python - 使用 cv2 库在 python 中遍历轮廓的问题

Question

我正在设计一种算法，我必须遍历图像中的每个轮廓并对其应用条件。我正在使用 cv2 库来执行此操作。代码如下：

i=0
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(gray,1,255,0)
contours,hierarchy=cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
while contours:
if (cv2.contourArea(contours[i]) < 5000 and cv2.arcLength(contours[i],True) < 200 ):
    cv2.drawContours(img,contours,i,(0,255,0),3)
i = i+1
contours = contours.h_next()

错误是：

Traceback (most recent call last):
File "C:\Users\NOOR BRAR\Documents\College Stuff\5th SEM\e-yantra\task1\PS1_Task1\Task1_Practice\test_images\countourImagemine.py", line 55, in <module>
contours = contours.h_next()
AttributeError: 'list' object has no attribute 'h_next'

Answer 1

我从未使用过 h_next 但每当我迭代轮廓时

for cnt in contours:
    if (cv2.contourArea(cnt) < 5000 and cv2.arcLength(cnt, True) < 200 ):
        cv2.drawContours(img, [cnt], -1, (0,255,0), 3)

已经奏效了。

看来您正在将迭代器 n_next 与 [i] 混合...尝试以下操作

while contours:
    if (cv2.contourArea(contours) < 5000 and cv2.arcLength(contours, True) < 200 ):
        cv2.drawContours(img, [contours], -1, (0,255,0), 3)
    i = i+1
    contours = contours.h_next()