Merge / Blend n frames together

[ChaosKing]

I'm playing around with this OCR script here https://github.com/pocketsnizort/pythOCR

I extracted some text from an old movie but the text it is unstable. My idea is to blend all text-frames togehter to see if this improves the text quality for ocr.

Scroll to 14s: https://www.dropbox.com/s/59sicf9gqosa614/subs.mkv?dl=0

But I don't know how to approach this. I have a scenechanges.csv and now I would need a function to blend (or maybe merge, I don't know whats better) frames from n to m together. Where should I start? Or Maybe someone can give an example.


SceneChanges.csv

[Video Informations]
fps=23.976024
frame_count=2878

[Scene Informations]
frame,is_start,is_end,subimage
0269,1,0,"0269.png"
0326,0,1,""
1071,0,1,""
1072,1,0,"1072.png"
1178,0,1,""
1681,1,0,"1681.png"
1757,0,1,""
1758,1,1,"1758.png"
1759,1,1,"1759.png"
1760,1,1,"1760.png"
1761,1,1,"1761.png"
1762,1,1,"1762.png"
1763,1,0,"1763.png"
1787,0,1,""
1895,1,0,"1895.png"
1943,0,1,""
1945,1,0,"1945.png"
2017,0,1,""
2018,1,0,"2018.png"
2297,1,0,"2297.png"
2377,0,1,""
2479,1,0,"2479.png"
2535,0,1,""
2613,1,0,"2613.png"
2670,0,1,""