Created
January 16, 2017 05:40
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OpenCV Thresholding Sliders
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| import cv2 as cv | |
| import sys | |
| minHue = 0 | |
| maxHue = 255 | |
| if (len(sys.argv) == 3): | |
| print("Usage: " + str(sys.argv[1]) + " <imgpath>") | |
| sys.exit() | |
| img = cv.imread(sys.argv[1]) | |
| img = cv.GaussianBlur(img, (3,3), 1, 1) | |
| cvted = cv.cvtColor(img, cv.COLOR_BGR2HSV) | |
| seperated = cv.split(cvted) | |
| hue = seperated[0] | |
| def thresh(): | |
| a, lower = cv.threshold(hue, minHue, 255, cv.THRESH_BINARY) | |
| b, upper = cv.threshold(hue, maxHue, 255, cv.THRESH_BINARY_INV) | |
| result = lower & upper | |
| cv.destroyWindow("Thresholded") | |
| cv.imshow("Thresholded", result) | |
| def changeLower(num): | |
| minHue = num | |
| print("Min Hue: " + str(minHue)) | |
| thresh() | |
| def changeUpper(num): | |
| maxHue = num | |
| print("Max Hue: " + str(maxHue)) | |
| thresh() | |
| cv.namedWindow("Threshold Controls", cv.WINDOW_NORMAL) | |
| cv.createTrackbar("hueMin", "Threshold Controls", minHue, 255, changeLower) | |
| cv.createTrackbar("hueMax", "Threshold Controls", maxHue, 255, changeUpper) | |
| #cv.namedWindow("Thresholded", cv.WINDOW_NORMAL) | |
| thresh() | |
| cv.waitKey(0) |
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