mod Readme.md

Readme.md

@@ -5,17 +5,17 @@ This Python Opencv Lab is split into two parts for morning and afternoon.
 1. [Lab_1/](./Lab_1) : Image Operation, Image Smoothing, Image Denoising, Image PCA & Classification
 2. [Lab_2/](./Lab_2) : Color and Texture Segmentation (Clustering) , Recognition with Bag of Visual Words
 
-### Briefly Introdiction
+### Briefly Introduction
 
-[Introduction.pdf](./Introduction.pdf)
+[python_opencv_lab.pdf](./python_opencv_lab.pdf)
 
 ### Reference
 The lab practice referred to [OpenCVtutorial](http://opencv-python-tutroals.readthedocs.io/en/latest/index.html) and NTU Deep Learning for Computer Vision (DLCV) course [website](http://vllab.ee.ntu.edu.tw/dlcv.html).
 
 ### Prerequisites
 - python3.5+
-- opencv-python:   ```pip3 install opencv-python ```
--  numpy: ``` pip3 install numpy ```
+- opencv-python: ```pip3 install opencv-python ```, ```pip3 install opencv-contrib-python ```
+- numpy: ``` pip3 install numpy ```
 - matplotlib:  ``` pip3 install matplotlib ```
 - sklearn:  ``` pip3 install sklearn ```
 - scipy: ```pip3 install scipy```