i'm trying to find the length and width in pixels of the rectangle outlined by the thin black line in the attached .jpg/image. the L and W of the image/jpg is slightly bigger than the black line rectangle. 
any guidance and/or direction would be appreciated. let me know
Here is code:
#!/usr/bin/python 37
#OpenCV 4.3.0, Raspberry Pi 3/B/4B-w/4/8GB RAM, Buster,v10.
#Date: 3rd, June, 2020
import cv2
font = cv2.FONT_HERSHEY_SIMPLEX
frame = cv2.imread('text.jpg')
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
blur = cv2.GaussianBlur(gray, (7, 7), 0.5)
edge = cv2.Canny(blur, 0, 50, 3)
contours, hierarchy = cv2.findContours(edge, cv2.RETR_EXTERNAL,
cv2.CHAIN_APPROX_SIMPLE)
for contour, hier in zip(contours, hierarchy):
(x,y,w,h) = cv2.boundingRect(contour)
cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
cv2.putText(frame, ('width = {}, height = {}'.format(w, h)),
(x+30, y+30),
font,
1,
(0, 255, 0),
2,
cv2.LINE_AA)
cv2.imshow('Measure Size', frame)
cv2.waitKey(0)
Outtput:
Asked: 2020-06-01 09:56:56 -0600
Seen: 12,668 times
Last updated: Jun 03 '20
The width and height of the rectangle correspond to the width and height of the bounding rect of the contour. Here's what I would do: - Contour detection of the outer contour - Evaluation of the Bounding Rect