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Author Comment Last activity Moderation
viechdokter "I could re-scale but ... when everybody here gets the same minimum 2.55 increments here and you want reproducible spectral data then everyone shoul..." | Read more » about 8 years ago
stoft "Hmmm, well the RAW data should have the same scale units which would be unsigned 8-bit integer from 000 to 255 -- so the Y axis should show noise h..." | Read more » about 8 years ago
viechdokter "I took the data from the CSV files that Spectral Workbench provides with my spectra. I had a look at one of dhaffners spectrum CSV files and see th..." | Read more » about 8 years ago
stoft "Well, except there's still a problem with the plot. The smallest increment looks to be '4 steps' per scale units of '10'. Either there was some mul..." | Read more » about 8 years ago
viechdokter "Okay, here I combined the 4 channel max/min-difference curves in one diagram so they have the same vertical scale now: And here the combined dat..." | Read more » about 8 years ago
viechdokter "Talking about bits and quantization: I also noticed that certain values (2.55 and multiples thereof like 5.1, 7.65 ...) appear in every spectrum's ..." | Read more » about 8 years ago
stoft "Yes, it's called quantization; the camera only has 8-bits and the scale of the two plots is likely about 3-5x different. Take a look at the 'red' p..." | Read more » about 8 years ago
warren "Hmm, very interesting -- without vertical scale its hard to say though - I believe the "plateaus" on the "average curve" are artifacts of the preci..." | Read more » about 8 years ago
viechdokter "@warren:They would be low-noise green if you average them. ;-) @stoft: BTW, I noticed that curves that were averaged over two or more channels l..." | Read more » about 8 years ago
warren "Would he be low-noise green? :-) I'd also love to see them plotted on the same graph, maybe with the graph lines themselves in appropriate colors...." | Read more » about 8 years ago
viechdokter "Yeah, I think I could do it. Hmh, I must admit that I only pretty recently started to use Excel-like programs at all. To be honest, your research n..." | Read more » about 8 years ago
stoft "I believe both Excel and Quattro Pro provide for multiple plots. I suspect your's may as well -- in Quattro it's under the specialty xy plotting. I..." | Read more » about 8 years ago
viechdokter "Yes, you are right. I, too, like comparable curves better. I used LibreOffice, a kind of public domain "Excel". It plots diagrams automatically and..." | Read more » about 8 years ago
stoft "Not to worry, I too find bits to revise after I publish; what counts is fixing the details as they appear. One thought on visualization. When I do ..." | Read more » about 8 years ago
viechdokter "@stoft : sorry I had to revise the research note as there was a big mistake in the red curve. I exchanged it with the new revised red curve and now..." | Read more » about 8 years ago
stoft "Right. That's the Bayer filter pattern which sits in front of the imager chip and gives double the signal sensitivity for Green -- a simulation of ..." | Read more » about 8 years ago
viechdokter "@stoft : RGGB like in this picture? " | Read more » about 8 years ago
stoft "Good observations! Remember that the AGC is likley based on the sum total over the entire image; not per pixel. If there were independent AGC per c..." | Read more » about 8 years ago
Joeri2 "I read that. I tried anyway just to check if there was anything perhaps a small difference. And so far I noticed a completely different problem. I..." | Read more » over 9 years ago
MrBumper "I'm not at all sure you can measure what you seem to be talking about, or at least not in the way you seem to be going about it. As far I know the ..." | Read more » over 9 years ago
mathew "This sounds like a great idea! Getting the lighting conditions and reflections to a minimum will be crucial to making this work. some flat, diffus..." | Read more » about 10 years ago