How do I solve this error "Index exceeds matrix dimensions."

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Chidiebere Ike 2018-10-20

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关闭： MATLAB Answer Bot 2021-8-20

Hello,

I am having issues with a code I got via this link https://www.mathworks.com/matlabcentral/fileexchange/38200-fast-non-local-mean-image-denoising-implementation.

Corrections where made on the codes via the comments but I still have errors when I made the suggested corrections and applied the code in my proposed algorithm. The error reads below:

Index exceeds matrix dimensions.
Error in FAST_NLM_II (line 54)
          SqDist =
          Sd(PatchSizeHalf+WindowSizeHalf+1:Height+WindowSizeHalf+PatchSizeHalf,PatchSizeHalf+WindowSizeHalf+1:Width+WindowSizeHalf+PatchSizeHalf)...
          % lower right corner

I will appreciate contributions.

Thank you

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Answer 1

Image Analyst 2018-10-20

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Break it down into smaller parts

whos Sd
[rows, columns] = size(Sd)
index1 = PatchSizeHalf+WindowSizeHalf+1
index2 = Height+WindowSizeHalf+PatchSizeHalf
index3 = PatchSizeHalf+WindowSizeHalf+1
index4 = Width+WindowSizeHalf+PatchSizeHalf

Now, is index2 bigger than rows, or index4 bigger than columns?

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Chidiebere Ike 2018-10-20

编辑：Image Analyst 2018-10-20

在 MATLAB Online 中打开

FAST_NLM_II.m

Thanks for your response. NO, index2 is not bigger than rows, or index4 is not bigger than columns as seen below. To obtain the below information, I replaced breakdown in Line 56 on the original code attached.

whos Sd
[rows, columns] = size(Sd)
index1 = PatchSizeHalf+WindowSizeHalf+1
index2 = Height+WindowSizeHalf+PatchSizeHalf
index3 = PatchSizeHalf+WindowSizeHalf+1
index4 = Width+WindowSizeHalf+PatchSizeHalf)
Name        Size               Bytes  Class     Attributes
    Sd        522x522            2179872  double 
  rows =
     522
  columns =
     522
index1 =
     7
index2 =
   518
index3 =
     7
index4 =
   518

Here is an error obtained. I have attached the original code

Undefined function or variable 'SqDist'.
Error in FAST_NLM_II (line 64)
        w = exp(-SqDist/(2*Sigma^2));

Thanks

Image Analyst 2018-10-20

Then I have no idea why it says an index is out of bounds. You'll have to dig further.

What arguments did you pass in to the function?

It's saying SqDist is an unknown function because line 54 did not execute and define it. I'm not sure how it made it down to line 64 unless line 54 was in an if block that didn't execute. This link should help with that http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

How do I solve this error "Index exceeds matrix dimensions."

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