p.3 #1 · Panasonic Diffractive Color Filter/Splitter patent
curious80 wrote:
In the modified scheme you will get R' at pixel (0,0) which will correspond in its magnitude with the R from the bayer case. But then at pixel (0,1) you would again have another R' and then at pixel (1,0) another R' and then at (1,1) another R'. That means that in a 2x2 pixel patch the total red signal would be about 4 times the bayer case.
Nope, not quite. At each pixel I have, e.g., a W-B or W+R (or, in my example case, W, W-R, or W-B). Thus I do get more light, capturing overall more Red photons than the RGB filter case --- mixed together with more Green and Blue photon counts. But, when you want to reconstruct the color, R' is not the total number of R photons counted (you don't get to measure that directly), or a value extractable from each individual pixel. In order to figure out the R,G,B color of the incident light, you need to take sums and differences of the W+-X pixels --- because you sometimes have to subtract off counts from another pixel, you can only "recover" fewer effective pure-color counts (though still mixed with the larger "noise" of the original brighter signal).
p.3 #2 · Panasonic Diffractive Color Filter/Splitter patent
mpmendenhall wrote:
Nope, not quite. At each pixel I have, e.g., a W-B or W+R (or, in my example case, W, W-R, or W-B). Thus I do get more light, capturing overall more Red photons than the RGB filter case --- mixed together with more Green and Blue photon counts. But, when you want to reconstruct the color, R' is not the total number of R photons counted (you don't get to measure that directly), or a value extractable from each individual pixel. In order to figure out the R,G,B color of the incident light, you need to take sums and differences of the W+-X pixels --- because you sometimes have to subtract off counts from another pixel, you can only "recover" fewer effective pure-color counts (though still mixed with the larger "noise" of the original brighter signal)....Show more →
Hmm I think we are not quite talking about the same thing. Anyways, I will have to get back to this later - time to head off to real work
p.3 #3 · Panasonic Diffractive Color Filter/Splitter patent
theSuede wrote:
No, a positive tristimuli of White-Yellow-Cyan can never combine to make a green color. It would not be able to make blue or red color either... It only "kind of" works in a sensor because you can subtract channel values from each other.
The only way that you could use subtraction in a light emitting device would be to use phased light like in a laser, and I'm not entirely sure that I would want that in a screen....
p.3 #4 · Panasonic Diffractive Color Filter/Splitter patent
So basically as long as the sensor pixels can't detect full color(RGB) there will always be noise caused by uncertainty in the calculations to convert the data to RGB. Is that right?
p.3 #5 · Panasonic Diffractive Color Filter/Splitter patent
LightShow wrote:
So basically as long as the sensor pixels can't detect full color(RGB) there will always be noise caused by uncertainty in the calculations to convert the data to RGB. Is that right?
I think it's the using of mixed colors to construct the color channels which increases the impact of (shot?) noise in the color channels. In other words: noise in the other colors that are mixed in come on top of the noise in the color you actually want to detect.
