GEOMETRICAL IMAGE MODIFICATION EXERCISES 369
For color images, the geometrical image modification methods discussed in
this chapter can be applied separately to the red, green and blue components of
the color image. Vrhel (19) has proposed converting a color image to luma/
chroma (or lightness/chrominance) color coordinates and performing the geo-
metrical modification in the converted color space. Large support interpolation
is then performed on the luma or lightness component, and nearest neighbor
interpolation is performed on the luma/chrominance components. After the geo-
metrical processing is completed, conversion to RGB space is performed. This
type of processing takes advantage of the tolerance of the human visual system
to chroma or chrominance ...