As a potential workaround, you may think of applying segmentation technique such as Watershed segmentation to get the boundaries around different object in the image. The binary segmentation mask can be useful to get the distinct features such as Area, Major and Minor axis lengths, eccentricity etc. using “regionprops” function. Then, object of interest can be obtained by applying set of rules based on learned features.
Refer the following MATLAB documentation link to know more about watershed segmentation.
