Simple shape detection – Opencv with Python 3

We’ll se in this video how to perform a simple shape detection.
Starting from an image with a few shapes, we’ll be able to detect exactly each shape (rectangle, circle, pentagon, etc.) and the position.

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[hkshetty]

Thanks!! Your video really helped me in kicking off my assignment. :)

[nodrug]

Really like your videos, you explain clearly and know what you are doing and it is so easy to learn from them. I feel if you rehearsed maybe once or twice before recording that you would come up with a smoother more professional product and bring up your videos a level.

[rodolfocruz]

I really like your channel, I learn a lot for my projects :) Keep going

[dishikapoddar]

how do we avoid the entire image being recognized as a rectangle?

[anuragsuryawanshi]

I want the name of the detected shapes to be written in output section....how to do that??

[KKMaity]

hello.. love your videos. could you please show us/me how to find center coordinates of these objects in pyhton?

[chema]

Hi im trying to do an aplication similar to yours but I have a question, what happens if u have the shapes conected, does OpenCv detect it correctly?

[anthonyhuang]

Is it possible to track a moving object and measure its angle using Opencv with python? For example, if I would like to measure the angle of my knee bending when I am running. How could I do? Thank you very much!

[informeta]

@pysource, can you explain how to create layout of different shapes of RGB images in Python.

[carbonatepump]

Awesome tutorials! May I ask if you have one on detecting numbers? Aka using a template number (eg 4) and checking on a larger image for all appearances of 4, regardless of orientation, scale etc?

[angeloespinoza]

Could you do a video or explain me how can you do this but in real time? I'd appreciate it so much

[bharathur]

how to eliminate the contour drawn for the window.?

[sheharyarkhan]

What version of python and opencv u are using and on which operating sys?

[delgermaasergelentugs]

the name of the program you are writing

[ojhamanvi]

@7:06
error: OpenCV(4.2.0) error: (-215:Assertion failed) npoints > 0 in function 'drawContours'

[sanatmohrir]

Thanks for the code. And what if we want to find numbers of the objects detected ie finally it should show:
Triangle = 3
Ellipse = 2
circle(s) = 1
etc..
Your help will be very much appreciated XD

[LunarPSD]

approx is giving me the wrong # of sides: 4, 10, 16, 5. code is: for cnt in contours:
approx = cv2.approxPolyDP(cnt, 0.01*cv2.arcLength(cnt, True), True)
cv2.drawContours(img, [approx], 0, (0), 5)
print(len(approx))

[Yourself]

help me .code error _, contours, _ = cv2.findContours(threshold, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)

[wllsk]

in line 5 is that
_, threshold - cv2
or
_, threshold = cv2
, sorry :D

[onandonandomnom]

I see an oval on a red object and I see it