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Using decapped DRAM chip as photo sensor looks more promising: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-chip/ https://hackaday.com/2014/04/0
by ruslan 7y ago
Using decapped DRAM chip as photo sensor looks more promising:
https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-chip/ https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
- jdsully 7y agoI wonder how good images could be with modern DRAM. A 256MB DDR3 chip would theoretically have over 2 trillion pixels. Light sensitivity should be better too due to the smaller capacitors.
- ruslan 7y agoDecapping and testing this wont be difficult, meaning you understand how individual transistors are located on the die to reorder raw data into planar image. I wonder if this information can be recovered using some known patterns shown to such sensor then retrieving appropriate data and analyzing. Another interesting thing is that for training neural networks for image recognition purpose information about location of individual pixels is not necessary at all.
- im3w1l 7y ago> Another interesting thing is that for training neural networks for image recognition purpose information about location of individual pixels is not necessary at all. Convolutions use the spatial information. I'm less sure whether attention-based approaches typically use it.
- jacquesm 7y agoJust move it about for a bit with frames sampled in sequence and you should be able to build up a pretty good map of the arrays of cells.
- zapdrive 7y agoWho is down voting this comment?
- jdsully 7y agoProbably because I was off by a factor of 1,000. Still a billion pixels is pretty good.
- saganus 7y agoVery interesting. Any idea why this happens? > Exposing the capacitor to light causes it to discharge faster.
- ruslan 7y agoMy guess is this: Capacitors on DRAMs are usually implemented as PN junctions, maybe even parasitic capacitance of a transistor is used. Photons hitting depletion region of PN junction decreasing it hence increasing conductivity.
- jacquesm 7y agoThat's how CMOS cameras got started in the first place.