Interpolation problem with interp2

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D. 2011-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/8342-interpolation-problem-with-interp2

评论： Walter Roberson 2016-10-13

Hi everyone!

I did some computations on a grayscale picture and I would like to interpolate some points in my matrix. My problem is that interp2 doesn't allow to do what I want to.

Let's say my matrix is im

im = [1 2 3; 4 nan 6; 7 8 9];

and when I do:

[colum row] = meshgrid(1:3,1:3);
colum_i = 2;
row_i = 2;
zi = interp2(colum, row, im, colum_i, row_i);

I would like that it interpoles the nan. Is there a way to redefine a point in the matrix instead of a point between the points of the matrix?

My picture is a 512x512 pixels and interp2 would be very useful and fast instead of computing for every point separately...

Thank you for yours answers.

Regards, D.

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Answer 1

Walter Roberson 2011-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/8342-interpolation-problem-with-interp2#answer_11504

I suggest you consider John d'Errico's MATLAB File Exchange contribution inpaint_nans

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Jan 2011-5-27

Walter, you are typing faster than me - yesterday, today and tomorrow. It would increase the efficiency of my work, if a small icon appears in the question to show, that you are reading it currently - and will have answered it some seconds later.

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