Hacker News Reader

> "In NLOS (and traditional photography) the scene to be imaged is illuminated with N photons but the detector only receives M photons worth of signal back, where M<<N."

How about "averaging" several attempts to compose a single shot? Would it be possible to shine lasers of multiple wavelengths to achieve better results? maybe varying angles as-well?

View on HN

Averaging N images should (roughly?) make the noise go down by sqrt(N), so long as you don't introduce more sources of noise during collection. So the camera would have to be still, or the images registered to a common perspective.

The camera or subject can move, and as long as the movements are known then the reconstruction is still perfect.

High end mobile phone cameras take hundreds of shots over a second or more to reduce noise, and rely on the fact they can estimate movement of things in the frame with optical flow and a gyroscope.

This is what I meant by "registration", for the case when the subject isn't changing.

Reply on news.ycombinator.com