Detecting decimal numbers

[Анатолий Паршиков]

Hello. My task - is recognize decimal number. I can use different instrument, but I must solve this problem. I have few images. Some images correctly recognize, some not. 
See my examples:

Result to first image (not correctly): [('1.0', (3, 432, 16, 8)), ('14', (3, 389, 16, 8)), ('18', (3, 345, 15, 8)), ('2.2', (2, 302, 15, 8)), ('2.6', (2, 258, 16, 8)), ('3.0', (2, 215, 16, 8)), ('3.4', (2, 171, 16, 8)), ('3.8', (2, 128, 16, 8)), ('42', (2, 84, 15, 8)), ('46', (2, 41, 16, 8))] 

Result to second image (correctly): [('1.2', (3, 428, 33, 12)), ('1.4', (3, 330, 33, 12)), ('1.6', (3, 232, 33, 12)), ('1.8', (3, 133, 33, 12)), ('2.0', (2, 35, 33, 12))] 

Maybe, it's happens due to bad quality image? 
I must recognize decimal numbers with high accuracy, you have some ideas?
Sorry, my English is not good.