To segment the image using global thresholding, adaptive thresholding and Otsu's thresholding using python and OpenCV.
- Anaconda - Python 3.7
- OpenCV
Load the necessary packages.
Read the Image and convert to grayscale.
Use Global thresholding to segment the image.
Use Adaptive thresholding to segment the image.
Use Otsu's method to segment the image.
Display the results.
## Program
Program:
Developed by : M.GUNASEKHAR
Register Number : 212221240014
## Load the necessary packages:
import cv2
import numpy as np
import matplotlib.pyplot as plt
### Read the Image and convert to grayscale:
image=cv2.imread("image.jpg",1)
image=cv2.cvtColor(image,cv2.COLOR_BGR2RGB)
image_gray=cv2.imread("image.jpg",0)
### Use Global thresholding to segment the image:
ret,thresh_img1=cv2.threshold(image_gray,86,255,cv2.THRESH_BINARY)
ret,thresh_img2=cv2.threshold(image_gray,86,255,cv2.THRESH_BINARY_INV)
ret,thresh_img3=cv2.threshold(image_gray,86,255,cv2.THRESH_TOZERO)
ret,thresh_img4=cv2.threshold(image_gray,86,255,cv2.THRESH_TOZERO_INV)
ret,thresh_img5=cv2.threshold(image_gray,100,255,cv2.THRESH_TRUNC)
### Use Adaptive thresholding to segment the image:
thresh_img7=cv2.adaptiveThreshold(image_gray,255,cv2.ADAPTIVE_THRESH_MEAN_C,cv2.THRESH_BINARY,11,2)
thresh_img8=cv2.adaptiveThreshold(image_gray,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY,11,2)
### Use Otsu's method to segment the image:
ret,thresh_img6=cv2.threshold(image_gray,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU)
### Display the results:
titles=["Gray Image","Threshold Image (Binary)","Threshold Image (Binary Inverse)","Threshold Image (To Zero)"
,"Threshold Image (To Zero-Inverse)","Threshold Image (Truncate)","Otsu","Adaptive Threshold (Mean)","Adaptive Threshold (Gaussian)"]
images=[image_gray,thresh_img1,thresh_img2,thresh_img3,thresh_img4,thresh_img5,thresh_img6,thresh_img7,thresh_img8]
for i in range(0,9):
plt.figure(figsize=(10,10))
plt.subplot(1,2,1)
plt.title("Original Image")
plt.imshow(image)
plt.axis("off")
plt.subplot(1,2,2)
plt.title(titles[i])
plt.imshow(cv2.cvtColor(images[i],cv2.COLOR_BGR2RGB))
plt.axis("off")
plt.show()
Thus the images are segmented using global thresholding, adaptive thresholding and optimum global thresholding using python and OpenCV.