Question

我有这个代码将图像转换为灰色并将其保存在当前文件夹中：

directory = dir('AM01AFS.jpg');
for i = 1 : size(directory,1)
   filename = directory(i).name;
   img = rgb2gray(imread(filename));
   imwrite(img, ['Gr_' filename]);
end

我需要将文件夹（图像）从RGB转换为灰色，并将它们保存在Output文件夹中，并使用相同的原始名称。

Answer 1

您的代码看起来很好我希望你需要将RGB转换为Gary，而不是将GRB转换为Gary ......

将directory = dir('AM01AFS.jpg');修改为directory = dir('*.jpg');

如果您不想覆盖现有图片，请创建新的输出目录。

%Assume jpg images are in the same directory as the m file.
indir = cd; %Modify the indir to location of the jpg files.
outdir = 'Gray'; %Name or output directory.
directory = dir([indir, '\', '*.jpg']);

if ((~exist(outdir, 'dir') && length(directory) > 0))
    %Create new directory named outdir if directory not exist.
    mkdir(outdir);
end

for i = 1 : length(directory)
    filename = directory(i).name;
    rgb_img = imread([indir, '\', filename]);    
    if (ndims(rgb_img) == 3) %Make sure img is RGB (not gray).
        img = rgb2gray(rgb_img);
        %Save gray image to outdir (keep original name).
        imwrite(img, [outdir, '\', filename]);
    end
end

如果要打开文件夹选择对话框，可以使用以下示例：

%Open folder selection dialog box, for selecting input and output folders.
indir = uigetdir(cd, 'Select input folder');
outdir = uigetdir(cd, 'Select output folder');
directory = dir([indir, '\', '*.jpg']);

for i = 1 : length(directory)
    filename = directory(i).name;
    rgb_img = imread([indir, '\', filename]);    
    if (ndims(rgb_img) == 3) %Make sure img is RGB (not gray).
        img = rgb2gray(rgb_img);
        %Save gray image to outdir (keep original name).
        imwrite(img, [outdir, '\', filename]);
    end
end

RGB到灰色转换文件夹中的所有图像，将它们保存到具有原始名称的其他文件夹

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