如何找到形状边界的直线近似值？

Question

＆lt; p＆gt;这是图片：＆lt; / p＆gt; ＆lt; p＆gt;＆lt; a href =“https://i.stack.imgur.com/a59fc.png"rel =”nofollow noreferrer“＆gt;＆lt; img src =”https：//i.stack.imgur。 com / a59fc.png“alt =”在此处输入图像说明“＆gt;＆lt; / a＆gt;＆lt; / p＆gt; ＆lt; p＆gt;我需要找到该图像边界的直线近似值。＆lt; / p＆gt;

Answer 1

1. 阈值
2. findContours
3. approxPolyDP

#findContours
contours = cv2.findContours(thresh,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)[-2]

canvas = img.copy()

## draw approx contours

for cnt in contours:
    arclen = cv2.arcLength(cnt, True)
    approx = cv2.approxPolyDP(cnt, arclen*0.005, True)
    #drawContours
    cv2.drawContours(canvas, [approx], -1, (0,0,255), 1, cv2.LINE_AA)

cv2.imwrite("result.png", canvas)