ABSTRACT
As mentioned in the previous chapter, the interaction of light rays with an object systematically alters light according to the surface properties of the object. This means that the pattern of change across a set of light rays provides direct, reliable information about the object. This can also be seen by permuting the pixels of an image (Figure 6.1). Although the exact same pixels are available in both images, the permutation has resulted in the loss of meaningful information. Thus, a statistical assessment of an image based on individual pixels alone will give only very partial insight into the structure of an image.
