Create Small Neighborhood of image
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Yohanes Setiawan
2020년 2월 3일
댓글: Vinai Datta Thatiparthi
2020년 2월 21일
I want to make small neighborhood of every pixel x. The small neighborhood has center x (pixel x be the center) in radius w.
Suppose w=5, so I have 5x5 small neighborhood with pixel x is the center of neighborhood.
How can I make it?
Thank you.
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Vinai Datta Thatiparthi
2020년 2월 7일
Hello Yohanes,
val = imread(' ... '); % Your input matrix/image
[xCoOrd, yCoOrd] = [ ... ] % Co-Ordinates of the center pixel
nbh = 5; % Neighborhood Size
For a square neighborhood, the variable roi will hold the intensity values of neighboring pixels.
limit = floor(nbh/2);
roi = val(xCoOrd-limit:xCoOrd+limit, yCoOrd-limit:yCoOrd+limit);
Additionally, if you want the positions of the neighbors in subscripts,
rowLen = [xCoOrd - limit: xCoOrd + limit]'; % Range of Rows
colLen = [yCoOrd - limit: yCoOrd + limit]; % Range of Columns
rowIdx = meshgrid(rowLen, 1:nbh)'; % All the X coordinates of neighbors
colIdx = meshgrid(colLen, 1:nbh); % All the Y coordinates of neighbors
Hope this helps!
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Vinai Datta Thatiparthi
2020년 2월 21일
Hey Yohanes,
Yes, this approach could work as well. Simple if-else statements checking for edge cases, and then assigning the neighbors (the ones that are beyond scope) NaN values.
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