Originally Posted by wareya
It's all buffered, so there's not really a single physical quality that affects the final sensitivity. It's 100% up to the sensor how much subpixel movement to buffer before outputting a pixel of movement. Depending on how the given correlation logic calculates subpixel movements, there might not even be a "default" buffer size, aside from what's reasonable in terms of sensitivity and jitter.
when you're moving at a speed where consecutive images are shifted by e.g. 5 pixels, is the physical size of those 5 pixels (projected on the mousepad) not relevant?
if i understand you correctly, what you're saying/thinking is more relevant for this type of sensor:
where framerates are high enough that consecutive images are only displaced by subpixels
Now, there IS a standard of "mouse moves one sensor pixel in one frame", but that goes to the wind when you have a dynamic framerate,
"mouse moves one sensor pixel in one frame" corresponds to a speed. not sure how that's relevant here. it should be clear that, ignoring errors, framerate does not affect cpi/sensitivity.
and again, it has nothing to do with what CPI values are good. There's also "actual sensor image density on mousepad", but it still doesn't directly affect what CPI value is "optimal" or "default".
i'm not saying that (what i call) base cpi is the best cpi to use or anything. though it could be...
Calling anything "base CPI" is extremely misleading to people who don't have the time or patience to go so far into things.
well blame skylit