learnopencv/Threshold/threshold.py at master · spmallick/learnopencv · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
'''
	OpenCV Threshold Example
  Copyright 2015 by Satya Mallick <spmallick@gmail.com>
'''
# import opencv
import cv2

# Read image
src = cv2.imread("threshold.png", cv2.IMREAD_GRAYSCALE);

# Basic threhold example
th, dst = cv2.threshold(src, 0, 255, cv2.THRESH_BINARY);
cv2.imwrite("opencv-threshold-example.jpg", dst);

# Thresholding with maxValue set to 128
th, dst = cv2.threshold(src, 0, 128, cv2.THRESH_BINARY);
cv2.imwrite("opencv-thresh-binary-maxval.jpg", dst);

# Thresholding with threshold value set 127
th, dst = cv2.threshold(src,127,255, cv2.THRESH_BINARY);
cv2.imwrite("opencv-thresh-binary.jpg", dst);

# Thresholding using THRESH_BINARY_INV
th, dst = cv2.threshold(src,127,255, cv2.THRESH_BINARY_INV);
cv2.imwrite("opencv-thresh-binary-inv.jpg", dst);

# Thresholding using THRESH_TRUNC
th, dst = cv2.threshold(src,127,255, cv2.THRESH_TRUNC);
cv2.imwrite("opencv-thresh-trunc.jpg", dst);

# Thresholding using THRESH_TOZERO
th, dst = cv2.threshold(src,127,255, cv2.THRESH_TOZERO);
cv2.imwrite("opencv-thresh-tozero.jpg", dst);

# Thresholding using THRESH_TOZERO_INV
th, dst = cv2.threshold(src,127,255, cv2.THRESH_TOZERO_INV);
cv2.imwrite("opencv-thresh-to-zero-inv.jpg", dst);