How to fit irregular particle ROI to ellipse?

[cal28]

Hey all,

I'm using the analyze particle function in ImageJ 1.45c to find ellipse
particles.

However, I'm getting incomplete ellipses as shown below.



Does anyone know how to expand an irregular ROI to an ellipse?

Thanks in advance

cal28

[JesperSP]

How was the original image converted to the binary (black/white) that you include in your post? If it is made by thresholding it might be possible to improve the thresholding level. Otherwize it might be a good idea to use some-kind of image filtering (e.g. variance) before the thresholding.

You can do a binary operation called "close-" under the "Process" -> "Binary" menu. This effective works as if you perform a "Dilate" followed by a "Erode", and will close the space between particle "fragments" close together.

Cheers,
Jesper