Problem in Blob extraction using bwareafilt()

Hello Everyone, I have two separate blobs in an image, which is separated by one pixel thick boundary. I tried to extract one out of them using bwareafilt( Imagedata,1). However, it did not work out- instead it gives me the same image without any error. Imagedata variable has Logical type. Even when I run regionprops() to find the centroid of each, it shows me only one centroid and considers as the connected blobs. Please find the attached file with this question (Mask.PNG). Thanking you in anticipation.

Answer 1

[Image Analyst]

You need to use 4-connectivity. It's using 8-connectivity and so it thinks the blobs are touching on the corners. Use 4 for the conn input to bwareafilt() and I bet it will be ok.

[Mahi]

Thanks very much, Image Analyst.