how to get coordinates from a value of the coordinates itself?

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Mirza M
Mirza M 2014-5-3
评论： Image Analyst 2014-5-3
hi all, i want to ask something about getting coordinates from the value of something using matlab, soo i have this code :
R = HarrisMeasure(x,y);
R = abs(R);
sortedR = sort(R,'descend');
best = sortedR(1:50,:);
x and y is the inputed coordinates, so how can i get the coordinates after i sorted it? how can i get coordinates of 'best'? thank you
  2 个评论
Mirza M
Mirza M 2014-5-3
all i wanna do here is after i got the coordinates, i want to use
imshow(I); hold on
plot(a,b,'r*')
(a,b) for (x,y) of best, so the output will be a red dot in the best output
Jan
Jan 2014-5-3
Please notice, that we do not know, what your function HarrisMeasure does. So how could we guess, how x,y are correlated to R?

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回答（1 个）

Image Analyst
Image Analyst 2014-5-3
Look at the second return argument from sort(). I think you can use that.
  2 个评论
Mirza M
Mirza M 2014-5-3
im sorry but i dont understand how? i want to get x and y of every sortedR, how to do that? i dont even know how to get x and y from R, how's the code?
Image Analyst
Image Analyst 2014-5-3
Impossible to know, because I don't know what HarrisMeasure does. You need a function that does the inverse of HarrisMeasure(), like
[x, y] = InverseHarrisMeasure(R);
but I imagine there are lots of x,y that could have a particular R value.

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