find foreground pixels in each segments in grid

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Raghu Rao 2017-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/326391-find-foreground-pixels-in-each-segments-in-grid

评论： Raghu Rao 2017-2-22

example.jpg

i want to find the foreground pixels in each segments in grid after finding the foreground pixel i want to find center of mass in each segments and i want to add nodes based on center of mass.

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Answer 1

Image Analyst 2017-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/326391-find-foreground-pixels-in-each-segments-in-grid#answer_255882

在 MATLAB Online 中打开

Like we've told you in some of your prior posts, extract each tile/block. Then use find() to get the rows and columns, then take the mean of those numbers to get the centroid.

[y, x] = find(yourImage(row1:row2, col1:col2));
centroidX = mean(x);
centroidY = mean(y);

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Raghu Rao 2017-2-22

在 MATLAB Online 中打开

formula to find centre of mass.jpg

A word image B is divided into C × R segments of equal size. For each segment sij (i = 1, . . . , C; j = 1, . . . , R) a node is inserted into the resulting graph and labelled by the (x, y)-coordinates of the centre of mass (xm, ym) Formally, we compute (please refer image for formula to compute centre of mass) where n denotes the number of foreground pixel in segment sij, while xw and yw denote the x- and y-coordinates of the foreground pixels in sij. If a segment does not contain any foreground pixel, no centre of mass can be determined and thus no node is created for this segment. i know the values of C and R c =

45

r =

45

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