c++ - reverse UndistortRectifyMap -

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i'm making multicamera-stereo calibration program.

my idea rectify each pair of cameras separately.

for example: given 3 cameras compute undistortion , rectification maps (using stereorectify() , initundistortrectifymap()) separately {camera[1] , camera[2]}, {camera[2] , camera[3]} , {camera[1] , camera[3]}.

using remap(), can transform original image (from, lets say, camera[1]) 1 of 2 different rectified images: rectified[1][2] , rectified[1][3].

now, using remap(), point original image, can compute new coordinates separately in rectified[1][2] , rectified[1][3] images.

it works well, need compute these coordinates in opposite direction: point of rectified images need find original coordinates in original image.

how can this?


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