How can I save a image from imshow into a cell array ?

Hi ,I used (dd = [128 48] ;) doubles array to do mat2gray() , then doing the imshow to save image in a cell array (like dat{i,1}=imshow(mat2gray(dd));)

But when the image update , those data can't save at the cell array.

i wanna save these data in cell arrat that me can simply take data to training my CNN .and i have no idea.

Have anyone can save me ,plz

[Stephen Cobeldick]

"...then doing the imshow to save image in a cell array ... dat{i,1}=imshow(...)"

As the imshow documentation clearly states, its output is not an image, it is a handle to an image object:

https://www.mathworks.com/help/matlab/creating_plots/the-image-object-and-its-properties.html

https://www.mathworks.com/help/matlab/ref/matlab.graphics.primitive.image-properties.html

If you do not know what graphics objects are, then read this and its child pages:

https://www.mathworks.com/help/matlab/graphics-objects.html

Rather than storing the handles in a cell array, I strongly recommend that graphics object handles be stored in a graphics object array:

https://www.mathworks.com/help/matlab/creating_plots/concatenating-handles-into-arrays.html

which you can preallocate using https://www.mathworks.com/help/matlab/ref/gobjects.html

If you really want to store the image data (i.e. the objects' CData), then use a cell array.

[Lee Willy]

Sincerely appreciate your answer , i will try graphics object array to do my object. Thank you!!

Answer 1

[Ridwan Alam]

I don't think you need the imshow(). imshow() is only used to show the image, and it returns an image object, which is not normally used in CNN training..

dat{i,1} = mat2gray(dd);

should store the grayscale image dd to dat cell array. If you want to show it later, just use imshow(dat{i,1}).

[Stephen Cobeldick]

"imshow() ... returns a figure handle"

imshow does not return a handle to a figure object. It returns a handle to an image object.

[Lee Willy]

Sincerely appreciate your answer .

i don't know why my imageinput can't use gray data.

just wanna try this method if it can work.

so now i let data saveas picture to do my object.

hope it can work.

Answer 2

[Image Analyst]

I don't know why you're trying to store anything in a cell array. If you have tons of training images, you may not even have enough memory. Why not use the way that the Mathworks recommends, which is to use an imageDatastore object?