I would like to convert this image to gray scale in OpenCV and then find the settings to threshold it. I want to threshold the black spaces inside of the skull. Can someone write out a Python script using OpenCV?
I convert to grayscale with: gray = cv2.cvtColor(pic, cv2.COLOR_BGR2GRAY)
When I do (ret, thresh) = cv2.threshold(gray, 177, 255, cv2.THRESH_BINARY) I get a black image.
When I do (ret, thresh) = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY) the whole head becomes a white blob.
CodePudding user response：
I usually apply OTSU with good results.
ret,gray = cv2.threshold(gray,100,255,cv2.THRESH_BINARY cv2.THRESH_OTSU)
CodePudding user response：
If i has understood your goal correctly, here is my proposal. It uses Otsu's Thresholding as @stateMachine has said.
import cv2
im = cv2.imread("IScDg.png")
gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
# Your first method
(_, thresh1) = cv2.threshold(gray, 177, 255, cv2.THRESH_BINARY)
# Your second method
(ret, thresh2) = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY)
# Proposed method
(_, thresh3) = cv2.threshold(gray, 0, 1, cv2.THRESH_BINARY | cv2.THRESH_OTSU)
