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August 3, 2020 12:46
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OpenCV Python Tutorial For Beginners - Object Detection and Object Tracking Using HSV Color Space
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import cv2 | |
import numpy as np | |
def nothing(x): | |
pass | |
cv2.namedWindow("Tracking") | |
cv2.createTrackbar("LH", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("LS", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("LV", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("UH", "Tracking", 255, 255, nothing) | |
cv2.createTrackbar("US", "Tracking", 255, 255, nothing) | |
cv2.createTrackbar("UV", "Tracking", 255, 255, nothing) | |
while True: | |
frame = cv2.imread('smarties.png') | |
hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) | |
l_h = cv2.getTrackbarPos("LH", "Tracking") | |
l_s = cv2.getTrackbarPos("LS", "Tracking") | |
l_v = cv2.getTrackbarPos("LV", "Tracking") | |
u_h = cv2.getTrackbarPos("UH", "Tracking") | |
u_s = cv2.getTrackbarPos("US", "Tracking") | |
u_v = cv2.getTrackbarPos("UV", "Tracking") | |
l_b = np.array([l_h, l_s, l_v]) | |
u_b = np.array([u_h, u_s, u_v]) | |
mask = cv2.inRange(hsv, l_b, u_b) | |
res = cv2.bitwise_and(frame, frame, mask=mask) | |
cv2.imshow("frame", frame) | |
cv2.imshow("mask", mask) | |
cv2.imshow("res", res) | |
key = cv2.waitKey(1) | |
if key == 27: | |
break | |
cv2.destroyAllWindows() |
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import cv2 | |
import numpy as np | |
def nothing(x): | |
pass | |
cap = cv2.VideoCapture(0); | |
cv2.namedWindow("Tracking") | |
cv2.createTrackbar("LH", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("LS", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("LV", "Tracking", 0, 255, nothing) | |
cv2.createTrackbar("UH", "Tracking", 255, 255, nothing) | |
cv2.createTrackbar("US", "Tracking", 255, 255, nothing) | |
cv2.createTrackbar("UV", "Tracking", 255, 255, nothing) | |
while True: | |
#frame = cv2.imread('smarties.png') | |
_, frame = cap.read() | |
hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) | |
l_h = cv2.getTrackbarPos("LH", "Tracking") | |
l_s = cv2.getTrackbarPos("LS", "Tracking") | |
l_v = cv2.getTrackbarPos("LV", "Tracking") | |
u_h = cv2.getTrackbarPos("UH", "Tracking") | |
u_s = cv2.getTrackbarPos("US", "Tracking") | |
u_v = cv2.getTrackbarPos("UV", "Tracking") | |
l_b = np.array([l_h, l_s, l_v]) | |
u_b = np.array([u_h, u_s, u_v]) | |
mask = cv2.inRange(hsv, l_b, u_b) | |
res = cv2.bitwise_and(frame, frame, mask=mask) | |
cv2.imshow("frame", frame) | |
cv2.imshow("mask", mask) | |
cv2.imshow("res", res) | |
key = cv2.waitKey(1) | |
if key == 27: | |
break | |
cap.release() | |
cv2.destroyAllWindows() |
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