Ich implementiere lokale Histogrammentzerrung manuell, aber das Ergebnis ist nicht befriedigend Was ich will und was ich bekomme, ist im Bild, ich habe den Code nach gegebenem Ausdruck implementiert, aber die Ergebnisse sind nicht gleich. HierLokale Histogrammentzerrung manuell
ist der Code:
I=rgb2gray(imread('peppers.png'));
if (isa(I,'uint8'))
I=double(I)/255;
end
if (size(I,3)==3)
I=(I(:,:,1)+I(:,:,2)+I(:,:,3))/3; % average the RGB channels
end
windowsize=17;
% Create an empty array
Ieq = zeros(size(I,1),size(I,2));
% Apply this over a NxN region around each pixel (N is odd)
n = floor(windowsize/2); % <-- N is the half size of the region ie. [-N:N,-N:N]
for r=1+n:size(I,1)-n
for c=1+n:size(I,2)-n
% -- INSERT YOUR CODE BELOW ------------------------------------------
% NOTE: For pixels near the boundary, ensure the NxN neighbourhood is still
% inside the image (this means for pixels near the boundary the pixel may
% not be at the centre of the NxN neighbourhood).
if r-n <=1
fromrow=1;
torow=r+n;
else
fromrow=abs(r-n);
if n+r >= size(I,1)
torow=size(I,1);
else
torow=r+n;
end
end
if c-n <= 1
fromcol=1;
tocol=c+n;
else
fromcol=abs(c-n);
if c+n > size(I,2);
tocol=size(I,2);
else
tocol=c+n;
end
end
neighbour = I(fromrow:torow,fromcol:tocol);
lessoreq=neighbour(neighbour<=I(r,c));
sumofval=sum(lessoreq);
pixval=sumofval/(size(neighbour,1)*size(neighbour,2));
Ieq(r,c)=pixval;
% -- INSERT YOUR CODE ABOVE ------------------------------------------
end
end
imshow(Ieq);