update README.md

README.md

@@ -19,18 +19,38 @@ OpenCV `dnn` module supports running inference on pre-trained deep learning mode
 
 ## Prerequisites
 
-* tensorflow
+* Tensorflow
 * opencv-python
 * opencv-contrib-python
-* numpy
+* Numpy
+* Keras
+* Matplotlib
+* Pillow
 
-Install the required packages by running the following command:
+Development for this project will be isolated in Python virtual environment. This allows us to experiment with different versions of dependencies.
 
+There are many ways to install `virtual environment (virtualenv)`, see the [Python Virtual Environments: A Primer](https://realpython.com/python-virtual-environments-a-primer/) guide for different platforms, but here are a couple:
+
+- For Ubuntu
 ```bash
-$ pip install -r requirements.txt
+$ pip install virtualenv
+```
+
+- For Mac
+```bash
+$ pip install --upgrade virtualenv
+```
+
+Create a Python 3.6 virtual environment for this project and activate the virtualenv:
+```bash
+$ virtualenv -p python3.6 yoloface
+$ source ./yoloface/bin/activate
 ```
 
-**Note:** This repositoty works on Python 3.x. Using Python virtual environment is highly recommended.
+Next, install the dependencies for the this project:
+```bash
+$ pip install -r requirements.txt
+```
 
 ## Usage
 
@@ -62,8 +82,6 @@ $ python yoloface.py --src 1 --output-dir outputs/
 
 ![Imgur](outputs/outside_000001_yoloface.jpg)
 
-![Imgur](outputs/meeting_11_304_yoloface.jpg)
-
 ## License
 
 This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for more details.