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Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
You can recover some MTF resolution by applying a sharpening filter, at the cost of increased noise. The idea is to measure the transfer function (using a sharp shadow edge), calculate the inverse of that, and apply it in an FIR filter. This works, we have done it here, but as i said at the cost of increased noise.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
well, testing show that it is better when my old detector, even at 4x speed.
Now i have to develop fpga core that could do single point DFT in real time, since my dsp can do 1.2MHz PID loop, but only if it has data inside memory, and simple flag toggle only works to 30MHz at 400MHz core speed
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Finlay get it working. I can calculate phase at 207k spectrum acquisition speed, that translates around 500Mbps real time data processing speed from my Sharc DSP, cool huh ?
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
Linas wrote ...
Finlay get it working. I can calculate phase at 207k spectrum acquisition speed, that translates around 500Mbps real time data processing speed from my Sharc DSP, cool huh ?
I have to say that is a beautiful board (I'm a bit of a PCB connoisseur!). Congratulations!
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Conundrum wrote ...
I have a Gen 0 IR tube here and some assorted linear CCDs if they would help.
CCD is pain to interface, also need special amp to get intensity with high dynamic range. go for CMOS type, only two signals, and rail to rail output from integrator, no amp needed for low speed, like TSL1401CL
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