如何使用 MATLAB 加载 .mat 图像文件答案

【问题标题】：How to load .mat images file using MATLAB如何使用 MATLAB 加载 .mat 图像文件
【发布时间】：2021-11-04 02:55:17
【问题描述】：

您好，我是 MATLAB 新手，我一直在尝试弄清楚如何使用 MATLAB 加载 faces1000.mat 文件和 nonfaces1000.mat 图像，我有一个 load_mnist 代码

mnist_file = 'scrambled_mnist10000.bin';
fid = fopen(mnist_file, 'r');

[number, count] = fread(fid, 1, 'int32');
if count ~= 1
     disp('failed to read number');
end

[mnist_permutation, count] = fread(fid, number, 'int32');
if count ~= mnist_permutation
     disp('failed to read number');
end


 [mnist_labels, count] = fread(fid, number, 'uchar');
if count ~= number
    disp('failed to read number');
end

mnist_digits = fread(fid, [28, 28 * number], 'uchar');
mnist_digits = reshape(mnist_digits, [28, 28, number]);

fclose(fid);
disp('loaded mnist digits');

我只是不确定是否应该以相同的方式加载我的 faces1000.mat 和 nonfaces1000.mat 图像文件。我会很感激任何帮助，谢谢。

【问题讨论】：

标签： matlab

【解决方案1】：

您可以通过这种方式加载 .mat 文件

% Load entire mat file contents into a structure.
% The structure has a member "I" that is a double 512x512 array.
storedStructure = load('Data.mat');
% Extract out the image from the structure into its own variable.
% Don't use I as the variable name - bad for several reasons.
imageArray = storedStructure.s.I;  % Or storedStructure.I depending on what members your structure has.
% Display the image in a brand new figure window.
figure(1);
% Display double image, scaled appropriately.
% No need to cast to uint8 - could even be bad
% if your double numbers don't span the 0-255 range nicely.
imshow(imageArray, []);

这是基于 MATLAB 论坛上的帖子。

Load an image from .mat

【讨论】：