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How to remove boundary from binarized image

Following is the result of a binarized image containing licence plate number in the middle and some noise on boundaries. I am developing an algorithm to remove those black areas, so that image becomes something like second example. (Second one is cropped manually before binarization)

So far I tried to remove black lines (horizontal and vertical) base on 1) how many black pixels they have, 2) how black pixel rate drops moving downward starting from top, or upward starting from down.

Nothing works for all images. Any suggestions?

Binarized Image

Manually cropped:

image description

How to remove boundary from binarized image

Following is the result images are results of a binarized binarization algorithm on an image containing licence plate number in the middle and some noise on boundaries. I am developing an algorithm to remove those black areas, so that image becomes something like second example. (Second one is cropped manually before binarization)

So far I tried to remove black lines (horizontal and vertical) base on 1) how many black pixels they have, 2) how black pixel rate drops moving downward starting from top, or upward starting from down.

Nothing works for all images. Any suggestions?

Binarized Image

Manually cropped:

image description

How to remove boundary from binarized image

Following images are results of a binarization algorithm on an image containing licence plate number in the middle and some noise on boundaries. I am developing an algorithm to remove those black areas, so that image becomes something like second example. (Second one is cropped manually before binarization)

So far I tried to remove black lines (horizontal and vertical) base on 1) how many black pixels they have, 2) how black pixel rate drops moving downward starting from top, or upward starting from down.

Nothing works for all images. Any suggestions?

Binarized Image

Manually cropped:

image description