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calculating euclidean distance

Asked by FIR on 17 Feb 2012
Latest activity Edited by Mei on 15 Oct 2013

I have a dataset of images(175images),i have found the mean of that and have saved,next i have query image from dataset,now i want to calculate euclidean distance and want to retrieve that image,

i did

for n=1:175; Distance=EuD( Features{1,n},FeaturesQuery); D{n}=Distance;

end

i get error as

Cell contents assignment to a non-cell array object.

Error in ==> MAIN at 116 D{n}=Distance; please help

Features=<1x175 cell>

FeaturesQuery=104.8872

please help

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FIR

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2 Answers

Answer by Tom Lane on 17 Feb 2012

It is likely that you have assigned D to some value, perhaps a plain numeric value, earlier in the function. So it is not a cell array, and you can't assign into it using cell array notation. Just before you start the loop in which you want to assign into cells of D, try inserting either of the following lines:

clear D
D = cell(1,175);

0 Comments

Tom Lane
Answer by Image Analyst on 17 Feb 2012

I just did this:

for n=1:175
	Distance=10; %EuD( Features{1,n},FeaturesQuery); 
	D{n}=Distance;
end

and it ran fine. I didn't even preallocate D to be a cell array of length 175. No errors or warnings whatsoever. Now, we don't know what EuD returns but I thought you could toss anything you wanted into a cell so I'm not sure why the "D{n}=Distance" line would complain, regardless of what class type Distance was. Let me ask you, what class type and/or value does Distance have?

6 Comments

FIR on 17 Feb 2012

I ran i get same error

Cell contents assignment to a non-cell array object.

i am using r2010a

Image Analyst on 17 Feb 2012

I don't think you did run my code, or you would not have gotten the error. I think Tom Lane has hit the nail on the head. Just change 75 to 175 in his code and try it.

FIR on 18 Feb 2012

Yesterday ur code did not work,but now its working,may be i have not used clear D ,i have extracted features of 40 images and stored,and gave a taken query image ,and have extracted same features,now i want to compare those and if it is from same dataset ,the retrieved image and query image must be displaed,if it not from same dataset ,"Image not found "

Image Analyst

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