1. A method for image categorization comprising: displaying a first image and a second image on a first video display; receiving, from a user input device, a first user input associated with a first comparison between the first image and the second image, wherein the first input describes a characteristic shared between the first image and the second image based on the comparison; in response to receipt of the first user input, displaying the first image and a third image on the first video display, wherein the third image is different than the second image; receiving, from the user input device, a second user input associated with a second comparison between the first image and the third image; assigning the first image to a first category based at least in part on the first user input and the second user input; wherein the first image and the second image are further displayed with a first list of prohibited categorization data.