To perform edge detection using Sobel, Laplacian, and Canny edge detectors.
Anaconda - Python 3.7
Import the required packages for further process.
Read the image and convert the bgr image to gray scale image.
Use gaussian filter for smoothing the image to reduce the noise.
Apply the respective filters - Sobel, Laplacian edge dectector and Canny edge dector.
Display the filtered image using plot and imshow.
Developed by : SITHI HAJARA I
Reg no : 212221230102
import numpy as np
import cv2
import matplotlib.pyplot as plt
input_image = cv2.imread("pup.jpeg")
input_image = cv2.cvtColor(input_image,cv2.COLOR_BGR2RGB)
plt.axis('off')
plt.imshow(input_image)
plt.show()
sobelx = cv2.Sobel(new_image,cv2.CV_64F,1,0,ksize = 5)
plt.figure(figsize=(8,8))
plt.subplot(1,2,1)
plt.imshow(new_image,cmap = 'RdPu')
plt.title('RdPu')
plt.subplot(1,2,2)
plt.imshow(sobelx,cmap = 'RdPu')
plt.title("Sobel X")
plt.xticks([])
plt.yticks([])
plt.show()
sobely = cv2.Sobel(new_image,cv2.CV_64F,0,1,ksize = 5)
plt.figure(figsize = (8,8))
plt.subplot(1,2,1)
plt.imshow(new_image,cmap = 'OrRd')
plt.title('OrRd')
plt.subplot(1,2,2)
plt.imshow(sobely,cmap = 'OrRd')
plt.title("Sobel Y")
plt.xticks([])
plt.yticks([])
plt.show()
sobelxy = cv2.Sobel(new_image,cv2.CV_64F,1,1,ksize=5)
plt.figure(figsize = (8,8))
plt.subplot(1,2,1)
plt.imshow(new_image,cmap = 'BuPu')
plt.title('BuPu')
plt.subplot(1,2,2)
plt.imshow(sobelxy,cmap = 'BuPu')
plt.title('Sobel XY')
plt.xticks([])
plt.yticks([])
plt.show()
laplacian = cv2.Laplacian(new_image,cv2.CV_64F)
plt.figure(figsize = (8,8))
plt.subplot(1,2,1)
plt.imshow(new_image,cmap = 'bone')
plt.title('bone')
plt.subplot(1,2,2)
plt.imshow(laplacian,cmap = 'bone')
plt.title('Laplacian')
plt.xticks([])
plt.yticks([])
plt.show()
canny_edge = cv2.Canny(new_image,120,150)
plt.figure(figsize = (8,8))
plt.subplot(1,2,1)
plt.imshow(new_image,cmap = 'gist_gray')
plt.title('gist_gray')
plt.subplot(1,2,2)
plt.imshow(canny_edge,cmap = 'gist_gray')
plt.title('Canny Edges')
plt.xticks([])
plt.yticks([])
plt.show()
Thus the edges are detected using Sobel, Laplacian, and Canny edge detectors.