How to extract number plate from image

i want to extract number plate from image when the caractéristique of the plate is yellow color ,and all

the licence plate are yellow color , so if we can extract the licence plate .

and the résult should be like this image.

please help me

Answer 1

[Image Analyst]

See this: http://www.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html

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