I see: https://photo.stackexchange.com/a/80093
But im not sure how to use this info, obviously in each mobile phone camera, the lens and sensor is different....but how can I start with my own phone to begin with?
Ah I see, so lpmm is what we used in the past, MTF is what we use now.
Are there any free available programs that are recommended to calculate MTF of a smartphone?
I'm not sure how easy it would be to separate the optical performance of a smart phone from the influence of the digital processing built into that smart phone.
What might appear to be evidence of resolution may simply be results of the sharpening algorithms - or maybe not. I don't think you can decouple the optics from the processing.
Not sure what you are trying to do. These types of measurements require precise scientific instrumentation - not something you can rig up in a diy project. MTF is not one number, it is in form of a chart that takes many measurements along the diameter of the lens.
If you want to do bare bones "resolution" measurement in the form of lpmm (lines per mm) or lpi (lines per inch,) you can print out the test pattern from the link provided earlier, shoot it and then analyze in Photoshop to see where the the parallel lines stop being distinct and start merging with each other. That would be your minimum resolution.
.... If you want to do bare bones "resolution" measurement in the form of lpmm (lines per mm) or lpi (lines per inch,) you can print out the test pattern from the link provided earlier, shoot it and then analyze in Photoshop to see where the the parallel lines stop being distinct and start merging with each other. That would be your minimum resolution. :Niranjan.