Write images from matrices in a cell array? Error?!

Question

Julian 2012-10-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49964-write-images-from-matrices-in-a-cell-array-error

Hi,

I have a cell in which several 320*320*3 matrices a stored. I would like to convert these matrices into images or even more preferably into a movie. I tried imwrite:

>> cleaned_img{1,k}=imwrite(cleaned{1,k},'jpg')

With the error:

Error using imwrite. Too many output arguments.

What am I doing wrong?

Another question:

Is there a way to view the matrices in the 1*360 cell with the imshow command in a way that I can skip from one image to the other without having to type imshow(cleaned{1,1}) to imshow(cleaned{1,360})? I would like to use imshow or another tool just like for example irfanview, just for the image data stored in the matrices.

Thank you!

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Answer 1

Wayne King 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49964-write-images-from-matrices-in-a-cell-array-error#answer_61009

imwrite does not output any arguments. If you want to make a video, why are you needing to use imwrite? See the help for VideoWriter

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Answer 2

Julian 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49964-write-images-from-matrices-in-a-cell-array-error#answer_61023

编辑：Julian 2012-10-5

在 MATLAB Online 中打开

I tried that before. My whole code looks like that.

   jpegFiles = dir('*.jpg');                                   
blank=imread('Tablette_PHAN_596_17 001.jpg');               
white=255*ones(320,320,3);
white_uint8=uint8(white);
negative=white_uint8-blank;                                 
numfiles = length(jpegFiles);
mydata = cell(1, numfiles);
for k = 1:numfiles;
  mydata{1,k} = imread(jpegFiles(k).name); 
  cleaned{1,k}=mydata{1,k}+negative;
  gray_level{1,k}=graythresh(cleaned{1,k});
  binaries{1,k}=im2bw(cleaned{1,k},gray_level{1,k});
end
tab1=VideoWriter('tab1.avi','Archival')
open(tab1)
writeVideo('tab1',cleaned{1,k})
close(tab1)
  end

When I run it I get "Undefined function 'writeVideo' for input arguments of type 'uint8'.

Error in batch_image_cleaning (line 19) writeVideo('tab1',cleaned{1,k})"?!

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Answer 3

Image Analyst 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49964-write-images-from-matrices-in-a-cell-array-error#answer_61029

imwrite does not return ANY value. So you can't do that.

By the way, you didn't give it a filename, unless cleaned{1,k} was the name, in which case you didn't give it a numerical image array. Plus, like Wayne said, imwrite is no way to write videos.

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Answer 4

Julian 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49964-write-images-from-matrices-in-a-cell-array-error#answer_61032

在 MATLAB Online 中打开

Ok, I got that. That's why I posted the code for my try to make a video via VideoWriter in my last post.

tab1=VideoWriter('tab1.avi','Archival')
open(tab1)
writeVideo('tab1',cleaned{1,k})
close(tab1)

With the error

"Undefined function 'writeVideo' for input arguments of type 'uint8'.

I don't have any experiences with MATLAB and studied something not related to image analysis at all. I hope my questions are not too idiotic. I googled and looked up the help but still can't figure out why it doesn't work.