... image)¹

We will generally use the notation $f,g,\ldots$ to refer to images. We will use the notation $I,J,\ldots$ when we want to refer explicitly to gray value images used in experiments.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.