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

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Julian
Julian 2012-10-5
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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回答（4 个）

Wayne King
Wayne King 2012-10-5
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
Julian
Julian 2012-10-5
编辑：Julian 2012-10-5
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})"?!
Image Analyst
Image Analyst 2012-10-5
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.
Julian
Julian 2012-10-5
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.

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