Isolating a pixel pattern in an image

[Mark E. Powell]

I have a small handler I am trying to chart out and I am stumped as to even how to begin, or if it is even feasible in Rev.

In simplified terms:  suppose I have a gif, all black except for one or more plus symbols that are white. The plus symbol's horizontal stroke being three pixels wide by one high, and the vertical three pixels high by one wide.

How could I go about determining the x and y location of the plus symbols?

Mark