how to ellipse fitting to connected object?

how to ellipse fitting to connected object?

Answer 1

[Evan]

help regionprops

This allows you to return the orientation, major axis length, and minor axis length of binary data with regions that approximate ellipses.

See here for more: http://blogs.mathworks.com/steve/2010/07/30/visualizing-regionprops-ellipse-measurements/

The page also contains code for plotting your ellipse fits.

[Abo]

This image shows binary image of pigs. In red are ellipses for which I have attempted to fit to this picture. I want to fit theses ellipses to each animal, instead of an ellipse for connected animals (left one). How can I do this?

[Evan]

Regionprops performs its operations for each connected region of true values, so it treats that cluster of three pigs as a single entity.

The way you do this likely depends on the range of scenarios that you expect from your images. I would suggest looking through the functions in the Image Processing Toolbox, particularly those that relate to Segmentation to see which ones might be useful.

[Image Analyst]

You can use watershed to split them apart. http://blogs.mathworks.com/steve/2013/11/19/watershed-transform-question-from-tech-support/

Answer 2

[Abo]

thank you. your answers are so helpful.