Instead of risky downloads, here is an authentic review of the actual textbook by S. Sridhar to help you decide if it's worth acquiring legally. Digital Image Processing by S. Sridhar This textbook, published by Oxford University Press
PDF Availability
If you legally obtained a PDF that is password‑locked (e.g., from your library’s loan system) and want to remove the password for personal accessibility (e.g., screen reading software), tools like QPDF (open source) can remove owner passwords if you have printing permission. This is legally gray depending on jurisdiction, but technically possible. digital image processing s sridhar pdf free better patched