mnist数据集转换bmp图片

Mat格式mnist数据集下载地址：http://www.cs.nyu.edu/~roweis/data.html

Matlab转换代码:

load('mnist_all.mat');
type = 'train';
savePath = 'G:\data\mnist\train\';
for num = ::
    numStr = num2str(num);
    tempNumPath = strcat(savePath, numStr);
    mkdir(tempNumPath);
    tempNumPath = strcat(tempNumPath,'\');
    tempName = [type, numStr];
    tempFile = eval(tempName);
    [height, width]  = size(tempFile);
    for r = ::height
        tempImg = reshape(tempFile(r,:),,)';
        tempImgPath = strcat(tempNumPath,num2str(r-));
        tempImgPath = strcat(tempImgPath,'.bmp');
        imwrite(tempImg,tempImgPath);
    end
end