why is my difference image black?...

Question

Matthew Worker 2021-10-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1467816-why-is-my-difference-image-black

编辑： Rena Berman 2021-12-13

the program works but my difference image is just black...did i do something wrong? or is there a way to make it visible?

%% 3. Interpolation
ori=imread('body.jpg');                                     %a)Read‘body.jpg’;store into‘ori’ 
sma=imresize(ori,[32 32]);                                  %b)Resize‘ori’ to 32x32;store into‘sma’
nea=imresize(ori,1,'nearest');                              %c)Resize‘sma’ to original using nearest interpolation;store into‘nea’
bil=imresize(ori,1,'bilinear');                             %d)Resize‘sma’ to original using bilinear interpolation;store result into‘bil’
bic=imresize(ori,1,'bicubic');                              %e)Resize‘sma’to original using bicubic interpolation;store result into‘bic’
figure                                                      %f)Display‘ori’,‘nea’,‘bil’,'bic' same figure
subplot(4,1,1);
imshow(ori)
title('ori');
subplot(4,1,2);
imshow(nea)
title('nea');
subplot(4,1,3);
imshow(bil)
title('bil');
subplot(4,1,4);
imshow(bic)
title('bic');
df=imabsdiff(bil,bic);
figure                                                      %g)Display the difference image between bil and bic 
imshow(df,[])
title('difference image');

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Rik 2021-12-1

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why is my difference image black?...

the program works but my difference image is just black...did i do something wrong? or is there a way to make it visible?

%% 3. Interpolation
ori=imread('body.jpg');                                     %a)Read‘body.jpg’;store into‘ori’ 
sma=imresize(ori,[32 32]);                                  %b)Resize‘ori’ to 32x32;store into‘sma’
nea=imresize(ori,1,'nearest');                              %c)Resize‘sma’ to original using nearest interpolation;store into‘nea’
bil=imresize(ori,1,'bilinear');                             %d)Resize‘sma’ to original using bilinear interpolation;store result into‘bil’
bic=imresize(ori,1,'bicubic');                              %e)Resize‘sma’to original using bicubic interpolation;store result into‘bic’
figure                                                      %f)Display‘ori’,‘nea’,‘bil’,'bic' same figure
subplot(4,1,1);
imshow(ori)
title('ori');
subplot(4,1,2);
imshow(nea)
title('nea');
subplot(4,1,3);
imshow(bil)
title('bil');
subplot(4,1,4);
imshow(bic)
title('bic');
df=imabsdiff(bil,bic);
figure                                                      %g)Display the difference image between bil and bic 
imshow(df,[])
title('difference image');