OpenCV Python Tutorial For Beginners 21 - Image Pyramids with Python and OpenCV

In this video on OpenCV Python Tutorial For Beginners, I am going to show How to use Image Pyramids with Python and OpenCV.
There are two kinds of Image Pyramids. 1) Gaussian Pyramid and 2) Laplacian Pyramids

OpenCV is an image processing library created by Intel and later supported by Willow Garage and now maintained by Itseez. opencv is available on Mac, Windows, Linux. Works in C, C++, and Python.
it is Open Source and free. opencv is easy to use and install.

Starting with an overview of what the course will be covering, we move on to discussing morphological operations and practically learn how they work on images. We will then learn contrast enhancement using equalization and contrast limiting. Finally we will learn 3 methods to subtract the background from the video and implement them using OpenCV.

At the end of this course, you will have a firm grasp of Computer Vision techniques using OpenCV libraries. This course will be your gateway to the world of data science.

Feel the real power of Python and programming! The course offers you a unique approach of learning how to code by solving real world problems.

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[greybandreg]

finally found the good explanation for image pyramid. good job

[elarbiamraoui]

last image is in index 6, not 5.. small inattention mistake because the array had an element before the for loop, aside from that, good work !

[jayshimpi]

you can fix the error by rectifying
gaussian_extended = cv2.pyrUp(gp[i], dstsize = (gp[i - 1].shape[1], gp[i - 1].shape[0]))
these parameter basically needs the size of the image,
I guess the updated version of python gives that error.

[hermeticGreen]

for I in range(6) does NOT iterate 5 times....

[zoltantorok]

Hi, I've been following this playlist, and this is the first tutorial I had a problem with.

On the line "laplacian = cv2.subtract(gp[i-1], gaussian_extended)
" I get an error that reads:

Traceback (most recent call last):
File "[File Path]", line 20, in <module>
[code mentioned earlier]


cv2.error: OpenCV(4.1.1) error: (-209:Sizes of input arguments do not match) The operation is neither 'array op array' (where arrays have the same size and the same number of channels), nor 'array op scalar', nor 'scalar op array' in function 'cv::arithm_op'

What should I do to fix it? It's some sort of problem with cv2.subtract, because I get good results both for gp[i-1] and gaussian_extended. With the code from your website, I get the same error.

Thank you very much to anyone who knows what to do.

[randalllionelkharkrang]

Why did you use a copy of the image instead of the variable containing the image ?

[debjanichakraborty]

cv2_imshow(str(i), layer) this line is not working in google colab.
can anyone suggest how do I write this?

[Nanda-hoeh]

I'm getting this error. I'have copied the same code. Can anyone please help me out?? ---AttributeError: 'NoneType' object has no attribute 'copy'

[اسامةرائد-وذ]

Please i need the project in c# language 😭😭 who can get the code for c#