How to store number of images matrix and double values in cell or array?
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I am not to familiar with arrays or cells in MATLAB. I would like to make an array that contains in one cell for image 1, image 2, image 3 etc the following per image;
Image Matrix (Pixel value (n x m size) matrix of image) - M
string value - imageType
double value - pos
double value - exposure
How do I do this?
It should be mentioned I will use the values above (matrix and the values) for calculations like sum and so forth etc.
Also, how do I sort them in decreasing order of pos value so that the others also are sorted accordingly?
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David Young
2014-9-16
Cell arrays could be used, but this looks like an ideal case for a struct array. See this introduction. You might do something like this:
for imageNumber = 1:numberOfImages
<read in or compute the current image and its associated data to the variables
M, imageType, pos and exposure>
imageStruct(imageNumber).imageMatrix = M;
imageStruct(imageNumber).imageType = imageType;
imageStruct(imageNumber).pos = pos;
imageStruct(imageNumber).exposure = exposure;
end
Then to sort, something like this:
[~, sortedIndices] = sort([imageStruct.pos], 2, 'descend');
imageStruct = imageStruct(sortedIndices);
which will keep each image with its associated data in the sorted array.
1 个评论
Image Analyst
2014-9-16
编辑：Image Analyst
2014-9-16
I agree that a struct array is better and much simpler to understand. That said, the FAQ has a good discussion of cell arrays that should help you get a good intuitive feeling for them http://matlab.wikia.com/wiki/FAQ#Can_you_program_up_the_algorithm_in_this_article_for_me_and_explain_it_to_me.3F>, but again, I recommend David's approach.
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