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I am trying to build a document scanner using openCV. I am trying to auto crop an uploaded image. I have few use cases where there is a gap in the border when the document is out of frame(captured image).

Ex image

C:\fakepath\unnamed.jpg

Below is the canny edge detection of the given image.

C:\fakepath\canned.jpg

The borders are missing here and findContours does not return me proper results due to this. How can I handle such images.

Both automatic canny edge detection as well as dilate does not work in such cases because it can join only small edges.

Also few documents might have only 2 sides or 3 sides captured using camera and how can we crop the other areas which is not required.

Example Image:

C:\fakepath\unamed2.jpg

Is there any specific technique for handling such documents? Please suggest few ideas.

Source Code: gist.github.com/sureshbabuinfo/f398a758dbbec64eee2d7c8221b0c970

I am trying to build a document scanner using openCV. I am trying to auto crop an uploaded image. I have few use cases where there is a gap in the border when the document is out of frame(captured image).

Ex image

C:\fakepath\unnamed.jpg

Below is the canny edge detection of the given image.

C:\fakepath\canned.jpg

The borders are missing here and findContours does not return me proper results due to this. How can I handle such images.

Both automatic canny edge detection as well as dilate does not work in such cases because it can join only small edges.

Also few documents might have only 2 sides or 3 sides captured using camera and how can we crop the other areas which is not required.

Example Image:

C:\fakepath\unamed2.jpg

Is there any specific technique for handling such documents? Please suggest few ideas.

Source Code: gist.github.com/sureshbabuinfo/f398a758dbbec64eee2d7c8221b0c970

I am trying to build a document scanner using openCV. I am trying to auto crop an uploaded image. I have few use cases where there is a gap in the border when the document is out of frame(captured image).

Ex image

Below is the canny edge detection of the given image.

The borders are missing here and findContours does not return me proper results due to this. How can I handle such images.

Both automatic canny edge detection as well as dilate does not work in such cases because it can join only small edges.

Also few documents might have only 2 sides or 3 sides captured using camera and how can we crop the other areas which is not required.

Example Image:

Is there any specific technique for handling such documents? Please suggest few ideas.

Source Code: gist.github.com/sureshbabuinfo/f398a758dbbec64eee2d7c8221b0c970

I am trying to build a document scanner using openCV. I am trying to auto crop an uploaded image. I have few use cases where there is a gap in the border when the document is out of frame(captured image).

Ex image

Below is the canny edge detection of the given image.

The borders are missing here and findContours does not return me proper results due to this. How can I handle such images.

Both automatic canny edge detection as well as dilate does not work in such cases because it can join only small edges.

Also few documents might have only 2 sides or 3 sides captured using camera and how can we crop the other areas which is not required.

Example Image:

Is there any specific technique for handling such documents? Please suggest few ideas.

Source Code: gist.github.com/sureshbabuinfo/f398a758dbbec64eee2d7c8221b0c970