I made my own image sensor and digital camera [video]
1–10 of 21 posts
Re: I made my own image sensor and digital camera [video]
#2Well done. The quality of explanation and production value were good. It seems like by adding more processing power, you can double or triple the scan rate.
Re: I made my own image sensor and digital camera [video]
#3Using decapped DRAM chip as photo sensor looks more promising:
https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
Re: I made my own image sensor and digital camera [video]
#4Using decapped DRAM chip as photo sensor looks more promising: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
I 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.
Re: I made my own image sensor and digital camera [video]
#5Using decapped DRAM chip as photo sensor looks more promising: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
Very interesting.
Any idea why this happens?
> Exposing the capacitor to light causes it to discharge faster.
Re: I made my own image sensor and digital camera [video]
#6Using decapped DRAM chip as photo sensor looks more promising: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
I 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.
Decapping 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.
Re: I made my own image sensor and digital camera [video]
#7Well done. The quality of explanation and production value were good. It seems like by adding more processing power, you can double or triple the scan rate.
From what I understand scan rate depends on exposure time which is quite a bit high for such a sensor.
Re: I made my own image sensor and digital camera [video]
#8Using decapped DRAM chip as photo sensor looks more promising: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-...
Very interesting. Any idea why this happens? > Exposing the capacitor to light causes it to discharge faster.
My 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.
Re: I made my own image sensor and digital camera [video]
#9Earlier quoted context omitted.
I 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.
Decapping 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 o…
> 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.
Re: I made my own image sensor and digital camera [video]
#10Instead of a front lens element you might get better results using a lens salvaged from an old medium format folder. The whole lens and shutter assembly comes off as a single standard sized unit.
These should be a good fit for the needed image circle and give better images as well.