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March 20, 2019 21:23
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OpenCV Python Tutorial For Beginners - How to Bind Trackbar To OpenCV Windows
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import numpy as np | |
import cv2 as cv | |
def nothing(x): | |
print(x) | |
# Create a black image, a window | |
img = np.zeros((300,512,3), np.uint8) | |
cv.namedWindow('image') | |
cv.createTrackbar('B', 'image', 0, 255, nothing) | |
cv.createTrackbar('G', 'image', 0, 255, nothing) | |
cv.createTrackbar('R', 'image', 0, 255, nothing) | |
switch = '0 : OFF\n 1 : ON' | |
cv.createTrackbar(switch, 'image', 0, 1, nothing) | |
while(1): | |
cv.imshow('image',img) | |
k = cv.waitKey(1) & 0xFF | |
if k == 27: | |
break | |
b = cv.getTrackbarPos('B', 'image') | |
g = cv.getTrackbarPos('G', 'image') | |
r = cv.getTrackbarPos('R', 'image') | |
s = cv.getTrackbarPos(switch, 'image') | |
if s == 0: | |
img[:] = 0 | |
else: | |
img[:] = [b, g, r] | |
cv.destroyAllWindows() |
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import numpy as np | |
import cv2 as cv | |
def nothing(x): | |
print(x) | |
# Create a black image, a window | |
cv.namedWindow('image') | |
cv.createTrackbar('CP', 'image', 10, 400, nothing) | |
switch = 'color/gray' | |
cv.createTrackbar(switch, 'image', 0, 1, nothing) | |
while(1): | |
img = cv.imread('lena.jpg') | |
pos = cv.getTrackbarPos('CP', 'image') | |
font = cv.FONT_HERSHEY_SIMPLEX | |
cv.putText(img, str(pos), (50, 150), font, 6, (0, 0, 255), 10) | |
k = cv.waitKey(1) & 0xFF | |
if k == 27: | |
break | |
s = cv.getTrackbarPos(switch, 'image') | |
if s == 0: | |
pass | |
else: | |
img = cv.cvtColor(img, cv.COLOR_BGR2GRAY) | |
img = cv.imshow('image',img) | |
cv.destroyAllWindows() |
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