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MarcoForte / closed-form-matting

Python implementation of A. Levin D. Lischinski and Y. Weiss. A Closed Form Solution to Natural Image Matting. IEEE Conf. on Computer Vision and Pattern Recognition (CVPR), June 2006, New York
MIT License
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some confuse about covariance formular #11

Closed chaomaer closed 5 years ago

chaomaer commented 6 years ago

I have read your code. I am confused with this line, why not compute the covariance using built-in function np.cov directly. Can you explain why the covariance is written this way ? thanks.

MarcoForte commented 6 years ago

From what I read on https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.cov.html, np.cov only works for 1D or 2D arrays.