8. A computer system for segmenting a document image, comprising: a processor for executing computer program instructions; a non-transitory computer-readable storage medium storing executable computer program instructions, the computer-readable storage medium comprising: a score module configured to identify text quality scores associated with a plurality of digital text characters generated from the document image, a text quality score for a target character describing a likelihood of the target character being at a location of the target character within the document image; a score analysis module configured to: identify a plurality of subsets of characters having associated text quality scores that differ from text quality scores associated with neighboring characters in the document image by more than a threshold value; segment the document image into a plurality of segments associated with different text quality scores responsive to the identified plurality of subsets of characters; and determine a representative text quality score for each segment of the document image; and a text quality database configured to store the representative text quality scores in association with the segments.
8. A computer system for segmenting a document image, comprising: a processor for executing computer program instructions; a non-transitory computer-readable storage medium storing executable computer program instructions, the computer-readable storage medium comprising: a score module configured to identify text quality scores associated with a plurality of digital text characters generated from the document image, a text quality score for a target character describing a likelihood of the target character being at a location of the target character within the document image; a score analysis module configured to: identify a plurality of subsets of characters having associated text quality scores that differ from text quality scores associated with neighboring characters in the document image by more than a threshold value; segment the document image into a plurality of segments associated with different text quality scores responsive to the identified plurality of subsets of characters; and determine a representative text quality score for each segment of the document image; and a text quality database configured to store the representative text quality scores in association with the segments. 12. The system of claim 8 , wherein the threshold value defines a maximum difference of text quality scores for characters to be included in a given subset of characters.