A capture-to-display delay measurement system for visual communication applications

摘要

We propose an effective method to measure the capture-to-display delay (CDD) of a visual communication application. The method does not require modifications to the existing system, nor require the encoder and decoder clocks to be synchronized. Furthermore, we propose a solution to solve the multiple overlapped-timestamp problems due to the response time of the display and the exposure time of the camera. We implemented the method in software to measure the capture-to-display delay of a cellphone video chat application over various types of networks. Experiments confirmed the effectiveness of our proposed methods.