How can I remove the border line from the image ?

I have an image with some character. After the canny edge detection i get the digits with some border line. so I want to remove all the border line and only extract the digits. How can i do that ?

Here is the output of canny Image:

Answer 1

[Image Analyst]

Label the image with bwlabel. Then use regionprops to get the Euler number of each blob. "Hollow" blobs will have an Euler number of 0 or less, while "stick-like" blobs will have an Euler number of 1. Use propfilt() to extract only those with an Euler number of 1.

[sufian ahmed]

@image analyst i want to remove the border line. when i extract the stick-like blobs for example : "1" then border lines also have the same Euler number i think. so how can i distinguish ?