How to remove shadow from image ?

I am building a braille dots recognition program. After i acquire image through the camera and convert it into binary, the shadow also becomes significant and hence the result gets affected. Can you suggest me a code to avoid the effect of shadows?? Here is the example image(shadow is on the bottom half part of the image):

Here is the Binary image:

Histogram of the Orignal Image:

[Zaheer Abbas]

No reply yet :/

Answer 1

[Image Analyst]

Try this example: https://www.mathworks.com/help/images/examples/correcting-nonuniform-illumination.html?prodcode=IP&language=en

Other methods that would also work are adapthisteq() and imtophat() or imbothat().

You can also use John D'Errico's polyfitn() to fit the background to a 2-D polymonial. See my attached demo.

[Zaheer Abbas]

Thanks alot. This example worked :)