MATLAB: Finding the gravity of blob or amorphous form in picture

gravity center in picture

how can I obtain the exact center point of gravity in picture and in amorphous form?

Best Answer

Use regionprops() in the Image Processing Toolbox. Or just use the regular formula of the sum of the gray levels times the distance divided by the sum of the gray levels (do it in both x and y directions).

Related Solutions

MATLAB: Find the the gravity

Did you run my Image Segmentation Tutorial? http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 All you have to do is replace Centroid by WeightedCentroid and it will give you the center of gravity. Centroid does not do that - it assumes all pixels in the blob are weighted the same (have the same gray level), in other words, it uses only the binary image, not the grayscale image.

MATLAB: Compare using centroiding algorithm of image or binary image

The first way is the weighted centroid. The weighted centroid takes into account the gray levels of the image. A centroid based on the binary image alone does not. So if your image is brighter on the left side, then the weighted centroid will be to the left of the centroid just based on the binary image. You can get both with regionprops by passing in both the gray scale image and the binary image into regionprops:

measurements = regionprops(labeledImage, grayImage, 'Centroid', 'WeightedCentroid');

Best Answer

Related Solutions

MATLAB: Find the the gravity

MATLAB: Compare using centroiding algorithm of image or binary image

Related Question