Color information can be very useful for the initial detection of specific objects. For example, the detection of road signs in a driver-assistance application could rely on the colors of standard signs in order to extract potential road sign candidates quickly. The detection of skin color is another example in which the detected skin regions could be used as an indicator of the presence of a human in an image; this approach is very often used in gesture recognition, where skin tone detection is used to detect hand positions.
In general, to detect an object using color, you need to first collect a large database of image samples that contain the object captured from different viewing conditions. ...
