Simple utility to apply 7 parameter distortion (k1, k2, p1, p2, k3, cx, cy) to an image as per the equations here. Made for the sake of learning and to demonstrate the effects of the individual parameters for a university project on camera calibration. Uses nearest neighbour interpolation.
Requires that lodepng.h and lodepng.cpp from LodePNG (for PNG input/output) and nanoflann.hpp from nanoflann (for fast approximate nearest neighbour interpolation with a KD-tree) are present in the source directory, alongside main.cpp.
Usage: warp7p <input.png> <k1> <k2> <p1> <p2> <k3> <cx> <cy>
Example: warp7p test.png -0.4 0 -0.05 0.1 0 0.5 0.5
Where test.png is:
Produces the resulting out.png:
The effects of individual parameters:
k1 (positive)
k1 (negative)
k2
k3
p1
p2
License: GPLv2