import numpy as np
import time, sys, cv2
img = cv2.imread('2-60.JPG')
cv2.imshow('Original',img)
# get a blank pntscanvas for drawing points on
pntscanvas = np.zeros(img.shape, np.uint8)
print (sys.version)
if sys.version_info[0] < 3:
raise Exception("Python 3 or a more recent version is required.")
def doredo():
start_time = time.time()
# Use kmeans to convert to 2 color image
hsv_img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
Z = hsv_img.reshape((-1,3))
Z = np.float32(Z)
# define criteria, number of clusters(K)
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 10, 1.0)
K = 2
ret,label,center=cv2.kmeans(Z,K,None,criteria,10,cv2.KMEANS_RANDOM_CENTERS)
# Create a mask by selecting a hue range around the lowest hue of the 2 colors
if center[0,0] < center[1,0]:
hueofinterest = center[0,0]
else:
hueofinterest = center[1,0]
hsvdelta = 8
lowv = np.array([hueofinterest - hsvdelta, 0, 0])
higv = np.array([hueofinterest + hsvdelta, 255, 255])
mask = cv2.inRange(hsv_img, lowv, higv)
# Extract contours from the mask
ret,thresh = cv2.threshold(mask,250,255,cv2.THRESH_BINARY_INV)
im2,contours,hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
# Find the biggest area contour
cnt = contours[0]
max_area = cv2.contourArea(cnt)
for cont in contours:
if cv2.contourArea(cont) > max_area:
cnt = cont
max_area = cv2.contourArea(cont)
# Make array of all edge points of the largets contour, named allpnts
perimeter = cv2.arcLength(cnt,True)
epsilon = 0.01*cv2.arcLength(cnt,True) # 0.0125*cv2.arcLength(cnt,True) seems to work better
allpnts = cv2.approxPolyDP(cnt,epsilon,True)
end_time = time.time()
print("Elapsed cv2 time was %g seconds" % (end_time - start_time))
# Convert back into uint8, and make 2 color image for saving and showing
center = np.uint8(center)
res = center[label.flatten()]
res2 = res.reshape((hsv_img.shape))
# Save, show and print stuff
cv2.drawContours(pntscanvas, allpnts, -1, (0, 0, 255), 2)
cv2.imwrite("pntscanvas.bmp", pntscanvas)
cv2.imshow("pntscanvas.bmp", pntscanvas)
print('allpnts')
print(allpnts)
print("center")
print(center)
print('lowv',lowv)
print('higv',higv)
cv2.imwrite('mask.bmp',mask)
cv2.imshow('mask.bmp',mask)
cv2.imwrite('CvKmeans2Color.bmp',res2)
cv2.imshow('CvKmeans2Color.bmp',res2)
print ("Waiting for 'Spacebar' to Do/Redo OR 'Esc' to Exit")
while(1):
ch = cv2.waitKey(50)
if ch == 27:
break
if ch == ord(' '):
doredo()
cv2.destroyAllWindows()