Commit 79593fb

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Merge pull request avinashkranjan#2892 from invigorzz313/perspective

perspective transformation

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	`1`	`+# Perspective Transformation`
	`2`	`+This python script will allow us to change perspective of 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 selects an input image and the script changes its perspective and displays it.`
	`18`	`+(Note The positions of any 4 points (no 3 of them should be collinear) on the original image and the positions where they would be present after the transformation should be specified in the code.`
	`19`	`+`
	`20`	`+## Author`
	`21`	`+Github: invigorzz313`

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	`1`	`+import cv2`
	`2`	`+import numpy as np`
	`3`	`+import tkinter as tk`
	`4`	`+from tkinter.filedialog import *`
	`5`	`+`
	`6`	`+photo = askopenfilename() # reading the input image`
	`7`	`+img = cv2.imread(photo)`
	`8`	`+img = cv2.resize(img,(500,500))`
	`9`	`+`
	`10`	`+window = tk.Tk()`
	`11`	`+window.title("Perspective transform")`
	`12`	`+window.geometry('350x200')`
	`13`	`+`
	`14`	`+`
	`15`	`+# pts1 is an array storing coordinates of 4 points on the original image`
	`16`	`+pts1 = np.float32([[103,97],[390,93],[85,351],[412,352]])`
	`17`	`+# pts2 is an array storing coordinates of 4 positions where the above points should be after the transformation`
	`18`	`+pts2 = np.float32([[103,97],[390,93],[133,400],[390,400]])`
	`19`	`+`
	`20`	`+Mat = cv2.getPerspectiveTransform(pts1,pts2)`
	`21`	`+dst = cv2.warpPerspective(img, Mat, (500,500))`
	`22`	`+`
	`23`	`+label = tk.Label(window, text="Points chosen on original image: " + str(pts1)).grid(row=0, column=1)`
	`24`	`+label = tk.Label(window, text="Points on transformed image: " + str(pts2)).grid(row=1, column=1)`
	`25`	`+label = tk.Label(window, text="The coordinates can be changed in the code ").grid(row=2, column=1)`
	`26`	`+# displaying the images`
	`27`	`+cv2.imshow("Original Image", img)`
	`28`	`+cv2.imshow("Transformed Image", dst)`
	`29`	`+cv2.waitKey(0)`
	`30`	`+cv2.destroyAllWindows()`
	`31`	`+`
	`32`	`+window.mainloop()`

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