opencv Image Processing Thresholding
Example
In Python:
import cv2
image_path= 'd:/contour.png'
img = cv2.imread(image_path)
#display image before thresholding
cv2.imshow('I am an image display window',img)
cv2.waitKey(0)
#convert image to gray scale - needed for thresholding
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
#apply threshold to gray image to obtain binary image
threshold=150 #value above which pixel values will be set to max_value
max_value=255 #value to which pixels above threshold will be set
threshold_stype=cv2.THRESH_BINARY #default threshold method
ret, img_binary = cv2.threshold(img_gray, threshold, max_value, threshold_stype)
#display image after thresholding
cv2.imshow('image after applying threshold',img_binary)
cv2.waitKey(0)
#save the binary image
cv2.imwrite('d:/binary.png',img_binary)
cv2.destroyAllWindows()
