Update readme

Air-Piano/readme.md

@@ -6,17 +6,16 @@ Air Piano is a computer vision based project that allows you to play a virtual p
 * First, the hand is detected using the the black color mask we created using the HSV scale. For this purpose, I chose to wear a pair of black gloves because detecting the skin color was comparitively tougher and would have deprived the project from generalisation.
 
 * After the hand is detected, we draw a convex hull, to find the surrounding convex polygon. From this polygon we extract the finger-tips using the convexity defects function. The convexity defect function returns three points out of which our interest is only in the first set of points.(Read more through the links)
-
 There is also a filter applied to get just the fingertips using the distance between the points, while you may also chose to use the angle between the fingers to achieve the same.
 
 * The last part includes the PyAutoGUI library which allows you to do the keyboard operations depending on the co-ordintates of you hand movements(fingertips to be precise).
 
-![Demonstration](Air-Piano/airpiano.png?raw=true "Demonstration picture")
+![Demonstration](https://github.com/umar07/OpenCV-Projects/blob/main/Air-Piano/airpiano.png?raw=true "Demonstration picture")
 
 
 The following are the sources I used to learn and that helped me build this project successfully-
-1. [Finger-tip detection](https://docs.opencv.org/master/dc/da5/tutorial_py_drawing_functions.html)
+1. [Finger-tip detection](https://abnerrjo.github.io/blog/2015/11/15/fingertip-detection-on-opencv/)
 2. [Convex Hull](https://docs.opencv.org/3.4/d7/d1d/tutorial_hull.html)
-3. [convexity Defects](https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_contours/py_contours_more_functions/py_contours_more_functions.html)
+3. [Convexity Defects](https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_contours/py_contours_more_functions/py_contours_more_functions.html)
 4. [Hand Detection](https://medium.com/analytics-vidhya/hand-detection-and-finger-counting-using-opencv-python-5b594704eb08)