Image processing method for conference television system

Abstract

The method includes following steps. Receiving party monitors CRC in line in real time. When finding sliding code, the receiving party sends readjustment request to opposite terminal. With the request being received, the opposite terminal sends the acknowledgement signal and time delay test data. With the acknowledge signal being received, the receiving party starts new time delay and time delay readjustment is carried out. When the time delay adjustment is completed, the receiving party sends the request of finishing time delay adjustment to opposite terminal. Thus, the procedure for processing the sliding code is carried out interactively till time delay readjustment is finished and acknowledged. MCU and terminal detect out whether sliding code happens or not in real time. If it happens, time delay readjustment is carried out in order to ensure receiving party fetches video bit stream and HMLP data to recover image.

Description

technical field [0001] The invention relates to the field of multimedia video communication, in particular to an image processing method in a video conference system. Background technique [0002] In the prior art, BONDING (bonding) mode 1 is usually used for intercommunication between videoconferencing ISDN terminals. However, when an ISDN terminal connects to the MCU using BONDING mode 1, the terminal image will freeze due to changes in line delay during the conference. Specifically, when the MCU (Multipoint Control Unit) in the video conferencing system uses PRI or BRI (Basic Rate Interface) to access ISDN terminals or intercommunicate between ISDN terminals, it binds a single B channel into the required B channel through BONDING protocol mode 1 bandwidth, and rearrange the order of channels on the receiving side to eliminate the delay between individual B channels. Generally speaking, after the channel is established, the relative delay between the channels will not ch...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the fact that the clocks between the B channels are not strictly synchronized, the lower-level clocks cannot be well synchronized with the upper-level clocks, the switch resets the port, and the trunk circuit is switched, etc., the relative delay between the B channels is caused. It changes again (we call it slip code), but the MCU and the terminal are still adjusted according to the relative delay value calculated for the first time, which makes the receiver unable to extract accurate video bit stream, HMLP and other data , from the phenomenon point of view is the solidification of the terminal image

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