Find width and height of RotatedRect

Question

Refer to This C++ code I am trying to change in python to do the exact same thing but I am stuck at for loop to find aspect_ratio. I am not getting any clue to get the minimum and maximum width and height of RotatedRect in python as an alternate to RotatedRect of C++ in Python is cv2.boxPoints

import cv2
from matplotlib import pyplot as plt
img = cv2.imread('C:/Users/Zeeesh/Desktop/1.jpg', cv2.IMREAD_GRAYSCALE)
ret,thresh = cv2.threshold(img,200,255,0)
img1,contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_NONE)
out = cv2.cvtColor(img, cv2.COLOR_GRAY2BGR)
for contour in contours:
    rect = cv2.minAreaRect(contour)
    (x, y), (width, height), angle = rect
    aspect_ratio = min(width, height) / max(width, height)

    thresh1 = 0.2
    if (aspect_ratio > thresh1):
        print('Straight Line')
        for pt in contour:
            cv2.drawContours(out, [pt], 0,255,0)
    else:
        print('Curve')
        for pt in contour:
            cv2.drawContours(out, [pt], 0,0,255)






plt.imshow(out)

score 18 · Accepted Answer · answered Sep 09 '18 at 19:25

18

You can find width and height of the rotated rect with:

rect = cv2.minAreaRect(contour)
(x, y), (width, height), angle = rect

Then the aspect ratio is:

aspect_ratio = min(width, height) / max(width, height)

answered Sep 09 '18 at 19:25

Miki

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Thankyou so much for your help. I am trying to find the curve in this [This Image](https://stackoverflow.com/q/52233166/9134476) but it's giving me an error for this. – Roshni Amber Sep 11 '18 at 03:48
I have edited your code to this as per my problem but it isn't helping me – Roshni Amber Sep 11 '18 at 07:44
above code is edited. Please help me – Roshni Amber Sep 11 '18 at 07:47
Are the width and height in px? – Fra Dec 05 '20 at 16:56
1

@Fra yes, of course – Miki Dec 05 '20 at 23:10

Find width and height of RotatedRect

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