ABSTRACT
The information contained within a single pixel is essentially just a color, which is normally represented with three values. As discussed in Chapters 4 and 10, we can derive useful information from the analysis of individual pixel values. We can even perform some very elegant image manipulations with the information contained in single pixels. Nonetheless, the information obtained by analyzing single pixels is still very limited. In particular, a single pixel cannot, in principle, tell us anything about the structures depicted in the image. Does the image, say the one in Figure 4.18, depict a bird? Is there a tree present, and if so, where does it start or stop? Is the tree closer to us than the bird or farther away? The information present in a single pixel is not enough to answer such questions.
