1. A method for selecting fields of an electronic form for automatic population with candidate text segments that are obtained by capturing an image of a document, applying optical character recognition to the captured image to identify textual content, and tagging candidate text segments in the textual content for fields of the form, the method comprising: for each of a plurality of fields of an electronic form, estimating a manual entry time and a manual correction time for the field, wherein the estimated manual entry time is an estimated time period for a user to enter a text segment into the field without automatic population and the estimated manual correction time is an estimated time period for a user to correct a text segment in the field after automatic population; computing a field exclusion function based on the estimated manual entry time and the estimated manual correction time, the computation of the field exclusion function further based on at least one parameter selected from: a text length parameter, an optical character recognition error rate, a computed tagging error rate, and a field relevance parameter which has been assigned to a respective field; and determining whether to select the field for automatic population based on the computed field exclusion function.