Predictive Hacks

Image Processing in OpenCV Python

opencv

We will show how you can apply image processing with OpenCV in Python. We will work with this image obtained from Unsplash.

Image Processing in OpenCV Python 1

How to blur the Image

import cv2
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline

img = cv2.imread('panda.jpeg')
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
blurred_img = cv2.blur(img,ksize=(20,20))
cv2.imwrite("blurredpanda.jpg", blurred_img) 
 
Image Processing in OpenCV Python 2

How to apply Sobel Operator

You can have a look about Sobel Operator at Wikipedia and you can also start experimenting with some filters. Let’s apply the horizontal and vertical Sobel Operator.

img = cv2.imread('panda.jpeg',0)
sobelx = cv2.Sobel(img,cv2.CV_64F,1,0,ksize=5)
sobely = cv2.Sobel(img,cv2.CV_64F,0,1,ksize=5)

cv2.imwrite("sobelx_panda.jpg", sobelx) 
cv2.imwrite("sobely_panda.jpg", sobely) 
 
 
Image Processing in OpenCV Python 3
Image Processing in OpenCV Python 4

How to apply a threshold to an Image

We can also binarize the images.

img = cv2.imread('panda.jpeg',0)
ret,th1 = cv2.threshold(img,100,255,cv2.THRESH_BINARY)
fig = plt.figure(figsize=(12,10))
plt.imshow(th1,cmap='gray')
Image Processing in OpenCV Python 5

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