In this post I talked about how some low-mean-value points in the data set can be truncated on the left of the histogram by in-camera firmware, and discussed a criterion based on signal-to-noise ratio (SNR) for leaving points out of the data set so that they don’t confuse the modeling of the camera-under-test’s read noise…. [Read More]
A test for “ISO-less-ness”
Now that we have the data set described in this post, we can mine it in unconventional ways (as composed to the more-or-less standard look at the data presented yesterday). One thing that I’m usually interested in when I get a new camera is where I should stop turning up the ISO knob and just… [Read More]
Adrift in a sea of acronyms
A reader sent me a message this morning saying that he is confused by all the acronyms associated with the current set of posts, and asked me to post a glossary that he could keep open as he read the others. Here goes: ADC – analog to digital converter CFA – color filter array CSV… [Read More]
Camera modeling details
Warning: this is going to be a geeky, inside-baseball post. Unless you are interested in what goes on behind the curtain when models are fitted to data, I suggest you pass this one by. In the previous post, I talked about using optimum-seeking methods to adjust the three parameters of the modeled camera – full… [Read More]
Modeling ISO-induced variations in read noise
In yesterday’s post, I showed results of the photon transfer analysis programs modeling the Nikon D4’s full well capacity and read noise for each ISO setting of interest. Today, I’d like to show you what happens when you attempt something more challenging: modeling the behavior of the ISO adjustment knob as well. To do this,… [Read More]
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