End-to-end video transmission delay measurement display device and measurement system

Abstract

The invention discloses a measurement display device and a measurement system for an end-to-end video transmission delay. The device comprises a high-speed time stamp generator and at least two display controllers, wherein each display controller is connected with a display unit; the display units are in arrayed distribution to form a display array; the high-speed time stamp generator is used for acquiring synchronous time from a GPS (Global Positioning System) time service clock at a predetermined time interval to generate a time stamp and sending the time stamps generated in different periods of time to the display controllers in sequence; the display controllers are used for acquiring the time stamps which are sent from the high-speed time stamp generator so as to drive the display array; the display array is used for displaying the time stamps generated in different periods of time on each display unit in sequence respectively. According to the device and the system, the measurement accuracy of a time delay is improved, and the requirements on the time delay measurement accuracy of a video processing system which is highly sensitive to the time delay are met; meanwhile, measurement system equipment is simple, and the cost is greatly reduced.

Description

Technical field [0001] The invention relates to the field of time delay measurement of video transmission systems, in particular to an end-to-end video transmission delay measurement display device and a measurement system. Background technique [0002] Time delay is the time sequence between input and output of the video processing system. Each component of the video processing system, such as video capture, encoding, transmission, decoding, display, as well as interfaces and buffers, will cause delays. The end-to-end time delay is also called CDL (Capture-to-Display Latency), which refers to the time difference from the time the sending end collects the video picture to the receiving end displaying the video picture. CDL is one of the important indicators to measure the service quality of the video transmission system, which quantitatively characterizes the real-time nature of the system. There are many methods for measuring the delay of end-to-end video, and domestic and for...

AI Technical Summary

Problems solved by technology

Although this type of method does not require expensive professional testing equipment, the accuracy of the measured time delay is limited by the refresh rate of the computer monitor, the display delay, the frame rate of the camera, the exposure time, and the synchronization accuracy of the clocks at both ends of the transceiver. Its measurement accuracy is low

This type of method is often used for low-precision measurement of video delay in IP networks, and its measurement accuracy cannot meet the measurement requirements of video processing systems that are highly sensitive to delay, such as terrestrial digital TV, real-time reconnaissance of UAVs, infrared imaging guided weapons, remote Surgical system, etc.

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