readme
This is a script I wrote which finds quadrilateral surface on image, transforms this image to make this surface rectangular and then crops it to this surface only.
It works well in many cases, i.e. for extracting presentation slides
from photos (clearly visible, bright trapezoids on dark background),
it performs worse if there is a lot of other shapes of similar luminosity
as main object - it needs improvements in this department.
Samples included.
most important functions used
- cv2.findContours()
- cv2.findHomography()
- cv2.warpPerspective()
usage
- place images in input dir, open terminal, write make, execute, check output dir
- use by command:
python find_rect_and_transform.py <input files> <output dir>requirements
- Python 2
- OpenCV 2
- NumPy