The earlier recipes taught you how to encapsulate an algorithm into a class. This way, the algorithm becomes easier to use through a simplified interface. Encapsulation also permits you to modify an algorithm's implementation without impacting the classes that use it. This principle is illustrated in the next recipe, where we will modify the ColorDetector class algorithm in order to use another color space. Therefore, this recipe will also be an opportunity to introduce color conversions with OpenCV.
The RGB color space is based on the use of the red, green, and blue additive primary colors. These have been selected because when they are combined together, they can produce a wide gamut of different colors. In fact, the human visual system is also based on the trichromatic perception of colors, with cone cell sensitivity located around the red, green, and blue spectrum. It is often the default color space in digital imagery because that is the...