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I clean maually your image

and results are :

TEXT ETRACTION
langue :fra
moteur : Default, based on what is available.
analyse : Assume a single uniform block of text.
niveau : ligne
image : a.png
Image too small to scale!! (2x48 vs min width of 3)
Line cannot be recognized!!
Image too small to scale!! (2x48 vs min width of 3)
Line cannot be recognized!!
Text:
8212 15 1 4 40
l 7198 7 3 6 40
6307 6 1 5 60
5640 2 3 6 80
4884 1 1 5 80

proba = 94.9853->[2418 x 49 from (34, 47)] : 8212 15 1 4 40

proba = 84.1706->[2452 x 111 from (0, 150)] : l 7198 7 3 6 40

proba = 94.5019->[2417 x 49 from (35, 377)] : 6307 6 1 5 60

proba = 96.1703->[2416 x 49 from (36, 542)] : 5640 2 3 6 80

proba = 94.8845->[2419 x 49 from (33, 707)] : 4884 1 1 5 80

I clean maually your image

and results are : (leptonica1.74.4 and tesseract matser "4.00.00alpha"):

TEXT ETRACTION
langue :fra
moteur : Default, based on what is available.
analyse : Assume a single uniform block of text.
niveau : ligne
image : a.png
Image too small to scale!! (2x48 vs min width of 3)
Line cannot be recognized!!
Image too small to scale!! (2x48 vs min width of 3)
Line cannot be recognized!!
Text:
8212 15 1 4 40
l 7198 7 3 6 40
6307 6 1 5 60
5640 2 3 6 80
4884 1 1 5 80

proba = 94.9853->[2418 x 49 from (34, 47)] : 8212 15 1 4 40

proba = 84.1706->[2452 x 111 from (0, 150)] : l 7198 7 3 6 40

proba = 94.5019->[2417 x 49 from (35, 377)] : 6307 6 1 5 60

proba = 96.1703->[2416 x 49 from (36, 542)] : 5640 2 3 6 80

proba = 94.8845->[2419 x 49 from (33, 707)] : 4884 1 1 5 80