How to reduce noise from image (jpg or Png) in Asp.net C#

Hello

I am capturing an image using Web cam. i have to read text from captured image using OCR. But the issue is.

In some images there is noise or Grains and image quality is not so good. i have also tried a 1080p HD Web cam but it is not satisfactory.

Please tell me how can i reduce noise from image in c#.(asp.net c#)

Thanks