Coded-light bench · ideal 16×16 instrument

Single Pixel Camera

The sensor never sees an image. A mask illuminates selected parts of the object; one bucket detector returns one total brightness. Repeat with orthogonal patterns and the image can be assembled from those scalars.

Place an object

Use a local image

FileReader stays in this browser. Images are centre-cropped, composited on white, and reduced to 16×16 grayscale; nothing is uploaded. Maximum 8 MB.

Object

16×16 source

Coded light

binary Walsh mask

One pixel

Return

partial inverse transform

Choose the mask reel

Structure first Detail first Sylvester order

One scalar, honestly defined

brightnessₖ = Σ binaryMaskₖ[i] × source[i]

The first all-on exposure supplies total brightness. Every signed Hadamard coefficient is then 2 × brightnessₖ − allOnBrightness.

Mask reel0 / 256 masks measured

The return changes because each new scalar adds one orthogonal basis image—not because a hidden photograph is slowly unblurred.

Keep the result