how to resize an image as per the required dimension
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ramya s
el 16 de Mzo. de 2011
Comentada: Walter Roberson
el 16 de Mayo de 2023
i am doing my final yr project on steganography. and my project s suit only for square matrix images. (i.e, 256*256 512*512 1024*1024) like that images. i need images for that. wen i tried to resize other images it does not works.
for eg., I=imread('post.jpg');
[m n] = size(I)
J = imresize(I, [256 256]);
[x y] = size(J)
the output i m getting is m = 324 n = 512
x = 256 y = 1156
i do not know why it is like this. i am not getting any errors. help me what to do what shall i do now? please help me its very urgent
2 comentarios
Sarah Wait Zaranek
el 16 de Mzo. de 2011
I =randi(324,512,'uint8');
[m n] = size(I) ;
J = imresize(I, [256 256]);
[x y] = size(J);
This works for me.
Respuesta aceptada
Walter Roberson
el 16 de Mzo. de 2011
Your image is 3 dimensional (RGB), not 2 dimensional.
0 comentarios
Más respuestas (3)
shyama p
el 17 de Mzo. de 2011
Editada: Walter Roberson
el 9 de Nov. de 2017
I1=imread('post.jpg');
I2 = imresize(I1,[256 256]);
In=rgb2gray(I2); % use if the image containing RGB value 3
figure;imshow(In);
imwrite(In,'yi.jpg') ;
3 comentarios
dipa teraiya
el 24 de Abr. de 2018
hello friends i have image of dimension is 84 * 34 and size of image is 16.1 KB Now other image of dimension is same but size of image is different is 16.4 KB so pls tell me which code can be applied when increase the size of image?
0 comentarios
salman saleem
el 12 de Oct. de 2020
My question is how we can reduce the size of image by taking mean?
1 comentario
Walter Roberson
el 16 de Mayo de 2023
Suppose that you replace each N x N block of pixels with the mean value of the pixels in that block. Then your image with be 1/N times as large, but still similar.
For example:
img = imread('flamingos.jpg');
imgd = im2double(img);
img2x2 = (imgd(1:2:end,1:2:end,:) + imgd(1:2:end,2:2:end,:) + imgd(2:2:end,1:2:end,:) + imgd(2:2:end,2:2:end,:))./(2*2);
imshow(imgd); title('original');
imshow(img2x2); title('mean of 2x2 blocks')
whos img img2x2
You can see that the two images are visually very very similar, but the second image is only half the number of rows and columns of the first image.
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