Java image library to deskew and crop images

Question

Does anybody have a suggestion for a java library that performs automatic cropping and deskewing of images (like those retrieved from a flatbed scanner)?

Answer 1

ImageMagick can do that; you can use the ImageMagick Java bindings. The auto-crop operator is probably what you're looking for. Automatic deskewing is a much harder problem and involves some significant image processing; I'm not sure if ImageMagick can handle that. If you can figure out the skewing parameters using something else, ImageMagick can definitely unskew it for you.

Answer 2

I'd imagine that someone has built a library on top of the Java Advanced Imaging API for doing this. You could try Googling for "Java Advanced Imaging deskew".

Answer 3

Here is an example on cropping images using Java Advanced Imaging API.

Answer 4

I've written a simple image deskew app, includes source. Available at:

http://www.recognition-software.com/image/deskew/

Answer 5

I wrote a not that simple port of a very good deskewer. It works best if you have some text in the image.

http://anydoby.com/jblog/en/java/1990