How to read image matrix stored in a structure

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HJ Akhtar
HJ Akhtar 2018-7-12
评论： HJ Akhtar 2018-7-12
I have a letters.mat file which has one variable dataset which is a struct and dataset has 2 more fields as train , test which both are also structures, In train structures 2 fields are images and labels ...images is of 124800*784 unit8 type... I want to read those images and store them in a folder. How can I do that? I used the code load('dataset.mat') train = dataset.train images = train.images; Now when I show the image using imshow() it displays error that Error using imread>parse_inputs (line 450) The file name or URL argument must be a character vector.
Error in imread (line 322) [filename, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});
Error in ex (line 46) imgArray = imread(images)
Can anyone help me with the code? Thanks in advance
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KSSV
KSSV 2018-7-12
YOu have the data already in hand...you cannot use imread.
HJ Akhtar
HJ Akhtar 2018-7-12
No, I am not sure... Actually i dont know how to access images from dataset.train.images which is of type uint8 and size 124800*784 #KSSV

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Guillaume
Guillaume 2018-7-12
编辑：Guillaume 2018-7-12
If you want to see the image, it's simply:
imshow(dataset.train.images);
The image is a grayscale image. However, it is puzzling why the field is called images since it contains just one (very big image).
If you want to save the image to disk in its own file:
imwrite(dataset.train.images, 'C:\somewhere\somename.png');
edit: Again, your training dataset contains just one image. However, since it's so big, it's possible that that single image is the result of stitching together several images.

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