Video recovery system and method
View Patent ↗A recover system and method for a wireless video communication system. The system comprises: a transmitter for transmitting encoded video data to a wireless device; a receiver for receiving a return signal from the wireless device; a signal analysis system for analyzing the return signal to determine if a degraded signal condition exists between the transmitter and wireless device; and a recovery system that converts a predictive video frame in the encoded video data into an intra-coded video frame if the degraded signal condition exists.
1. A wireless video communication system, comprising:
a transmitter for transmitting encoded video data to a wireless device;
a receiver for receiving a return signal from the wireless device;
a signal analysis system for analyzing the return signal to determine if a degraded signal condition exists between the transmitter and wireless device; and
a recovery system that converts a predictive video frame in the encoded video data into an intra-coded video frame if the degraded signal condition exists.
2. The wireless video communication system of claim 1 , wherein the encoded video data is encoded under an MPEG format, the predictive video frame comprises a P frame, and the intra-coded video frame comprises an I frame.
3. The wireless video communication system of claim 1 , wherein the wireless device comprises a cellular device.
4. The wireless video communication system of claim 1 , wherein the wireless device comprises a personal digital assistant.
5. The wireless video communication system of claim 1 , wherein the wireless device comprises a video telephone.
6. The wireless video communication system of claim 1 , wherein the degraded signal condition is determined to exist if a strength of the return signal fades below a predetermined threshold.
7. The wireless video communication system of claim 1 , wherein the degraded signal condition is determined to exist if the return signal includes an error message from the wireless device.
8. The wireless video communication system of claim 1 , wherein the recovery system includes an MPEG decoder.
9. The wireless video communication system of claim 1 , wherein the recovery system is remotely accessible over a network.
10. A program product stored on a recordable medium, which when executed, provides a system for recovering encoded video data being transmitted from a base station to a wireless device, wherein the program product comprises:
a system for analyzing a return signal from the wireless device to determine if a degraded signal condition exists between the base station and wireless device; and
a system that converts a predictive video frame in the encoded video data into an intra-coded video frame if the degraded signal condition exists.
11. The program product of claim 10 , wherein the encoded video data is encoded under an MPEG format, the predictive video frame comprises a P frame, and the intra-coded video frame comprises an I frame.
12. The program product of claim 10 , wherein the degraded signal condition is determined to exist if a strength of the return signal fades below a predetermined threshold.
13. The program product of claim 10 , wherein the degraded signal condition is determined to exist if the return signal includes an error message from the wireless device.
14. The program product of claim 10 , wherein the system that converts includes an MPEG decoder.
15. A method of recovering lost video data in a wireless video communication system, comprising the steps of:
transmitting encoded video data from a base station to a wireless device;
receiving at the base station a return signal from the wireless device;
analyzing the return signal to determine if a degraded signal condition exists between the base station and wireless device; and
converting a predictive video frame in the encoded video data into an intra-coded video frame if the degraded signal condition exists.
16. The method of claim 15 , wherein the converting step is done locally at the base station.
17. The method of claim 15 , wherein the converting step is done remotely over a network.
18. The method of claim 15 , wherein the degraded signal condition exists if a strength of the return signal fades below a predetermined threshold.
19. The method of claim 15 , wherein the degraded signal condition exists if the return signal includes an error message.
20. A video recovery system for use when transmitting frames of encoded video from a first device to a second device, the system comprising:
a signal analysis system at the first device for receiving a return signal from the second device and determining if a degraded signal condition exists between the first device and the second device; and
a recovery system that transmits an intra-coded video frame in place of a video frame having predictive elements if the degraded signal condition exists.
21. The video recovery system of claim 20 , further comprising a system that converts the video frame having predictive elements to the intra-coded video frame.
22. The video recovery system of claim 21 , wherein the system that converts the video frame having predictive elements to the intra-coded video frame can operate on one or more individual layers.
23. The video recovery system of claim 20 , wherein the video frame having predictive elements is encoded using a partial intra refresh method.