12. A computer-implemented method for identifying genres of a document, comprising: on a computer system having one or more processors executing one or more programs stored on memory of the computer system: receiving a document image of the document; segmenting the document image into a plurality of tiles of the document image, wherein the tiles in the plurality of tiles are sized so that document page features are identifiable; computing features of the document image and the plurality of tiles; and identifying one or more genres associated with the document image based on the features of the document image and the features of the plurality of tiles, wherein identifying the one or more genres associated with the document image based on the features of the document image and the features of the plurality of tiles of the document image includes: applying a first set of genre classifiers to the features of the document image and the features of the plurality of tiles associated with the document image to produce a first set of scores, wherein the first set of genre classifiers is trained based on a first subset of training document images, and wherein parameters of the first set of genre classifiers are tuned based on a second subset of the training document images; applying a second set of genre classifiers to the features of the document image and the plurality of tiles associated with the document image to produce a second set of scores, wherein the second set of genre classifiers is trained based on the second subset of the training document images and wherein parameters of the second set of genre classifiers are tuned based on the first subset of the training document images; combining the first set of scores and the second set of scores to produce a combined set of scores; and identifying the one or more genres associated with the document image based on the combined set of scores.
12. A computer-implemented method for identifying genres of a document, comprising: on a computer system having one or more processors executing one or more programs stored on memory of the computer system: receiving a document image of the document; segmenting the document image into a plurality of tiles of the document image, wherein the tiles in the plurality of tiles are sized so that document page features are identifiable; computing features of the document image and the plurality of tiles; and identifying one or more genres associated with the document image based on the features of the document image and the features of the plurality of tiles, wherein identifying the one or more genres associated with the document image based on the features of the document image and the features of the plurality of tiles of the document image includes: applying a first set of genre classifiers to the features of the document image and the features of the plurality of tiles associated with the document image to produce a first set of scores, wherein the first set of genre classifiers is trained based on a first subset of training document images, and wherein parameters of the first set of genre classifiers are tuned based on a second subset of the training document images; applying a second set of genre classifiers to the features of the document image and the plurality of tiles associated with the document image to produce a second set of scores, wherein the second set of genre classifiers is trained based on the second subset of the training document images and wherein parameters of the second set of genre classifiers are tuned based on the first subset of the training document images; combining the first set of scores and the second set of scores to produce a combined set of scores; and identifying the one or more genres associated with the document image based on the combined set of scores. 15. The computer-implemented method of claim 12 , wherein segmenting the document image into the plurality of tiles includes segmenting the document image into a specified number of tiles of a specified uniform dimension, wherein the specified uniform dimension is selected so that features of the tiles are exhibited.