Azzera filtri
Azzera filtri

Vectorization, check if points coordinate is exist in an image or no

2 visualizzazioni (ultimi 30 giorni)
Can anyone help me to vectorize this for loop. It is basically ckecking if the x and y coordinate of is one in N matrix or not. Thank you
for i = 1:length(coordinates)
DD = coordinates(i,:);
DDD = N(DD(1),DD(2));
if DDD ==1
%%%if the dicom point is inside the mask
signVector(i) = -1;
%%%if the dicom point is outside the mask
signVector(i) = +1;

Risposta accettata

Teja Muppirala
Teja Muppirala il 10 Ott 2017
signVector = ones(size(coordinates,1),1);
inds = sub2ind(size(N),coordinates(:,1),coordinates(:,2)); % Convert to linear indices
signVector( N(inds)==1 ) = -1;

Più risposte (2)

Andrei Bobrov
Andrei Bobrov il 9 Ott 2017
Modificato: Andrei Bobrov il 9 Ott 2017
ii = coordinates;
d3 = N(ii(:,1),ii(:,2));
signVector = -ones(numel(d3),1);
signVector(d3 ~= 1) = 1;
  2 Commenti
Mahsa il 9 Ott 2017
Thank you. but it did not work d3 should be a vector not a matrix
Image Analyst
Image Analyst il 10 Ott 2017
Give us code, or a .mat file, to generate coordinates so we can see what you're seeing.

Accedi per commentare.

Image Analyst
Image Analyst il 9 Ott 2017
Be careful. If coordinates is an array of (x,y) and N is an array, then you'll need to check N(y, x), not N(x,y) as you have perhaps done. Remember (row, column) is (y, x) NOT (x,y).

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