Color image processing and color models
Color image processing
The use of color in image processing is motivated by two principal factors:
1. The fact that color is a powerful descriptor it often simplifies object identification and extraction from a given scene
2. A human can discern thousands of colors shades and intensities, compared to about only a few dozens of shades of gray.
The use of color in image processing is motivated by two principal factors:
1. The fact that color is a powerful descriptor it often simplifies object identification and extraction from a given scene
2. A human can discern thousands of colors shades and intensities, compared to about only a few dozens of shades of gray.
Characterizing colors
The characteristics generally used to distinguish one color from another are:
1. Hue:
Hue is an attribute associated with the dominant wavelength in a mixture of white light. It represents the dominant color as perceived by the observer.
2. Saturation:
Saturation refers to the relative purity or amount of white light mixed with a hue. The pure spectrum colors are fully saturated. Colors such as pink (red + white) are less saturated, with degree of saturation being inversely proportional to the amount of white light added.
3. Brightness:
Brightness refers to the intensity of light.
The characteristics generally used to distinguish one color from another are:
1. Hue:
Hue is an attribute associated with the dominant wavelength in a mixture of white light. It represents the dominant color as perceived by the observer.
2. Saturation:
Saturation refers to the relative purity or amount of white light mixed with a hue. The pure spectrum colors are fully saturated. Colors such as pink (red + white) are less saturated, with degree of saturation being inversely proportional to the amount of white light added.
3. Brightness:
Brightness refers to the intensity of light.
Hue and saturation together are called chromaticity, and therefore, a color may be characterized by its brightness and chromaticity.
Color models:
The color models (also called color space or color system) facilitate the specification of colors in some standard or generally accepted way.
Different color models available are:
1. RGB
2. CMY(CMYK)
3. HSI
4. HSV
5. YIQ
6. YUV(YCbCr)
The color models (also called color space or color system) facilitate the specification of colors in some standard or generally accepted way.
Different color models available are:
1. RGB
2. CMY(CMYK)
3. HSI
4. HSV
5. YIQ
6. YUV(YCbCr)
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