imageprocessing-electronicpublications / warp7p

Apply 7 camera distortion parameters to an image.

warp7p

Description

Simple utility to apply 7+1 parameter distortion (k1, k2, p1, p2, k3, cx, cy, mc) 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

• lodepng.h and lodepng.cpp from LodePNG (for PNG input/output)
• 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> <output.png> [k1=0.0] [k2=0.0] [p1=0.0] [p2=0.0] [k3=0.0] [cx=0.5] [cy=0.5] [mc=1.0]

Example

warp7p test.png testout.png -0.4 0 -0.05 0.1 0 0.5 0.5 2.0

Where test.png is:

Produces the resulting out.png:

The effects of individual parameters:

k1 (positive)

k1 (negative)

k2

k3

p1

p2

License

GPLv2