How to recognize the boundary of an object

Please let me know How to recognize the boundary of an object and determine the object area from that of an image in matlab. Thanks.

[Walter Roberson]

We will need some sample images to assist you, as different techniques are required for different situations.

Answer 1

[Image Analyst]

Assuming you have already segmented your object into foreground and background (you have a binary image), then try bwboundaries() to get a list of (x,y) coordinates, or bwperim() to get an image of the perimeter.

[Image Analyst]

roro, are you still alive?

[roro6992]

yea I am. Sorry for the late reply. N thanx. Ur ans worked :)