phk23

Thanks a bunch. Great notes!!!

Hi everyone, Is there any way to detect if CCTV surveillance footage of an empty room has been tampered with? I am writing a scene for my spec screenplay where a federal agent figures out the CCTV footage of a secure room has been altered. In my story, a security guard is in on the heist and alters the footage so it looks like no one has entered the room. Other than digital watermarking, are there other ways to prove/detect footage tampering? Any advice would be greatly appreciated. Thanks, Peter

I thought of a potential solution, but it needs validation. Is the following possible/plausible? Is there a way that CCTV footage of a still room has been duplicated just by looking at it? CCTV cameras record light information onto a pixel grid, but even if we’re looking at a still room, the light variations in pixels change, right? Would that light variation create a unique pattern from frame-to-frame? Ex: Minute 3:56 of Footage A and minute 3:56 of Footage B will look like the same image to the naked eye, but zoomed in, you can see the exact same light variation of pixels. An exact match would only be possible if the footage were duplicated. Is that feasible? Thanks. I appreciate the feedback!

Okay, thanks. Assuming they could edit/alter the date and time stamp at the bottom of the footage, I'm guessing the best way is to checked who accessed the footage. What if they obtained the administrator's password and accessed it? Does that mean one can go into the system and check what time the logged footage was accessed?