How do I display 55x305x4 .mat file as an image in Matlab and save it ?

welcome All Matlab users, I have an depth image in .mat file the image 4 channel 55*305*4 ... I have a problem with display it and save it in External file.please,could you help me.

[sloppydisk]

Please post the file so we can help you.

[saddam abdulwahab]

ok,this is the file

[sloppydisk]

What do the 4 channels represent exactly? I see there's also negative values, what type of file would you like to export to?

[saddam abdulwahab]

4 channels the type of image depth I think the 3 channel the image and the channel number 4 the depth image, I need convert the file.mat into depth image (jpg,JPEG,png).

[sloppydisk]

You must really specify what the input channels represent otherwise there is no meaningful way of converting the file and we will just be guessing at what you want.

[Saddam Abdulwahab]

I have this file s.mat I need save it as depth image like this image depth.png

Answer 1

[Anton Semechko]

% Data array
A=Position3DGrid;

% Convert to uint8
I_min=min(A(:));
I_max=max(A(:));
A=uint8(255*(A-I_min)/(I_max-I_min));

% Composite image
n=2; % number of pixels added to when making a boundary between channels; to separate them visually
IM=cell(4,1);
for i=1:4
    im=repmat(A(:,:,i),[1 1 3]);
    if i<4 % boundary
        im=padarray(im,[n 0 0],255,'post');
    end
    IM{i}=im;
end
IM=cell2mat(IM);
IM=padarray(IM,[n n 0],255);

% Save composite image to current directory 
imwrite(IM,'composite image.jpg')

% This is what the composite image looks like
figure, imshow(IM)