How does a barcode scanner work?
25:25
EEVblog #637 - Omni Directional Laser Barcode Scanner Teardown
12:04
How does a Mouse know when you move it? || How Does a Computer Mouse Work?
14:44
The Math behind QR code, what happens inside there?
20:31
Supermarket Barcode Scanner Teardown and hack!
16:10
What Are Those Other Weird QR Codes?
6:22
How QR Codes Work.
14:47
Laser Scanning Microscope from Blu-ray Player #3: Increasing the Resolution
3:37