Fundamentals of Digital Images
Definition
Def Image An image is a function
of spatial coordinates, where and is the intensity of the image at that point (pixel).
Colour Spaces
Definition
Def RGB Space The RGB space has three coordinates
denotes the red, green and blue channels respectively. The ranges are .
Definition
Def HSV Space The HSV space has three coordinates
denotes the hue, saturation and value(brightness) respectively. The ranges are , and .
Comment
Advantages of HSV colour-space:
- Intuitive representation of colors: It provides an intuitive representation of colors that is more natural to the human perception of color.
- Separation of color and brightness: It separates color and brightness information into different components, which makes it easier to adjust color without affecting brightness.
- Robustness to lighting variations: It is more robust to lighting variations than other color spaces, such as RGB, because it separates brightness information from color information.
- Approximately uniform color spacing: The HSV color space has a nearly uniform color spacing, which means that the perceptual difference between colors is roughly equal.
Theorem
Thrm One can transform from RGB space to HSV space by following formula: Let
. Then