Reference to non-existent field 'image'. Error in Untitled2 (line 10) a80 = double(x1_image.image); -----Need help

Question

Aris John 2020-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/525305-reference-to-non-existent-field-image-error-in-untitled2-line-10-a80-double-x1_image-image

回答： Aris John 2020-5-26

A =imread('0001BG.tiff')
save('80s', 'A')
[x_file, x_folder] = uigetfile('*.mat', 'Select 80s-file');
x1_image = load([x_folder,x_file]);
cd(x_folder);
a80 = zeros(1024);
a80 = double(x1_image.image);

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Aris John 2020-5-13

I want to convert a .tiff file to a .mat file 80s, then load it into an empty array a80. The a80 initially created by zeros(1024). While executing the last line it shows an error as follows.

Error in Untitled2 (line 10)

a80 = double(x1_image.image);

I am new to matlab, please help.

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Answer 1

Geoff Hayes 2020-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/525305-reference-to-non-existent-field-image-error-in-untitled2-line-10-a80-double-x1_image-image#answer_432368

编辑：Geoff Hayes 2020-5-14

在 MATLAB Online 中打开

Aris - what make you think that image is a valid field for x1_image? In your example, you save the A variable to the 80s.mat file and so when you load this file as

x1_image = load([x_folder,x_file]);

then the field for x1_image will be A. Your code would then be

A =imread('0001BG.tiff')
save('80s', 'A')
[x_file, x_folder] = uigetfile('*.mat', 'Select 80s-file');
x1_image = load([x_folder,x_file]);
cd(x_folder);
a80 = zeros(1024);
a80 = double(x1_image.A);

The above code is only valid if A is the variable that is always saved to the 80s.mat files. You could use fieldnames to get the list of fields of x1_image and your code might become

A =imread('0001BG.tiff')
save('80s', 'A')
[x_file, x_folder] = uigetfile('*.mat', 'Select 80s-file');
x1_image = load([x_folder,x_file]);
structFieldnames = fieldnames(x1_image);
if ~isempty(structFieldnames)
    cd(x_folder);
    a80 = zeros(1024);
    a80 = double(getfield(x1_image, structFieldnames{1}));
end

Here I'm assuming that the first fieldname corresponds to the image of interest...

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Walter Roberson 2020-5-14

在 MATLAB Online 中打开

[x_file, x_folder] = uigetfile('*.mat', 'Select 80s-file');
if ~ischar(x_file); return; end    %user cancel
x1_image = load( fullfile(x_folder, x_file) );

uigetfile does not promise that the returned folder will end in a path separator character, and it does not promise to be consistent about that either. A couple of weeks ago, someone on a Windows system was having trouble and it turned out that uigetfile was not putting in the path seperator. Using fullfile() makes it unecessary to think about whether the separator is there are not.

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