.mat ouput giving error
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i am trying to look at the ouput of .mat file so i loaded the ,mat in current folder
a = load('GT_IMG_1.mat');
imshow(a)
but i am getting the following error, can some one help me with this
Error using imageDisplayValidateParams
Expected input number 1, I, to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64, logical
Instead its type was struct
Error in images.internal.imageDisplayParseInputs (line 78)
common_args = images.internal.imageDisplayValidateParams(common_args);
Error in imshow (line 222)
images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});
采纳的回答
Ameer Hamza
2020-4-17
编辑：Ameer Hamza
2020-4-17
load() function returns a struct: https://www.mathworks.com/help/matlab/ref/load.html. The struct has field names, the same as the variable names inside the .mat file. You can see the name of fields
a = load('GT_IMG_1.mat');
fieldnames(a)
and then use imshow on the field containing the image data
imshow(a.ImageVariableName) % ImageVariableName is the name of the field inside a
13 个评论
sri harsha
2020-4-17
编辑：sri harsha
2020-4-17
Ameer Hamza
2020-4-17
Can you attach the .mat file "GT_IMG_1.mat"?
sri harsha
2020-4-17
sri harsha
2020-4-17
sri harsha
2020-4-17
Ameer Hamza
2020-4-17
sri harsha, Your .mat file does not contain any image. It just contain a cell array which also does not contain any image.
sri harsha
2020-4-18
Ameer Hamza
2020-4-18
An image file is a matrix of size m*n, where m and n are the height and width of the image in pixels. Even a typical low-resolution image usually has m>200, and n>200. The cell array in your .mat file has a matrix of size mx2. If you make it as an image, it will just be two pixels wide. It will not be observable.
sri harsha
2020-4-18
编辑：sri harsha
2020-4-18
ya i waht you said is true,imagine if those pixels value(represent) the heads of people,, all in the image ,can i consider (mx2) it to be the pixel values of head,beacuse i am working on crowd counting based on head detection ad it is its dataset
Ameer Hamza
2020-4-18
Yes, that is also possible, but you still cannot call imshow() function on that information. imshow() need information about all the pixels in the image.
sri harsha
2020-4-18
sri harsha
2020-4-18
Ameer Hamza
2020-4-18
You can get the location of the heads in pixel coordinates using this
a = load('GT_IMG_1.mat');
locations = a.image_info{1}.location;
You can first load the image you attached in the comment above and the use the plot the locations in mat file like this
im = imread('imge_filename'); % your image file.
imshow(im);
hold on
a = load('GT_IMG_1.mat');
locations = a.image_info{1}.location;
plot(locations(:,1), locations(:,2), '+')
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