Порогова обробка

 
#type=cv2.THRESH_BINARY
#type=cv2.THRESH_BINARY_INV
#type=cv2.THRESH_TRUNC
#type=cv2.THRESH_TOZERO
#type=cv2.THRESH_TOZERO_INV
#type=cv2.THRESH_OTSU
#type=cv2.THRESH_TRIANGLE
#type=cv2.THRESH_BINARY+cv2.THRESH_OTSU
#type=cv2.THRESH_BINARY+cv2.THRESH_TRIANGLE
type=cv2.THRESH_BINARY
thresh=127
maxvalue=255
ret, thresh = cv2.threshold(img, thresh, maxvalue, type)
#ret=thresh

Адаптивна порогова обробка

 
img=cv2.imread('air.jpg',0)
maxValue=255
#method=cv2.ADAPTIVE_THRESH_MEAN_C 
method=cv2.ADAPTIVE_THRESH_GAUSSIAN_C
#thresholdType=cv2.THRESH_BINARY
thresholdType=cv2.THRESH_BINARY_INV
blockSize=21 # Непарне число
C=0# константа яка віднімається  від середнього значення
img_tr=cv2.adaptiveThreshold(img, maxValue, method , cv2.THRESH_BINARY , blockSize, C)