I'm working on computing MTF plots for smartphone camera. I've a working code in Python inspired by plenty of codes found online, MATLAB, Peter Burns and his sfrmat etc.. which computes the data from a chart I've created using the slanted edge algorithm, and is displayed as Line Pairs per Pixels.
However, to compare smartphones between them, I've found that displaying the MTF plot with Line Pairs per Picture Height should be better. How can i go from one to the other ? Also, as I extract a ROI of the chart, is the Picture Height the original one, or only of the ROI ?
Finally, I've seen on Imatest that they discuss Line Pairs per Object Distance (https://www.imatest.com/docs/sharpness/#freq_units) but I honestly don't understand it. Can someone explain it a bit ? Could it be capable of giving information on the smallest possible details distinguishable ?
Thank you already