For very visually deficient people, the Open Video Magnifier offers an OCR.

The software makes some steps:

- Get the image:

Easy.

- Clusterize the text in some groups & give a logical order:

A lot of clustering algorithm without any order exists already. To give an order to the clusters can be a difficulty :).

Example of a very basic clustering algorithm (kmeans):

Source:

Result:

I will try some algorithm with order later.

- Each group is processed by an open source OCR: GOCR give pretty good results

- Correct the OCR output. Later.

- Give the text to a vocal synthesis. (espeak, festival, etc?)