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Comment by ayane_m | Hacker News Reader

I'm not going to knock Tesla for trying a primarily visual-only approach, but I will knock them for insisting that it will work out to level 4 autonomous driving with just software.

I predict that these kinds of unexpected edge cases will keep popping up for several years. It certainly will be interesting to see how robust their image processing algorithms get as time goes on, but I wouldn't hold my breath for reliable full self driving for a while.

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I would hold it against them. I think we should start with as many sensors as is necessary to get it working robustly. Over time we can then strip one or the other sensor as we see what we can do with software improvements.

First get something working, then reduce costs, not the other way around.

With hardware, comes software. Having fewer targets for your software can simplify the software and lead to superior results. Edge cases will always be there. You might be introducing some in a particular area with their vision-only approach, but reducing them substantially elsewhere. With radar, they had phantom breaking events and according to them, it's the primary reason they want to ditch it.

I'm on the fence as to whether it's a good or bad decision ... but let's not pretend they're idiots.

Wouldn't two cameras and parallax show that the moon is a bit too far away to worry about?

It would if the cameras were good enough and plentiful enough and can be rectified. It seems pretty clear from all of the failure stories that Tesla either does not do stereopsis up front to establish geometry at all or doesn't do it enough and instead relies primarily on blackbox identification NNs.

You can do structure from motion on a single camera without the need for stereo.

Parallax beyond the distance equivalent to that between the cameras very quickly drops the distance accuracy possible to resolve into the noise floor.

E.g. just a quarter mile is already in the noise.

> just a quarter mile is already in the noise

There's no reason to care about precisely measuring things a quarter of a mile away. Human drivers don't.

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