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Obviously the high dynamic range is a challenge, but besides that: car reverse camera's cost a few bucks, I don't think this would need to be Way more expensive. It also doesn't have to be stereoscopic and 2048x2048 I'd say... - it would quickly be a step up from the current solution which only allows you to see the welding arc

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A car's reverse camera doesn't have the dynamic range to filter headlights at night, much less an arc that's hot enough to give you a sunburn.

You could just use two cameras, or even four, or eight cameras! Each with a different level of filter. Camera sensors are cheap. Degradation of the sensors on the "bright" cameras would be an issue, however.

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