If you have a large digitization project, such as Wikisource, with many pages and books of scanned images and OCR text (originating from different sources and times), how do you assess the OCR quality and determine which pages are in most need of improved OCR or proofreading?
Is spell checking (and a normal dictionary) the only useful tool? Would you count the number of spelling errors, or the ratio of errors to correct words? Has anyone done this?