Python wrapper for the lensfun library
Project description
lensfunpy is an easy-to-use Python wrapper for the lensfun library.
Sample code
How to find cameras and lenses:
import lensfun
camMaker = 'NIKON CORPORATION'
camModel = 'NIKON D3S'
lensMaker = 'Nikon'
lensModel = 'Nikkor 28mm f/2.8D AF'
db = lensfun.Database()
cam = db.findCameras(camMaker, camModel)[0]
lens = db.findLenses(cam, lensMaker, lensModel)[0]
print cam
# Camera(Maker: NIKON CORPORATION; Model: NIKON D3S; Variant: ;
# Mount: Nikon F AF; Crop Factor: 1.0; Score: 0)
print lens
# Lens(Maker: Nikon; Model: Nikkor 28mm f/2.8D AF; Type: RECTILINEAR;
# Focal: 28.0-28.0; Aperture: 2.79999995232-2.79999995232;
# Crop factor: 1.0; Score: 110)How to correct lens distortion:
import cv2 # OpenCV library
focalLength = 28.0
aperture = 1.4
distance = 10
imagePath = '/path/to/image.tiff'
undistortedImagePath = '/path/to/image_undist.tiff'
im = cv2.imread(imagePath)
height, width = im.shape[0], im.shape[1]
mod = lensfun.Modifier(lens, cam.CropFactor, width, height)
mod.initialize(focalLength, aperture, distance)
undistCoords = mod.applyGeometryDistortion()
imUndistorted = cv2.remap(im, undistCoords, None, cv.INTER_LANCZOS4)
cv2.imwrite(undistortedImagePath, imUndistorted)Installation
You need to have the lensfun library installed to use this wrapper.
On Ubuntu, you can get (an outdated) version with:
sudo apt-get install liblensfun0 liblensfun-devOr install the latest developer version from the SVN repository:
svn co svn://svn.berlios.de/lensfun/trunk lensfun
cd lensfun
./configure
sudo make installTroubleshooting
If you get the error “ImportError: liblensfun.so.0: cannot open shared object file: No such file or directory” when trying to use lensfunpy, then do the following:
echo "/usr/local/lib" | sudo tee /etc/ld.so.conf.d/99local.conf
sudo ldconfigThe lensfun library is installed in /usr/local/lib and apparently this folder is not searched for libraries by default in some Linux distributions.
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