Detecting online abuse in images
Tools for analyzing images are disclosed. In some cases, the images are analyzed in order to determine whether a particular web site and/or email message is part of an illegitimate online activity. In an aspect, an image analysis process comprises comparing a suspect image with one or more elements of interest (which can include images, words, etc.) by generating fingerprints characterizing the suspect image and the elements of interest, to allow for a quantitative comparison.
1. A computer system for analyzing an image, the system comprising:
a database configured to store of image templates for a plurality of elements of interest, each of the image templates comprising a candidate fingerprint, each candidate fingerprint comprising a plurality of candidate fingerprint signals;
a processor in communication with the database; and
a computer readable medium having embodied thereon a software program executable by the processor, the software program comprising:
a) an image preprocessing and segmentation component configured to receive a suspect image and identify, within the suspect image, a suspect blob having an associated set of suspect blob boundaries;
b) a fingerprint generation component configured to create a suspect fingerprint, based at least in part on the suspected blob boundaries, the suspect blob fingerprint comprising a set of suspect blob fingerprint signals; and
c) a fingerprint matching component configured to calculate a similarity score for an element of interest, the similarity score being based on a plurality of similarity measures between the suspect fingerprint and a candidate fingerprint for the element of interest, each of the similarity measures being calculated based on a suspect fingerprint signal and a respective candidate fingerprint signal, and to determine, based at least in part on the similarity score, determine whether the suspect image is a likely match for the element of interest.
2. A computer system as recited in claim 1 , wherein the fingerprint matching component is configured to calculate similarity scores for a plurality of elements of interest, and based on the respective similarity scores, determine which of the elements of interest is a best match for the suspect image.
3. A computer system as recited in claim 1 , wherein the fingerprint matching component is configured to calculate a plurality of similarity scores, the plurality of similarity scores comprising:
a composite similarity score based on a weighted composite of the plurality of similarity measures; and
a minimum individual similarity score based on a minimum value from among the plurality of similarity measures.
4. A computer system as recited in claim 3 , wherein the determining whether the suspect image is a likely match comprises:
comparing the composite similarity score with a first threshold having a first value; and
comparing the minimum individual similarity score with a second threshold having a second value.
5. A computer system as recited in claim 4 , wherein the first value and the second value are the same value.