OCR for ALPR question

I'm using build in function ocr in matlab 2014a i try to use it for ALPR.

I have a single sign and it not always find it properly , sam times as a result is empty '' , but when i give to ocr full plate the result it good , how can i fix it??

And a second question is, in example there is sample that recognized text and ignores all non-digit characters is ther a way to recognized only digits and letters. I want to ignore special characters(:'., .....).

Answer 1

[Image Analyst]

Have you tried the Computer Vision System Toolbox?

http://www.mathworks.com/help/vision/ref/ocr.html#bt548t1-2_1

[Lukasz Jarod]

it help me to solve my second question but i dont know kow to fix my first problem.

[Image Analyst]

Look at this site: http://www.visionbib.com/bibliography/contentsactive.html#Active%20Vision,%20Camera%20Calibration,%20Mobile%20Robots,%20Navigation,%20Road%20Following

particularly this section: "15.3.3.7 Road Signs, Traffic Signs, Objects along the Road, Inspections"

It should have some good algorithms that you can use to pick out your signs better.

[Image Analyst]

Try http://www.mathworks.com/matlabcentral/fileexchange/48466-text-recognizer