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Character Recognition Example (III):Training a Simple NN for classification

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Character Recognition Example (III):Training a Simple NN for classification

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07 Oct 2005 (Updated )

This demo shows some examples for image pre-processing before the recognition stage.

edu_imgcrop(bw)
function bw2 = edu_imgcrop(bw)

% Find the boundary of the image
[y2temp x2temp] = size(bw);
x1=1;
y1=1;
x2=x2temp;
y2=y2temp;

% Finding left side blank spaces
cntB=1;
while (sum(bw(:,cntB))==y2temp)
    x1=x1+1;
    cntB=cntB+1;
end

% Finding right side blank spaces
cntB=1;
while (sum(bw(cntB,:))==x2temp)
    y1=y1+1;
    cntB=cntB+1;
end

% Finding upper side blank spaces
cntB=x2temp;
while (sum(bw(:,cntB))==y2temp)
    x2=x2-1;
    cntB=cntB-1;
end

% Finding lower side blank spaces
cntB=y2temp;
while (sum(bw(cntB,:))==x2temp)
    y2=y2-1;
    cntB=cntB-1;
end

% Crop the image to the edge
bw2=imcrop(bw,[x1,y1,(x2-x1),(y2-y1)]); 

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