# 4.3 Fitting ellipse iPeriGrain provides a tool to fit ellipse of each segments. - The processing time for fitting ellipse depends on CPU and number of segments in the 2D image. - Click "Fit" to proceed. - After examing the fitted ellipses, if further ReSegment is needed, click "Close" to clean the fitted ellipses. -- segmentaion result overlayed on optical image ![](https://i.imgur.com/SDX9ulL.jpg) -- ellipse fitting result ![](https://i.imgur.com/tvfOu0P.jpg)