Abstract: A method of tracking a guidewire in video imagery includes: obtaining a first video image including pixels associated with features of a guidewire; selecting a set of parameters to define an open curve on the first video image; determining a feature map of the first video image using phase congruency; and updating the parameters of the open curve using the feature map to align the open curve to the pixels associated with the features of the guidewire.

Abstract: A method and system for rapidly processing a call when one of a plurality of user agents (UAs) in a dormant state makes a traffic transmission request in a wireless telecommunication system. The wireless telecommunication system includes an access network (AN) for simultaneously performing group communication with at least two UAs. When no data is generated for a predetermined time after a traffic channel has been set up in an active state, the traffic channel is released and the UA transitions to the dormant state based on a suspended mode. A slot cycle index value is set to a first slot cycle index value for a slot mode operation in the dormant state based on the suspended mode, and the AN is notified of the first slot cycle index value. A paging message is received according to a paging time adjusted by the AN using the first slot cycle index value.

Abstract: A method and system for setting up a call for a Push-to-Talk (PTT) service in a cellular mobile communication system including at least two user agents, each of the user agents serving as a talker or a listener. A talker transmits a first PTT request message for starting a PTT call to a PTT server over a reverse common channel, and sets up a traffic channel to a corresponding radio access network. The PTT server transmits a second PTT request message to a listener in a dormant state over a forward common channel, and the listener sets up a traffic channel to a corresponding radio access network in response to the second PTT request message. The listener sets up the traffic channel, and transmits a PTT confirm message to the PTT server over a reverse common channel in response to the second PTT request message. The talker transmits voice packets to the listener over the set traffic channel via the PTT server.