question about latitudeCorrection3 function

[why-scholar]

hello,
in the file corrector.cpp, function of latitudeCorrection3() utilizes getPhi() to estimate the latitude and longitude, which later used for estimate corresponding shpere coordinates. Though I understand the forward projection from shpere to cylinder coordinates based on the provided thesis, however I am confused about backward projection from cylinder to shpere coordinates. Could you please provide some corresponding references? I think it is will very helpful for me to understand the code snippets.

[wangzhizhou]

In my opinion, the image is produced in cylinder, so every location on the cylinder(specified size) should have a corresponding location on the sphere, and if we use forward projection to produce the cylinder, there will be some corresponding relation be losed, because I don't want to use interpolation pixel value. So，I specified size the cylinder, for every location on the cylinder, I use the backward projection to get the corresponding pixed on the original image. though the backward projection may lose some corresponding relations, but they are not scatter, but continue area.

[why-scholar]

Hi,
Thanks for your reply. According to the forward projection from sphere to cylinder in your paper, I could not get the the backward projection formula. This makes me confused for your code. Could you please provide me with the backward projection formula? I think it will be very useful for me to understand your code.

[wangzhizhou]

Maybe I should refine this project to make it more readable. At that time I create this project, my skill in programming is basic, so, if someone can work with me, it will be better. I plan to refine this project during spare time