code for detecting license plate

here's my code so far... i want to get the coordinate of the lp then crop the lp...

[filename,pathname]=uigetfile('*.jpeg;*.png;*.jpg;*.tif','Choose Image : ');

g= imread([pathname,filename]);

g=imresize(g,[400 NaN]);

handles.g=g;

guidata(hObject,handles); axes(handles.axes1);

imshow(g);

gray= rgb2gray(g);

axes(handles.axes2);

imshow(gray);

adjust= imadjust(gray,[0.3,0.6],[]);

axes(handles.axes3);

imshow(adjust);

filter= medfilt2(adjust);

axes(handles.axes4);

imshow(filter);

sobel= edge(filter,'sobel',0.30,'both');

axes(handles.axes5);

imshow(sobel);

se= [1;1;1];

erode= imerode(sobel,se);

axes(handles.axes6);

imshow(erode);

sa= strel('disk',11);

H= imclose(erode,sa);

axes(handles.axes7);

imshow(H);

F= bwareaopen(H,1000);

axes(handles.axes8);

imshow(F);

thanks in advance