Color Plates

Figure 6.28 Temporal false colouring. Images taken at different times are assigned to different channels, with the resultant output showing coloured regions where there are temporal differences.

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Figure 6.29 Pseudocolour or false colour mapping using lookup tables.

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Figure 6.30 RGB colour space. Top left: combining red, green and blue primary colours; bottom: the red, green and blue components of the colour image on the top right.

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Figure 6.32 CMY colour space. Top left: combining yellow, magenta and cyan secondary colours; bottom: the yellow, magenta and cyan components of the colour image on the top right.

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Figure 6.34 YCbCr colour space. Top left: the Cb–Cr colour plane at mid luminance; bottom: the luminance and chrominance components of the colour image on the top right.

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Figure 6.36 HSVand HLS colour spaces. Left: the HSV cone; centre: the HLS bi-cone; right: the hue colour wheel.

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Figure 6.37 HSVand HLS colour spaces. Top left: HSV hue colour wheel, with saturation increasing with radius; middle row: the HSV hue, saturation and value components of the colour image on the top right; bottom row: the HLS hue, saturation and lightness components.

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Figure 6.40 Chromaticity diagram. The numbers are wavelengths of monochromatic light in nanometres.

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Figure 6.41 Device dependent r–g chromaticity.

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Figure 6.43 Simple colour correction. Left: original image captured under incandescent lights, resulting in a yellowish-red cast; centre: correcting assuming the average is grey, using Equation 6.86; right: correcting assuming the brightest pixel is white, using Equation 6.88.

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Figure 6.44 Correcting using black, white and grey patches. Left: original image with the patches marked; centre: stretching each channel to correct for black and white, using Equation 6.90; right: adjusting the gamma of the red and blue channels using Equation 6.91 to make the grey patch grey.

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Figure 7.24 Using a two-dimensional histogram for colour segmentation. Left: U–V histogram using Equation 6.61; centre: after thresholding and labelling, used as a two-dimensional lookup table; right: segmented image.

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