Hi Vasanth,
Well, it's embedded as base64 encoded string in the form so there isn't really a path per se. There is an xpath to the mso-inline encoded attribute and some other details to get the image out. I am pretty sure that this is documented on the Microsoft InfoPath blog site. Please go to resources (or Google) and try searching the InfoPath blog written by the MS guys.
Patrick Halstead [InfoPath MVP]
InfoPathDev
Patrick Halstead
Project Manager at Qdabra