How to improve license plate location

I dont know what is wrong the result are not good it find maybe 10% of plates. Algoritm is based on vertical and horizontal histogram, quality of picture is realy good and plate is almost at center of picture.

Maybe the problem is in edge detection? is" A=edge(A,'roberts');" enough or i need to use somthing else, or the problem is smowhere else?

http://pastebin.com/CJp9m3d4

this is a sample how plate looks http://www.naklejka.robego.drl.pl/galerie/t/tablice-rejestracyjne_269.jpg is quite simple.

can somebody help me solve this problem? i dont need to find 100% of the plates by 10% is just bad;/ what is wrong???

Answer 1

[Image Analyst]

Try the Computer Vision System Toolbox: http://www.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html

Then once you have the text, find individual characters with OCR: http://www.mathworks.com/help/vision/examples/recognize-text-using-optical-character-recognition-ocr.html?prodcode=VP&language=en