Update README.md

Author: aferral

README.md

@@ -4,4 +4,7 @@ Implementation based on SFMedu Princeton COS429: Computer Vision http://vision.p
 The objective of this project was to understand  the structure from motion problem so i take the MATLAB code from http://vision.princeton.edu/courses/SFMedu/
 and translate it in python + numpy. The initial version is just a literal translation from the MATLAB code to python (so expect higher run times, if you want a fast and easy to use software see http://ccwu.me/vsfm/)
 
+Requeriments
+Numpy, cv2, https://github.com/dranjan/python-plyfile
+
 For an example just run main.py without any changes. It will generate a point cloud of a jirafe from 5 images included in examples folder. (can take up to 30 m)