如何在Matlab中保存多个图像？

Question

我从浏览器中选择了多个框架。它在视频隐写术中完美地作为我的项目的封面文件。

将文本嵌入到封面帧（多帧）后，我想将这些帧保存为隐藏图像，但在我的情况下，它只保存最后一张图像。

下面是代码：

[fn, pn,fi] = uigetfile('*.jpg*','Select the Cover Image','Multiselect','on'); 

coln=size(fn); 

numberfile=coln; 

for i=1:numberfile 

    fn(i); 

    entirefile=fullfile(pn,fn{i}); 

    fid=fopen(entirefile); 

    fclose(fid); 
end 

I = imread([pn,fn{i}]); 

pix=I(:); 

J = reshape(pix,size(I)); 

%till here is working fine 

%this code below it problem when I save Stego image it save only last image 

[fn, pn] = uiputfile('*.png', 'Save Stego Image'); 

imwrite(J,[pn,'\',fn],'png'); 

Answer 1

你可以申请在for循环保存操作如下：

[fn, pn,fi] = uigetfile('.jpg','Select the Cover Image','Multiselect','on'); 

coln = size(fn, 2); 

numberfile = coln; 

for i = 1:numberfile 
    fn(i); 

    entirefile = fullfile(pn, fn{i}); 

    fid = fopen(entirefile); 

    fclose(fid); 
end 

for i = 1:numberfile 
    I = imread([pn, fn{i}]); 

    pix = I(:); 

    J = reshape(pix, size(I)); 

    [out_fn, out_pn] = uiputfile('*.png', 'Save Stego Image'); 

    imwrite(J, [out_pn, '\', out_fn], 'png'); 
end 

---

注：
我代替：

[fn, pn] = uiputfile('*.png', 'Save Stego Image');` 

有了：

[out_fn, out_pn] = uiputfile('*.png', 'Save Stego Image'); 

你要保持（未覆盖）fn和pn从阅读阶段。