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 lensfunpy
cam_maker = 'NIKON CORPORATION'
cam_model = 'NIKON D3S'
lens_maker = 'Nikon'
lens_model = 'Nikkor 28mm f/2.8D AF'
db = lensfunpy.Database()
cam = db.find_cameras(cam_maker, cam_model)[0]
lens = db.find_lenses(cam, lens_maker, lens_model)[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
focal_length = 28.0
aperture = 1.4
distance = 10
image_path = '/path/to/image.tiff'
undistorted_image_path = '/path/to/image_undist.tiff'
im = cv2.imread(image_path)
height, width = im.shape[0], im.shape[1]
mod = lensfunpy.Modifier(lens, cam.crop_factor, width, height)
mod.initialize(focal_length, aperture, distance)
undist_coords = mod.apply_geometry_distortion()
im_undistorted = cv2.remap(im, undist_coords, None, cv2.INTER_LANCZOS4)
cv2.imwrite(undistorted_image_path, im_undistorted)Installation on Linux
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On Ubuntu, you can get (an outdated) version with: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 GIT repository:
git clone git://git.code.sf.net/p/lensfun/code lensfun
cd lensfun
cmake .
sudo make installAfter that, it’s the usual pip install lensfunpy.
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.
Installation on Windows and Mac OS X
Binaries are provided for Python 2.7, 3.3 and 3.4 for both 32 and 64 bit. These can be installed with a simple pip install --use-wheel lensfunpy (or just pip install lensfunpy if using pip >= 1.5).
Binaries for other Python versions are currently not produced but if there is a need then this is possible as well. In that case, just contact me.
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