In OMR, if scanned OMR is not in correct position then how can i deskew the image and search exact location of roll number rectangle?i want to extract information from different rectangle based on bubble selection. i need help to sort out this problem.
You can implement following pipeline:
1) Threshold scan image with Otsu's method (will works better if background will be darker than the blank);
2) Make morphological filtration to reduce the thresholding noise;
3) Find good features by means of goodfeaturestotrack;
4) Find minimal area rectangle for the good features;
5) Perform image rotation and cropping
@Rashmi he has explained an approach (for which thank you pi-null-mezon) and now expects you to give it a try. This is not a forum where we simply give you the solution, but rather guide you to a decent solution to the problem...
@Ramshi I have worked on the similar problem some time ago and created dedicated git project, you can simply research the source code
@pi-null-mezon thank you for the solution.i will try and let you know how it working
@Rashmi by the way, those black rectangles on the blank seems to be good targets for the thresholding, so as a first step you can threshold them instead of whole blank
Asked: 2016-12-22 00:27:21 -0600
Seen: 2,098 times
Last updated: Dec 23 '16
