Wireless video transmission device, wireless video reception device and wireless video communication system using same

摘要

In a wireless video communication system, a wireless camera has an image capturing unit for generating video data, a video clipping unit for generating high priority video data and lower priority video data having mutually different image regions from the video data, a first and a second wireless communication unit for communicating with a first and a second access point and a communication control unit for controlling the wireless communication by the first and second wireless communication units. The communication control unit can cause the high priority video data and lower priority video data to be transmitted from the first and second wireless communication units as two individual video streams, and is configured to determine whether each wireless communication unit should transmit none, one or both of the video streams depending on the wireless communication quality and the condition of a handover.

主权项

1. A wireless video transmission device, comprising:
a first wireless communication unit structured to communicate with a first access point; a second wireless communication unit structured to communicate with a second access point serving as a candidate for a handover destination from the first access point; and a communication control unit structured to control wireless communication operations of the first and second wireless communication units; wherein the communication control unit determines if a transmission is to be made for each of the first and second wireless communication units according to a quality of communication with the first access point and a status of handover to the second access point, and transmits encoded high priority video data and low priority video data having at least one of mutually different image regions and mutually different image resolutions from the first and second wireless communication units, respectively, as two individual video streams comprising a high priority video stream and a low priority video stream, wherein the communication control unit causes the high priority video stream and the low priority video stream to be transmitted from the first wireless communication unit to the first access point when the quality of communication does not meet a first reference criterion as to whether a transmission is to be made, and wherein the communication control unit causes the high priority video stream to be transmitted from the second wireless communication unit to the second access point when the quality of communication does not meet a second reference criterion which is poorer than the first reference criterion.