how to resize an image as per the required dimension
80 次查看(过去 30 天)
显示 更早的评论
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 个评论
Sarah Wait Zaranek
2011-3-16
I =randi(324,512,'uint8');
[m n] = size(I) ;
J = imresize(I, [256 256]);
[x y] = size(J);
This works for me.
采纳的回答
更多回答(3 个)
shyama p
2011-3-17
编辑:Walter Roberson
2017-11-9
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 个评论
dipa teraiya
2018-4-24
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 个评论
salman saleem
2020-10-12
My question is how we can reduce the size of image by taking mean?
1 个评论
Walter Roberson
2023-5-16
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.
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!