pdvelez/cv-lecture-quizzes-python

Python version of GT/Udacity Introduction to Computer Vision quizzes

cv-lecture-quizzes-python's Issues

3B-L3 block size mismatch w/ answer

Really minor, but caught me off guard:
in 3B-L3/match_two_strips.py, b = 100,
while in 3B-L3/answers/match_two_strips.py, b = 80

Request: 2A-L6, Edge Demo

The edge demo covers the use of canny on Lena and Laplacian of Gaussian

Request: 2B-L1 Hough Demo

While I understand that we suppose to build the Hough model by ourselves for one of the PS, it will be good to have a baseline for comparison. Also, since past students using Matlab/Octave have this resource, it makes sense for this python generation to have access to the same baseline materials.

Request: 2A-L3 Can we contribute missing method?

@pdvelez Would you want someone to contribute the missing gaussian noise method here? https://github.com/pdvelez/CV-lecture-quizzes-python/blob/master/2A-L3/apply_median_filter.py#L21

2A-L5 Runtime error with OpenCV 4.0.x

I'm getting this error when trying to run the solution for gradient_quiz.py:

Traceback (most recent call last):
File "CV-lecture-quizzes-python/2A-L5/answers/gradient_quiz.py", line 22, in
cv2.imshow('Image', img) # assumes [0, 1] range for double images
cv2.error: OpenCV(4.0.0) c:\projects\opencv-python\opencv\modules\imgproc\src\color.hpp:261: error: (-2:Unspecified error) in function '__cdecl cv::CvtHelper<struct cv::Set<1,-1,-1>,struct cv::Set<3,4,-1>,struct cv::Set<0,2,5>,2>::CvtHelper(const class cv::_InputArray &,const class cv::_OutputArray &,int)'
> Unsupported depth of input image:
> 'VDepth::contains(depth)'
> where
> 'depth' is 6 (CV_64F)

2A-L1

Could you please add one for Load and Display Image?

2A-L5 Answer out of sync with Student copy

The student version calculates gmag thusly:

gmag = np.sqrt(gx2 + gy2) / (4 * np.sqrt(2))

While the answer uses:

gmag = np.sqrt(gx2 + gy2)

This is causing the gradient to be all zeros