1. A method to automatically detect placement of an advertisement in a periodical or book comprising: obtaining printed-media information representing a first printed periodical or printed book in which the advertisement appears, the printed-media information comprising at least one of source information, a publication name, a publication title, a publication date, a publisher name, or a page number of the first printed periodical or printed book; computing, using a processor, a first image feature vector from the advertisement; comparing the first image feature vector to a second image feature vector; when the first image feature vector substantially matches the second image feature vector, storing the printed-media information in a database record associated with the second image feature vector, and compiling a list of publications in which advertisements substantially matching the second image feature vector were printed based on the database record.