Array indices must be positive integers or logical values.
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sigma = 1.0;
Red=double(Red);
NIR=double(NIR);
knr = exp(-(NIR-Red) ^2/(2*sigma ^2));
kNdvi = (1-knr)/(1+knr);
figure,imshow(kNdvi,[]);
colormap(summer);
colorbar;
Error in kNDVI (line 10)
knr = exp(-(NIR-Red) ^2/(2*sigma ^2));
采纳的回答
Image Analyst
2021-8-10
Try
Since NIR and Red are images, not scalar, try
knr = exp(-(NIR-Red) .^ 2 / (2*sigma ^2));
Note that I'm using .^ instead of ^.
更多回答（2 个）
the cyclist
2021-8-9
编辑：the cyclist
2021-8-9
0 个投票
Is it possible that you defined a variable called exp? If so, then MATLAB is trying to index into that variable, rather than calling the function. (Never name a variable the same as a MATLAB function.)
If that does not solve your problem, it would be helpful if you uploaded a MAT file and full code required to replicate the error. Otherwise, there is too much guesswork for us.
3 个评论
Simba
2021-8-9
the cyclist
2021-8-10
I won't be able to run your code locally, because I do not have the Image Processing Toolbox. But right now no one can run your code, because we don't have those input files. (It's difficult to tell if the inputs are important.)
Simba
2021-8-11
Image Analyst
2021-8-10
0 个投票
See the FAQ for a thorough discussion and explanation of the error:
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