17. The computing system of claim 15 , wherein the logic is first logic, wherein the computer-readable data storage medium is to further store a plurality of known text samples and an image of each known text sample, each known text sample having a given text type, wherein each OCR engine is to generate output text corresponding to the image of each known text sample, wherein the computing system further comprises second logic to, for each OCR engine, compare the output text generated by each OCR engine corresponding to the image of each known text sample with the known text sample, to determine a confidence value of the OCR engine for the given text type of the known text sample, and wherein the text type of the unknown text is one or more of the given text types of the known text samples.
17. The computing system of claim 15 , wherein the logic is first logic, wherein the computer-readable data storage medium is to further store a plurality of known text samples and an image of each known text sample, each known text sample having a given text type, wherein each OCR engine is to generate output text corresponding to the image of each known text sample, wherein the computing system further comprises second logic to, for each OCR engine, compare the output text generated by each OCR engine corresponding to the image of each known text sample with the known text sample, to determine a confidence value of the OCR engine for the given text type of the known text sample, and wherein the text type of the unknown text is one or more of the given text types of the known text samples. 18. The computing system of claim 17 , wherein the second logic, for each OCR engine of one or more of the OCR engines, periodically redetermines the confidence values of the OCR engine.