How to recognize text in images with blue background and boxed

[eng.ahmed....@gmail.com]

Hi All,

I have this image and I want to recognize the letters inside it. How I can to that.

I have tried to change the background to white and text to black but failed also.

[Mohit Jain]

You can try a local-otsu preprocessing step on this image and then pass the binary image to Tesseract. If you need something more sophisticated, try colour invariant text-binarization (https://github.com/jasonlfunk/ocr-text-extraction) instead of local-otsu.