14. A system comprising: a data storage device storing machine readable instructions; and a processor that interacts with the data storage device and executes the machine readable instructions, wherein execution of the machine readable instructions cause the processor to perform operations comprising: obtaining, by one or more computers and for a first object in an image, a first set of text labels using visual data extracted from the image; obtaining, by the one or more computers and for a second object in the image, a second set of text labels using the visual data extracted from the image; generating, for various pairs of text labels, a relation score based on a number of co-occurrences of the text labels in text of web pages, wherein each pair of text labels includes a text label from the first set and a text label from the second set; and labeling, by the one or more computers, the image with a given pair of text labels, from among the various pairs of text labels, based on solving a global optimization problem utilizing at least the relation score, wherein the relation score for the given pair of text labels meets a specified threshold relation score.
14. A system comprising: a data storage device storing machine readable instructions; and a processor that interacts with the data storage device and executes the machine readable instructions, wherein execution of the machine readable instructions cause the processor to perform operations comprising: obtaining, by one or more computers and for a first object in an image, a first set of text labels using visual data extracted from the image; obtaining, by the one or more computers and for a second object in the image, a second set of text labels using the visual data extracted from the image; generating, for various pairs of text labels, a relation score based on a number of co-occurrences of the text labels in text of web pages, wherein each pair of text labels includes a text label from the first set and a text label from the second set; and labeling, by the one or more computers, the image with a given pair of text labels, from among the various pairs of text labels, based on solving a global optimization problem utilizing at least the relation score, wherein the relation score for the given pair of text labels meets a specified threshold relation score. 18. The system of claim 14 , wherein generating the relation score comprises generating the relation score based on co-occurrences that are within a limit selected from the group consisting of: adjacent words or terms, a number of words, an area, a same sentence, a same paragraph, a same page, and a same document.