1. A method, in a data processing system comprising at least one processor and at least one memory, for generating alternative text descriptions for images in electronic documents, comprising: analyzing, by the data processing system, an original image embedded in an electronic document to generate a data pattern for the image; performing, by the data processing system, a matching operation to identify one or more similar images in other electronic documents from one or more sources of electronic documents based on the generated data pattern; extracting, by the data processing system, textual description information associated with the one or more similar images from data associated with the one or more similar images; generating, by the data processing system, an alternative text description for the original image based on the extracted textual description information associated with the one or more similar images; and storing, by the data processing system, the alternative text description for the original image in association with the original image.