It can be used with a single image. You have to inform the program of the focal length used and camera crop factor, and type of lens (rectilinear, fish-eye,...). It will then allow you to transform the image into any other kind of projection.
It can also correct barrel/cushion distortion if you inform about their value.
It's a bit tricky to use, but it works well.
What is this? Toronto's urban redundancy?

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BR
That was me cloning out some reflective bits on that laminated wall map! 
I'm surprised anyone noticed the cartography falsification! ...good call! 
About the program; yes, I did key in as much of the information about my lens as I could get my hands on but some of the values it was asking for, I couldn't readily find any documentation for and quickly got mad at the program for asking me such tough questions!
Cheers!




