Filter löschen
Filter löschen

I am trying to write a function for the Gamma Correction, this is what I have so far. the problem is the intensities of the output image is either 0 or 255. what am I doing wrong?

2 Ansichten (letzte 30 Tage)
function adjust_im= Gamma_c(im, y, c)
rows = size(im,1);
cols = size(im,2);
mat= zeros(rows,cols,class(im));
for r=1: rows
for co=1: cols
pixel = im(r,co);
p1 = double(pixel/255);
p2 = double(c*((double(p1))^y));
p3 = double(p2*255);
mat(r,co) = round(p3);
end
end
adjust_im= mat;

Akzeptierte Antwort

Adam
Adam am 24 Okt. 2018
Bearbeitet: Adam am 24 Okt. 2018
double(pixel/255)
will divide pixel by 255 then convert to a double. Assuming your image is an 8-bit integer data type this is not what you want as it will use integer division with truncation so everything apart from 255 will become 0. Use
pixel = double( im(r,co) );
or convert the whole image to double before the for loop (probably more efficient) and then you should not need all the other casts to double that you have.

Weitere Antworten (0)

Kategorien

Mehr zu Gamma Functions finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by