Screen → camera · no network · no pairing
The payload travels as light.
NLRC Decimen turns one screen into a transmitter and any camera into a receiver. Pick a file on the sender — it dissolves into a stream of fountain-coded frames, and the phone pointed at it reassembles the original, byte for byte. No network path between the devices exists.
Live proof: the frame on the right is a real stream, right now. Open Receive on a phone, point it at the circle, and you will actually catch a file out of the air.
LIVE · DEMO PAYLOAD
Version—
Blocks—
Frame—
Rate—
129 KB/sphone-to-phone, handheld
~15%frame overhead — erasure-proof
0permissions beyond the camera
MITopen source, in your browser
PROTOCOL
How the beam works
a real sequence — follow it in orderPick a file on the sender
Any file, any size. It is split into blocks and the sender starts broadcasting an endless stream of animated codes — each one a different XOR combination of those blocks.
Point a camera at it
The receiver decodes whatever frames it can catch — blur, dropped frames and refresh-straddling cost a little time, never correctness. There is no back-channel and no retransmission.
The file reassembles
A Luby-transform decoder peels the payload out of any ~15% overshoot of distinct frames, verifies it against a hash embedded in every frame, and offers it back as a file. Light in, file out.
Ready to beam something?
One screen transmits. One camera receives. That is the whole setup.