[CyberDildonics]

It's literally the text from the page you linked

"A mosaic image is formed from a database of source images. More particularly, the source images are analyzed, selected and organized to produce the mosaic image. A target image is divided into tile regions, each of which is compared with individual source image portions to determine the best available matching source image by computing red, green and blue channel root-mean square error. The mosaic image is formed by positioning the respective best-matching source images at the respective tile regions."

[alok-g]

I think you took that from the abstract. The abstract, description, or title, of a patent do not determine what a parent covers or not! That is determined by the claims of a patent. The abstract/description/title play a relatively insignificant legal role, these do come in only in some indirect ways.

Please take a look at the claims I have cited in this comment chain, and also read about the importance and relevance of the claims from the links I recommended.

When reading a patent to understand what it covers or not, it's recommended to start with the independent claims.

Hope this helps. :-)

[CyberDildonics]

Which claim specifically do you think makes it impossible for someone else to make a photomosaic?

Please read carefully to realize that there were multiple commercial software programs that did this over 20 years ago.