opencv - 如何找到形状边界的直线近似值？

Question

这是图片:

我需要找到此图像边界的直线近似值。

Answer 1

1. 阈值
2. 找到轮廓
3. approxPolyDP

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#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)

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