How Blurs & Filters Work – Computerphile

Image filters make most people think of Instagram or Camera Phone apps, but what’s really going on at pixel level? Image Analyst Dr Mike Pound explains some of the most common filters.

Secrets Hidden in Images (Steganography):
JPEG ‘files’ & Colour:
The Dress:
The VR Cave:
JPEG Discrete Cosine Transform (DCT):

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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