How to delete the border of the edge for character recognition in matlab?

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farhat on 1 Aug 2013

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https://www.mathworks.com/matlabcentral/answers/83776-how-to-delete-the-border-of-the-edge-for-character-recognition-in-matlab

Dear all, i want to do a segmentation of the character from vehicle plate an do recognition with template matching. But after i do some basic step in image processing, the output image has a border so the border is detected as a another character. How to fix it??

Here is my code :

       citra=imresize(citra,[400 NaN]); 
       citra_bw=rgb2gray(citra); 
        citra_bw= imclearborder(citra_bw);
        imshow(citra_bw);
        citra_filt=medfilt2(citra_bw,[5 5]); 
        se=strel('disk',3);
       citra_dilasi=imdilate(citra_filt,se); 
       citra_eroding=imerode(citra_filt,se); 
       citra_edge_enhacement=imsubtract(citra_dilasi,citra_eroding); 
         imshow(citra_edge_enhacement);
        citra_edge_enhacement_double=mat2gray(double(citra_edge_enhacement)); 
          citra_double_konv=conv2(citra_edge_enhacement_double,[1 1;1 1]); 
          citra_intens=imadjust(citra_double_konv,[0.5 0.7],[0 1],0.1); 
       citra_logic=logical(citra_intens); 
         citra_line_delete=imsubtract(citra_logic(imerode(citra_logic,strel('line',50,0))));
       citra_fill=imfill(citra_line_delete,'holes');
       citra_thinning_eroding=imerode((bwmorph(citra_fill,'thin',1)),(strel('line',3,90)));
        citra_final=bwareaopen(citra_thinning_eroding,125);
         imshow(citra_final);