function not defined. how to call a function that is defined inside a class?

Question

class Image_Filter:
    def __init__(self, image, filter):
        self._imageRows = image.shape[0]
        self._imageColums = image.shape[1]
        self._filterRows = filter.shape[0]
        self._filterColums = filter.shape[1]

    def __filtering__(self, _imageRows, _imageColums, _filterRows, _filterColums, image, filter):
        filtered_image = np.zeros(shape = (rows-2, colums-2))
        for m in range(_imageRows):
            for n in range(_imageColums):
                for k in range(_filterRows):
                    for l in range(_filterColums):
                        filtered_image[m][n] = np.sum(filter[k][l]*image[m+k][n+l])

        return filtered_image`

`This is an implementation of mean filters for images.

I am trying to call the function filtering and it throws an error.

`---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/home/adarsh/Downloads/Semester 2/Computer vision/Snippets/filters.ipynb Cell 4 in <cell line: 1>()
----> 1 filtered_image = __filtering__(image, filter)

NameError: name '__filtering__' is not defined`

Asked By: pyComali

||

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Answer 1

The simple answer would be:

image_filter = Image_Filter(some_image, some_filter)
image_filter.__filtering__(...)

The long answer:
There are a few problems with the code that you provided.

The function filtering has parameters _imageRows, _imageColums, _filterRows, and _filterColums, but these variables are not defined in the scope of the function. You can fix this by using the instance variables self._imageRows, self._imageColums, self._filterRows, and self._filterColums instead.

The filtered_image array is being initialized with shape (rows-2, colums-2), but rows and colums are not defined in the scope of the function. You can fix this by using _imageRows-2 and _imageColums-2 instead.

The filtered_image array is being updated inside the loop using filtered_image[m][n], but this will overwrite the value of filtered_image[m][n] on each iteration. To fix this, you should update filtered_image[m][n] using += instead of =.

Also, there is no need to wrap your function names with __,
this is reserved for python’s magic methods.

Answered By: mighty_mike

function not defined. how to call a function that is defined inside a class?

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