Warp Perspective / Bird View [6] | OpenCV Python Tutorials for Beginners 2020

In this video, we will learn how to use warp perspective in openCV to get a bird view of a Region of interest.

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[yuangchengyuancheng]

Very impressive. Sir could you please make a video to show us a way to quantify the rotation of images, one is reference and the other one is deformed. Thank you in advance.

[SuperViktube]

This stuff is great Murtaza. Is there a good book on opnecv

[LeonardoJPaes]

Awesome tutorial like the If I may add an info, in my case my opencv had a version problem, and I downgraded to an older version and it worked fine

[ozlemozbakr]

With similar method, a body photograph taken from the front profile can be made to appear in perspective.
Kendi dilimle: ilham verdiğin için teşekkürler😊.

[Mitolost]

Hi, I'm watching your videos and I have to measure the size of a foot on a sheet. I am following your tutorial on this subject, but in it all I can do is calculate if the object above is a square. Need to help me or indicate where to edit the code? Thanks in advance.

[aiforyounow]

Sir please is it possible to do the same thing using the webcam instead???

[awwabsiddiqui]

It does not take float32 points
And if we change it to np.array, then matrix element (getperspectivetransform)is not formed

[lookintoureyes]

On line 9, it should be (0, height) not the (height, 0), appreciate if you could include Image with Projects. Nice Concept and Thanks for your efforts

[adityanjsg]

Recording this video @12 44 AM in the morning . Dedication level ultra pro max.

[abu]

Thank you for sharing the code. and how to find the object`s center point and the farthest distance from the center point, for example, the center of the egg and the top section can you make video

[anonymoussloth]

do you know any resources/videos that code this by scratch? I am trying to implement this on my own and I don't know where to start

[smDonttakemeseriously]

Can you make a video how to allign multiple images taken at a burst and then use the aligned image to increase resolution

[williamscaramuzzi]

today, in february 1st, 2023, I ran into some errors... np.float32 seems to be deprecated... cv2.circle only accepts integers for the center parameter... but cv2.getPerspectiveTransform requires so I created the pts1 and pts2 matrices with np.array([coordinates], dtype=np.float32), and parsed to int inside np.circle call

[bilalzafar]

Can you make video to calculating the Coordinates that Hard Code the points so instead of Hard Code how we can find Coordinates.
Thanks in Advance.

[bulletforcekurdish]

Hello, I am getting this error: Traceback (most recent call last):
File "C:/Users/DOS/PycharmProjects/pythonProject/WarpPerspective.py", line 11, in <module>
cv2.circle(img, (pts1[x][0], pts1[x][1]), 5, (255, 0, 0), cv2.FILLED)
cv2.error: OpenCV(4.6.0) :-1: error: (-5:Bad argument) in function 'circle'
> Overload resolution failed:
> - Can't parse 'center'. Sequence item with index 0 has a wrong type
> - Can't parse 'center'. Sequence item with index 0 has a wrong type

[Ak-kcqp]

If line no 9 in not working try using np.int16 instead of np.float32...so simple remove np.float32 it will work

[jakubskladany]

Traceback (most recent call last):
File "C:\Users\sklad\PycharmProjects\OpenCV\warpPrespective.py", line 9, in <module>
cv2.circle(img, (pts1[0][0], pts1[0][1]), 5, (0, 0, 255), cv2.FILLED)
cv2.error: OpenCV(4.5.5) :-1: error: (-5:Bad argument) in function 'circle'
> Overload resolution failed:
> - Can't parse 'center'. Sequence item with index 0 has a wrong type
> - Can't parse 'center'. Sequence item with index 0 has a wrong type

WHAT I MUST DO FOR THE RUN? PLEAS HELP MEE

[mohammedsadiq]

Warp perspective and the get perspective transform are not showing

[KoradiyaAbhay]

How can we apply perspective transformation using angle?

[xXMacedoniaNXx]

The error:
Incorrect: pts2 = np.float32([[0, 0], [width, 0], [height, 0], [width, height]])
Correct: pts2 = np.float32([[0, 0], [width, 0], [0, height], [width, height]])
The change: Swap [height, 0] to [0, height]