How to convert to color images from real-time web camera to grayscale and from grayscale to black & white using C#

Question

To all C# guro's, Please help me to develop a system for my special project as requirement in school. I will use C# in developing this system in Image Processing application that would classify the mango fruits. Here is the problem:

 How to convert color images in webcam to grayscale and from grayscale to black & white.

Chrystler