence(int *lastKey, UI *ui, unsigned validityLength, float similarity) {
+Confidence::Confidence(std::shared_ptr<int> lastKey, std::shared_ptr<UI> ui, unsigned validityLength, float similarity) {
 	queueLength = validityLength;
 	this->lastKey = lastKey;
 	this->ui = ui;
diff --git a/src/Rectangle/Confidence.h b/src/Rectangle/Confidence.h
index 266dd43..fd6e706 100755
--- a/src/Rectangle/Confidence.h
+++ b/src/Rectangle/Confidence.h
@@ -4,12 +4,13 @@
 #include <queue>
 #include <vector>
 #include "../UI.h"
+#include <memory>
 
 class Confidence {
 	float similarity;
 	unsigned queueLength = 0;
-	int *lastKey;
-	UI *ui;
+	std::shared_ptr<int> lastKey;
+	std::shared_ptr<UI> ui;
 	bool drawBounds = false;
 	cv::Scalar boundColor {30, 30, 255};
 
@@ -17,7 +18,7 @@ public:
 	std::deque<std::vector<cv::Rect>> confidenceQueue;
 	std::vector<cv::Rect> confident;
 
-	Confidence(int *lastKey, UI *ui, unsigned history = 5, float similarity = 0.75);
+	Confidence(std::shared_ptr<int> lastKey, std::shared_ptr<UI> ui, unsigned history = 5, float similarity = 0.75);
 	bool check(std::vector<cv::Rect> contours);
 	std::vector<cv::Rect> rectangleBounds() const;
 	void drawBoundsOnMat(cv::Mat &mat);
diff --git a/src/Rectangle/ContourAnalyzer.cpp b/src/Rectangle/ContourAnalyzer.cpp
index 4381ed9..919d77d 100755
--- a/src/Rectangle/ContourAnalyzer.cpp
+++ b/src/Rectangle/ContourAnalyzer.cpp
@@ -3,7 +3,7 @@
 #include "../UI.h"
 #include <algorithm>
 
-ContourAnalyzer::ContourAnalyzer(UI *ui, int *lastKey) {
+ContourAnalyzer::ContourAnalyzer(std::shared_ptr<UI> ui, std::shared_ptr<int> lastKey) {
 	this->ui = ui;
 	ui->UIListeners.push_back(this);
 	this->lastKey = lastKey;
@@ -46,30 +46,8 @@ void ContourAnalyzer::removeRedundancy() {
 		if ((cv::contourArea(contours[i]) > minSize) && (cv::contourArea(contours[i]) < (ui->currentFrame(0)->cols * ui->currentFrame(0)->rows) -25)) {
 			double perimeter = cv::arcLength(contours[i], true);
 			cv::approxPolyDP(contours[i], contours[i], (epsilon/(float)1000)*perimeter, true);
-
 			if ((contours[i].size() == 4) && (cv::isContourConvex(contours[i]))) {
-				if (prunedContours.size() != 0) {
-					bool different = true;
-					for (unsigned comparedTo = 0; comparedTo < prunedContours.size(); comparedTo++) {
-						cv::Moments m1 = cv::moments(prunedContours[comparedTo]);
-						int cx1 = (m1.m10/m1.m00);
-						int cy1 = (m1.m01/m1.m00);
-
-						cv::Moments m2 = cv::moments(contours[i]);
-						int cx2 = (m2.m10/m2.m00);
-						int cy2 = (m2.m01/m2.m00);
-
-						if ((std::abs(cx1 - cx2) < 3) && (std::abs(cy1 - cy2) < 3)) {
-							different = false;
-							break;
-						}
-					}
-					if (different) {
-						prunedContours.insert(prunedContours.begin(), contours[i]);
-					}
-				} else {
-					prunedContours.insert(prunedContours.begin(), contours[i]);
-				}
+				prunedContours.push_back(contours[i]);
 			}
 
 		}
diff --git a/src/Rectangle/ContourAnalyzer.h b/src/Rectangle/ContourAnalyzer.h
index c61c0a2..cbf7b15 100755
--- a/src/Rectangle/ContourAnalyzer.h
+++ b/src/Rectangle/ContourAnalyzer.h
@@ -1,21 +1,15 @@
-/*
- * ContourAnalyzer.h
- *
- *  Created on: Apr 22, 2018
- *      Author: Yunyang
- */
-
 #ifndef RECTANGLE_DETECTION_CONTOURANALYZER_H_
 #define RECTANGLE_DETECTION_CONTOURANALYZER_H_
 #include <string>
 #include <opencv2/opencv.hpp>
 #include "../UI.h"
 #include "../UIListener.hpp"
+#include <memory>
 
 class ContourAnalyzer: public UIListener {
-	int *lastKey;
+	std::shared_ptr<int> lastKey;
 	bool cannyRec = false, drawContours = false;
-	UI *ui;
+	std::shared_ptr<UI> ui;
 	std::vector<std::vector<cv::Point>> contours;
 	std::vector<std::vector<cv::Point>> inconsistentContours;
 	std::vector<std::vector<cv::Point>> consistentContours;
@@ -29,13 +23,13 @@ public:
 	int binLower = 54;
 
 	int minSize = 0;
-	int minSizeScale = 18;
-	int cannyLower = 45;
+	int minSizeScale = 10;
+	int cannyLower = 42;
 	int cannyUpper = 3*cannyLower;
 
 	int epsilon = 56;
 
-	ContourAnalyzer(UI* ui, int *lastKey);
+	ContourAnalyzer(std::shared_ptr<UI> ui, std::shared_ptr<int> lastKey);
 	virtual ~ContourAnalyzer();
 	cv::Scalar selectColor { 0, 255, 0 };
 	cv::Scalar fontColor { 0, 0, 255 };
diff --git a/src/Rectangle/Ruler.cpp b/src/Rectangle/Ruler.cpp
index 0c32c85..2f0d0fd 100755
--- a/src/Rectangle/Ruler.cpp
+++ b/src/Rectangle/Ruler.cpp
@@ -1,32 +1,30 @@
 #include "Ruler.h"
 #include <sstream>
 
-Ruler::Ruler(UI *ui, int *lastKey) {
+Ruler::Ruler(std::shared_ptr<UI> ui, std::shared_ptr<int> lastKey) {
 	this->ui = ui;
 	this->lastKey = lastKey;
 }
 
 void Ruler::update() {
-	focalLength = estimateFocalLength(HFOV);
-	distance = estimateDistance(rect);
+	focalLength = estimateFocalLength();
+	distance = estimateDistance();
 	inputUpdate();
 	updateUI();
 }
 
-float Ruler::estimateFocalLength(float HFOV) {
+float Ruler::estimateFocalLength() {
 	float fl = (ui->getWidth()/2.0) * (cos((HFOV * M_PI)/(180*2.0))/sin(HFOV*M_PI/(180*2.0)));
 	return fl;
 }
 
 void Ruler::updateUI() {
 	if (inputtingVal) {
-		cv::putText(*(ui->drawnFrame()), ("Given width: " + std::to_string(givenWidth)), confTextPos, cv::FONT_HERSHEY_PLAIN, 0.7, textFontColor, 2);
+		cv::putText(*(ui->drawnFrame()), ("Given width: " + std::to_string(givenWidth) + "cm"), confTextPos, cv::FONT_HERSHEY_PLAIN, 0.7, textFontColor, 2);
 	} else {
-		cv::putText(*(ui->drawnFrame()), ("Given width: " + std::to_string(givenWidth)), confTextPos, cv::FONT_HERSHEY_PLAIN, 0.7, textFontColor);
+		cv::putText(*(ui->drawnFrame()), ("Given width: " + std::to_string(givenWidth) + "cm"), confTextPos, cv::FONT_HERSHEY_PLAIN, 0.7, textFontColor);
 	}
 	cv::putText(*(ui->drawnFrame()), ("distance: " + std::to_string(distance) + "cm"), distanceTextPos, cv::FONT_HERSHEY_PLAIN, 0.7, textFontColor);
-
-	std::cout << "focal length: " + std::to_string(focalLength) << std::endl;
 }
 
 void Ruler::toggleInput() {
@@ -38,9 +36,9 @@ void Ruler::toggleInput() {
 	}
 }
 
-int Ruler::estimateDistance(cv::RotatedRect rect) {
-	if (rect.size.area() > 0) {
-		return (givenWidth*focalLength) / rect.size.width;
+int Ruler::estimateDistance() {
+	if (detectedWidth > 0) {
+		return (givenWidth*focalLength) /detectedWidth;
 	} else {
 		return 0;
 	}
@@ -49,11 +47,17 @@ int Ruler::estimateDistance(cv::RotatedRect rect) {
 void Ruler::inputUpdate() {
 	if (*lastKey == 13) {
 		toggleInput();
+		decimal = false;
+
 	}
 	if (inputtingVal) {
 		if (*lastKey >= 48 && *lastKey <= 57) {
 			char val = '0' + (*lastKey - 48);
 			numBuild.push_back(val);
+		} else if (*lastKey == 46 && decimal == false) {
+			char val = '.';
+			numBuild.push_back(val);
+			decimal = true;
 		}
 		if (numBuild.size() > 0) {
 			std::string numString{numBuild.begin(), numBuild.end()};
@@ -62,8 +66,8 @@ void Ruler::inputUpdate() {
 	}
 }
 
-void Ruler::updateRectangle(cv::RotatedRect rect) {
-	this->rect = rect;
+void Ruler::setDetectedWidth(int width) {
+	detectedWidth = width;
 }
 
 void Ruler::componentSetup() {
diff --git a/src/Rectangle/Ruler.h b/src/Rectangle/Ruler.h
index 6290a0a..374ec53 100755
--- a/src/Rectangle/Ruler.h
+++ b/src/Rectangle/Ruler.h
@@ -2,28 +2,30 @@
 #define RECTANGLE_RULER_H_
 #include "../UI.h"
 #include "../UIListener.hpp"
+#include <memory>
 
 class Ruler: public UIListener {
 	cv::Point distanceTextPos {5, 60};
 	cv::Point confTextPos {5, 75};
 	cv::Scalar textFontColor {20, 20, 20};
 
-	cv::RotatedRect rect;
-	UI *ui;
-	int *lastKey;
+	bool decimal = false;
+	int detectedWidth = 0;
+	std::shared_ptr<UI> ui;
+	std::shared_ptr<int> lastKey;
 	float distance = 0;
 	float givenWidth = 0;
 	float focalLength = 0;
-	float HFOV = 65;
+	float HFOV = 60;
 	bool inputtingVal = false;
 	std::deque<char> numBuild;
 
 public:
-	Ruler(UI *ui, int *lastKey);
-	float estimateFocalLength(float HFOV);
-	int estimateDistance(cv::RotatedRect rect);
+	Ruler(std::shared_ptr<UI> ui, std::shared_ptr<int> lastKey);
+	float estimateFocalLength();
+	int estimateDistance();
 	void update();
-	void updateRectangle(cv::RotatedRect rect);
+	void setDetectedWidth(int width);
 	void componentSetup();
 	void updateUI();
 	void toggleInput();
diff --git a/src/UI.cpp b/src/UI.cpp
index 0060c73..582071a 100755
--- a/src/UI.cpp
+++ b/src/UI.cpp
@@ -3,7 +3,7 @@
 const std::string UI::NORMAL_WINDOW = "Normal";
 const std::string UI::DEBUG_WINDOW = "Debug";
 
-UI::UI(int *lastKey) {
+UI::UI(std::shared_ptr<int> lastKey) {
 	this->lastKey = lastKey;
 }
 
diff --git a/src/UI.h b/src/UI.h
index 904717d..5654d9c 100755
--- a/src/UI.h
+++ b/src/UI.h
@@ -10,12 +10,13 @@
 #include <opencv2/opencv.hpp>
 #include "UIListener.hpp"
 #include "string"
+#include <memory>
 
 class UI {
 	bool debug = false, showSlider = false;
 	unsigned lastDebugFrame = 0;
 	unsigned debugFrame = 0;
-	int *lastKey;
+	std::shared_ptr<int> lastKey;
 	int  width = 0, height = 0;
 	unsigned state = 0;
 	std::vector<cv::Mat> frames = {cv::Mat()};
@@ -27,7 +28,7 @@ public:
 	static const std::string DEBUG_WINDOW;
 
 	std::vector<UIListener *> UIListeners;
-	UI(int *lastKey);
+	UI(std::shared_ptr<int> lastKey);
 	void render();
 	void nextDebugFrame();
 	cv::Mat* nextFrame();
diff --git a/src/main.cpp b/src/main.cpp
index 8f341f1..126a045 100755
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,14 +6,16 @@
 #include "Rectangle/Confidence.h"
 #include "Rectangle/BoundTracker.h"
 #include "Rectangle/Ruler.h"
+#include <memory>
+
 enum State {
 	detection, track, cross_check
 };
 
 State state = detection;
-Webcam webcam = 0;
-int *lastKey = new int(0);
-UI *ui = new UI(lastKey);
+Webcam webcam;
+std::shared_ptr<int> lastKey {new int(0)};
+std::shared_ptr<UI> ui {new UI(lastKey)};
 ContourAnalyzer ca { ui, lastKey };
 Confidence conf { lastKey, ui, 6, 0.78};
 BoundTracker tracker { lastKey, ui };
@@ -39,7 +41,6 @@ void run() {
 					largest = rects[i];
 				}
 			}
-
 			tracker.init(largest);
 			state = track;
 		}
@@ -67,19 +68,16 @@ void run() {
 		ca.analyze(scaledSearchArea);
 
 		ca.convertContoursToBounds();
-		ca.convertContoursToRotatedBounds();
 
 		if (ca.getBounds().size() > 0) {
 			cv::Rect largest;
-			unsigned index;
 			for (unsigned i = 0; i < ca.getBounds().size(); i++) {
 				if (ca.getBounds()[i].area() > largest.area()) {
 					largest = ca.getBounds()[i];
-					index = i;
 				}
 			}
 
-			ruler.updateRectangle(ca.getRotatedBounds()[index]);
+			ruler.setDetectedWidth(largest.width);
 
 			largest.x += scaledSearchArea.x;
 			largest.y += scaledSearchArea.y;
@@ -114,7 +112,7 @@ void run() {
 				frameCount = 0;
 			} else {
 				frameCount++;
-				if (frameCount > 30) {
+				if (frameCount > 20) {
 					state = detection;
 					frameCount = 0;
 				}
@@ -154,8 +152,6 @@ int main(int argc, char** argv) {
 		*lastKey = -1;
 	}
 
-	delete ui;
-	delete lastKey;
 	cv::destroyAllWindows();
 	return 0;
 }
diff --git a/src/webcam/Webcam.cpp b/src/webcam/Webcam.cpp
index 3d32ebe..6b6033e 100755
--- a/src/webcam/Webcam.cpp
+++ b/src/webcam/Webcam.cpp
@@ -1,14 +1,6 @@
-/*
- * Webcam.cpp
- *
- *  Created on: Apr 21, 2018
- *      Author: Yunyang
- */
-
 #include "Webcam.h"
 
-Webcam::Webcam(int webcamID) {
-	stream = new cv::VideoCapture(webcamID);
+Webcam::Webcam() {
 	stream->set(cv::CAP_PROP_FRAME_WIDTH, 1920);
 	stream->set(cv::CAP_PROP_FRAME_HEIGHT, 1080);
 }
@@ -26,6 +18,5 @@ cv::Mat Webcam::getFrame() const {
 }
 
 Webcam::~Webcam() {
-	delete stream;
 }
 
diff --git a/src/webcam/Webcam.h b/src/webcam/Webcam.h
index a5b7dc1..568865c 100755
--- a/src/webcam/Webcam.h
+++ b/src/webcam/Webcam.h
@@ -10,11 +10,11 @@
 #include <opencv2/opencv.hpp>
 
 class Webcam {
-	cv::VideoCapture* stream;
+	std::unique_ptr<cv::VideoCapture> stream {new cv::VideoCapture{0}};
 	cv::Mat frame;
 	bool webcamConnected = false;
 public:
-	Webcam(int webcamID);
+	Webcam();
 	virtual ~Webcam();
 
 	void update();