how center of mass of an image is calculated

sir, do you have any matlab code for finding center of mass of an image.

Answer 1

[Image Analyst]

Probably the easiest is to use regionprops(). Something like (untested)

binaryImage = true(size(grayImage));
labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, grayImage, 'WeightedCentroid');
centerOfMass = measurements.WeightedCentroid;

[raj kumar]

it works well.Thankyou sir

[Raghu Rao]

Am getting error in second line in your code.

[Raghu Rao]

Help me to find the number of foreground pixel in segment

[Walter Roberson]

Raghu Rao, it is not possible to do that completely automatically. "foreground" and "background" depend on intent. For example there are telescopes that study the Sun. For most purposes the Sun is the foreground in those images. However exactly the same images are also studied to detect solar comets, and to study those you have to block out the Sun and your foreground becomes everything else. A program cannot possibly know whether you intend to look at the Sun in the image or if you intend to look at the comets in the same image.

Therefore you need to define the characteristics you want your program to look for and write the program to match those.

[Image Analyst]

The original poster, Raj, didn't have a foreground and background. He asked about the entire image. If you have a foreground and background Raghu, I suggest you look at my Image Processing Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 If you're lucky, you can get them from simple thresholding. Otherwise you might need to do some preprocessing steps in order to get to a point where you can do thresholding. It all depends on what your image looks like. If you still need help, read this link and post your ENTIRE error message in a new discussion thread just for you.