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border extraction

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	`1`	`+import cv2`
	`2`	`+import numpy as np`
	`3`	`+import tkinter as tk`
	`4`	`+from tkinter.filedialog import *`
	`5`	`+`
	`6`	`+window = tk.Tk()`
	`7`	`+window.title("Border extraction")`
	`8`	`+window.geometry('300x100')`
	`9`	`+label = tk.Label(window, text="Choose an image").grid(row=0, column=0)`
	`10`	`+`
	`11`	`+photo = askopenfilename()`
	`12`	`+img = cv2.imread(photo)`
	`13`	`+n,l,m = img.shape`
	`14`	`+size = (n,l)`
	`15`	`+gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)`
	`16`	`+`
	`17`	`+threshold_value = 20 # this value needs to be adjusted for every image`
	`18`	`+ret, thresh = cv2.threshold(gray, threshold_value, 255, 0)`
	`19`	`+`
	`20`	`+kernel = np.ones((5,5),np.uint8)`
	`21`	`+# dilation and erosion are applied to binary images`
	`22`	`+dilated = cv2.dilate(thresh, kernel, iterations=1)`
	`23`	`+eroded = cv2.erode(thresh, kernel, iterations=1)`
	`24`	`+`
	`25`	`+bordered = dilated - eroded`
	`26`	`+bordered = cv2.resize(bordered, size)`
	`27`	`+cv2.imshow("Border/outline", bordered)`
	`28`	`+cv2.imwrite("Output.png", bordered)`
	`29`	`+cv2.waitKey(0)`
	`30`	`+cv2.destroyAllWindows()`
	`31`	`+`
	`32`	`+window.mainloop()`

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	`1`	`+# Border extraction`
	`2`	`+This python script will allow us to extract borders of objects in an image.`
	`3`	`+`
	`4`	`+## Setup Instructions`
	`5`	`+### Install python3`
	`6`	`+sudo apt-get install python3`
	`7`	`+### Install pip (package installer for python)`
	`8`	`+sudo apt-get install python3-pip`
	`9`	`+### Install Numpy library with pip`
	`10`	`+pip3 install numpy`
	`11`	`+### Install OpenCV library with pip`
	`12`	`+pip3 install opencv-python`
	`13`	`+### Install tkinter library`
	`14`	`+sudo apt-get install python3-tk`
	`15`	`+`
	`16`	`+## Details/Output`
	`17`	`+User should select an image and the script returns an output image of borders of the objects in it.`
	`18`	`+The input image is converted into binary format and then we use morphological transformation of dilation minus erosion.`
	`19`	`+Note The threshold value while converting an image into binary format needs to be adjusted for every image.`
	`20`	`+`
	`21`	`+## Author`
	`22`	`+Github: invigorzz313`

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