Image to matrix in python

Question

I'm trying to convert an image into a matrix.

values = []
normal = []
for x in (arr):
    for y in (arr):
        if arr[x,y] > 1:
            normal.append(1)
        else:
            normal.append(0)

And error says:

"ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()"

Thank in advance.

hoang tran · Accepted Answer · 2016-12-01 14:34:19Z

0

It looks like arr is a 2d array. If you want to use x, y as index and arr is a 2d array then try this:

m, n = arr.shape
for x in range(m):
    for y in range(n):
        if arr[x,y] > 1:
            normal.append(1)
        else:
            normal.append(0)

However the code doesn't look pythonic. I would use numpy.where but it is hard to help without knowing what you really want to do.

answered Dec 1, 2016 at 14:34

hoang tran

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3 Comments

Xavier Johanis Over a year ago

thanks for the help, im really new to image processing in python so, can you give me an example where it converts the image into binary matrix?

hoang tran Over a year ago

Take a look at these threads: stackoverflow.com/questions/23225738/… and stackoverflow.com/questions/22351254/… Are you trying to do the same thing?

Xavier Johanis Over a year ago

this is from your second comments, yes although I don't understand the first link

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