and widths. The image is depicted in four different graphical representations: (a)
the pixel values mapped in gray levels (low values are dark and high values are
bright gray tones); (b) the pixel values also mapped in grayscale but in a reverse
order; (c) the same image but as a top view of a shaded surface; and (d) a mesh
plot of the same surface.
8.3.1 Threshold Decomposition
The threshold sets of a grayscale image contain all the pixels of the binary
objects obtained by thresholding the image at all (e.g., 256) gray levels. Thresh-
old decomposition of a grayscale image is the process that creates the threshold
sets. A level component in a grayscale image is defined as a connected set of
pixels in a threshold set of the image at a particular gray ...