You have successfully implemented Optical Character Recognition (OCR) in your DLP environment
However in the Enforce console, you notice a significant number of alerts with the code 4803 - OCR Request was not successful
Clicking on the details of the alerts shows the subcatagory: Image Size Error
These alerts are because the OCR pre-filter on the detection server is mistakenly passing images to the OCR servers that are of incorrect size and are unsuitable for OCR extraction.
The OCR server then drops that file and posts the alert to the Enforce
Release : 15.x
Component : OCR
Alerts of this type can be safely ignored, no extractable data was available in those images in the first place, so OCR detection is not failing.
A fix for the OCR pre-filter component has been targeted for a future version of DLP