how to save/write images using for loop?

2014 2 10
3 个回答
回答已采纳
更新时间：2022 5 16
4 次查看（30 天）

1 个投票

for i=1:10
imwrite(x,'i.jpg') % x be a image to write
end;
how to vary i that different images can be saved?

请先登录，再回答此问题。

 采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-2-10
编辑：Azzi Abdelmalek 2014-2-10

12 个投票

for i=1:10
imwrite(x,sprintf('%d.jpg',i))
end;

更多回答（2 个）

Mischa Kim
Mischa Kim 2014-2-10
编辑：Mischa Kim 2014-2-10

5 个投票

Azizullah, the code snippet below shows you how to save an (or several) images using a loop.
N = 4;
A = imread('my_img.png');
for ii = 1:N
imwrite(A,strcat('my_new',num2str(ii),'.png'));
end
The strcat command creates (oncatenates) a new string for each image containing a number (as a possible image identifier).

3 个评论
显示 1更早的评论 隐藏 1更早的评论

azizullah khan
azizullah khan 2014-2-10
thanks bro......................
Kamran shahani
Kamran shahani 2016-11-20
编辑：Image Analyst 2016-11-20
bro and how I read and write multiple images I have code when i select two pictures, it give me error :
Error in imread (line 316)
[filename, fmt_s, extraArgs] = parse_inputs(varargin{:});
%improve underwater image
tic;
[filename, pathname, filterindex] = uigetfile( ...
{
'*.*', 'All Files (*.*)'}, ...
'Pick a file', ...
'MultiSelect', 'on');
if isequal(filename,0)
disp('User selected Cancel')
else
disp(['User selected', fullfile(pathname, filename)])
end
Il=imread(filename);
% imshow(Il), title('original');
RGB=Il;
cform2lab=makecform('srgb2lab');
LAB= applycform(RGB, cform2lab);
%image onvert in to L*A*B color space
L=LAB(:,:,1);
LAB(:,:,1)=adapthisteq(L,'cliplimit', 0.02, 'Distribution', 'rayleigh');
cform2srgb=makecform('lab2srgb');
% convert back to RGB
A=applycform(LAB, cform2srgb);
t=toc,
imwrite(A,strcat('a','.jpg'))
subplot(2,2,1), imshow(RGB), title('BEFOR CLAHE');
subplot(2,2,2), imshow(A), title('AFETR CLAHE');
Image Analyst
Image Analyst 2016-11-20
That's because you constructed the full filename when you used disp() but forgot to use it when you called imread. Also, multiselect needs to be off, not on since imread() can't open multiple files at once. To fix:
% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = 'C:\Program Files\MATLAB';
if ~exist(startingFolder, 'dir')
% If that folder doesn't exist, just start in the current folder.
startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
% User clicked the Cancel button.
fprintf('You clicked the Cancel button.\n');
return;
end
fullFileName = fullfile(folder, baseFileName)
fprintf('You chose file %s.\n', fullFileName);
% Read in the file.
Il = imread(fullFileName);

请先登录，再进行评论。

Image Analyst
Image Analyst 2014-2-10

0 个投票

6 个评论
显示 4更早的评论 隐藏 4更早的评论

Muhammad Hammad Malik
编辑：Walter Roberson 2018-9-10
i am using this code
N = 4; A = imread('my_img.png'); for ii = 1:N imwrite(A,strcat('my_new',num2str(ii),'.png'));
but when i run this code it is saving multiple images but when again i run this, it overwrite the images on previous ones instead creating the new images. so how to do that? thanks
Image Analyst
Image Analyst 2018-8-20
Try this:
N = 4;
% A = imread('my_img.png');
A = imread('cameraman.tif');
titleBarCaption = 'Overwrite?';
for ii = 1 : N
baseFileName = sprintf('my_new%d.png', ii);
fullFileName = fullfile(pwd, baseFileName);
if exist(fullFileName, 'file')
promptMessage = sprintf('%s exists already.\nDo you want to overwrite %s?', baseFileName);
buttonText = questdlg(promptMessage, titleBarCaption, 'Yes', 'No', 'Yes');
if strcmpi(buttonText, 'Yes')
imwrite(A, fullFileName);
fprintf('Wrote %s\n', fullFileName);
else
fprintf('Skipped %s\n', fullFileName);
end
else
imwrite(A, fullFileName);
fprintf('Wrote %s\n', fullFileName);
end
% recycle on;
% delete(fullFileName);
end
Muhammad Hammad Malik
编辑：Muhammad Hammad Malik 2018-8-27
thanks. i tried but getting error.i want to know that what is 'fullFileName' here? and i want to capture images at different time but each time new captured image replaced with old image, i want to keep all images
Image Analyst
Image Analyst 2018-8-27
fullFileName is what you did like this:
strcat('my_new',num2str(ii),'.png')
but with the folder prepended.
Muhammad Hammad Malik
编辑：Walter Roberson 2018-9-10
i tried your code but still getting error
Image Analyst
Image Analyst 2018-9-10
Uh, okay.... So think about what you might be able to do, if you were in our shoes, to help us to help you.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Deep Learning Toolbox 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by