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Oliver Gelbero
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Asked: 2022-04-21T07:42:21+00:00 In:

How to Draw Bounding Box On Image Python Cv 2 ?

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I would like to draw a bounding box around each closed contour of an area larger than some threshold, not just the biggest contour. How can I go about doing this?. I suggest if you have specific sample that it is relevant  to the “draw bounding box on image python cv2” for the topic of python , it would be great for me.

♦ Suggestions of ITtutoria Team
Ideas for draw bounding box on image python cv2: Use the draw bounding box on image python cv2 to specify where you want your bounding box drawn. This function will display a black rectangle around the outer edge of an image that you can use for cropping, resizing, and other purposes.

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2 Answers

  1. Best Answer

    Keep in mind that your indentation rate is crucial in Python. It’s important to remember that your code does not necessarily draw an area around the largest contour. Instead, it draws an outline around the last part that is drawn by curves. Luckily, the solution is easy. It’s as simple as indenting all calls made in cv2.rectangle() and cv2.putText() to make sure they are evaluated on each loop iteration. You could also remove the call for cv2.boundingRect() by expanding the rect into x, y, w, h. So, DrawingBounding Box On Image Python Cv 2 coule be like this

    ## drawing b.box for given coutour
​
​
contours, _ = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
for c in contours:
    rect = cv2.boundingRect(c)
    if rect[2] < 100 or rect[3] < 100: continue
    print cv2.contourArea(c)
    x,y,w,h = rect
    cv2.rectangle(im,(x,y),(x+w,y+h),(0,255,0),2)
    cv2.putText(im,'Moth Detected',(x+w+10,y+h),0,0.3,(0,255,0))
cv2.imshow("Show",im)
cv2.waitKey()  
cv2.destroyAllWindows()
​
    • 12

  2. An appropriate tip that worked for my side

    # cv2.rectangle(img, pt1, pt2, color, thickness, lineType, shift)
cv2.rectangle(img, (x1, y1), (x2, y2), (255,0,0), 2)
​
"""
x1,y1 ------
|          |
|          |
|          |
--------x2,y2
"""
    • 12

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