我有一個機器人移動的影像，我需要提取白環
為了找到機器人的中點。但是閾值沒有給出正確的結果：
我應該嘗試什么方法只提取白環。
%code to get second image
img=imread('data\Image13.jpg');
hsv=rgb2hsv(img);
bin=hsv(:,:,3)>0.8;
uj5u.com熱心網友回復：
類似的東西？
import cv2
import numpy as np
# get bounding rectangles of contours
img = cv2.imread('img.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(gray, 200, 255, cv2.THRESH_BINARY)
contours, _ = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
# filter contours by area and width
contours = [c for c in contours if (50 < cv2.contourArea(c) < 500) and cv2.boundingRect(c)[2] > 20]
# draw contours on empty mask
out = np.zeros(thresh.shape, dtype=np.uint8)
cv2.drawContours(out, contours, -1, 255, -1)
cv2.imwrite('out.png', out)
輸出：
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