You could also prioritize your search area, assuming you're searching official Wheres Wally? images.
"53 percent of the time Waldo is hiding within one of two 1.5-inch tall bands, one starting three inches from the bottom of the page and another one starting seven inches from the bottom, stretching across the spread."
"53% of the time, Waldo appears in an empirically determined 25% of the page"
If you repeated this with random data, I expect you could find the same results: this does not constitute evidence that Waldo is placed in those bands with priority.
You can mathematically say that 100% of the time, Waldo appears in 0% of the page (defined by individual points rather than areas). This equivalent statement clearly has no predictive power.
In my opinion, it would not be reliable to use this on novel Waldo images.
"53 percent of the time Waldo is hiding within one of two 1.5-inch tall bands, one starting three inches from the bottom of the page and another one starting seven inches from the bottom, stretching across the spread."
http://www.slate.com/articles/arts/culturebox/2013/11/where_...