Replace the greyscale shapes (Range 0-255) in the original image by their respective centroids (commonly used after the 8-bit labelling operators).

 

function call:

[out_img1]=vsg('Centroid',in_img1);

 

Arguments:

in_img1 input image, 3 channel RGB, 1 channel greyscale or binary image, or DICOM image.

 

Description:

Replace grey scale shape by a single pixel at its centre of gravity. The Centroid function is limited by the fact that it can have maximum 255 blobs in a scene. It is also assumes a black background which is ignored in the centroid calculation. This approach is based on the fact that all the shapes must have a distinct grey scale. out_img1- An image which contains a white pixel representing the centroid of each white blob in the input image.

 

Example:

img1=openimage('blobs.jpg');

[img1] = vsg('Threshold',img1,100);

[out_img1]=vsg('Centroid',img1);

h=figure;image(uint8(img1));set(h,'Name','Input image');

h=figure; imagesc(uint8(out_img1));set(h,'Name','Centroid image');

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