License Plate Detection & Segmentation

Description

License-Plate-Detection

step 1 Convert the image into gray color and take DWT transform of gray colored image

step 2 Use sobel edge detcetion of vertical component of DWT transformed image

step 3 apply imclose, imopen morphological operations with strcutural co-efficient like

se=strel('rectangle',[20,30]);
eroded=imdilate(edgy,se);
eroded=imclose(edgy,se);
se=strel('disk',10);
eroded=imopen(eroded,se);

step 4 Use bounding box method to extract all possible bounding boxes and below condition to select the bounding box of license plate only

dim(jj)=BB(jj).BoundingBox(3)/BB(jj).BoundingBox(4);
if dim(jj)>4
--
end

BoundingBox(3)= height BoundingBox(4)= width

step5 crop the detected license plate and apply morphological operations again to extract the characters in license plate.

Step 5.1 Enhance the image edges by gradient enhancement operation

g=rgb2gray(cropedimg);              % Converting the RGB (color) image to gray (intensity).
g=medfilt2(g,[3 3]);                % Median filtering to remove noise.
se=strel('disk',1);                 % Structural element (disk of radius 1) for morphological processing.
gi=imdilate(g,se);                  % Dilating the gray image with the structural element.
ge=imerode(g,se);                   % Eroding the gray image with structural element.
gdiff=imsubtract(gi,ge);            % Morphological Gradient for edges enhancement.

Step 5.2 Eliminate the license plate edges and removing pixels area with more than 100 pixels results in segmented characters.

abhishek gupta

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