APSIPA Transactions on Signal and Information Processing > Vol 4 > Issue 1

Capture-to-display delay measurement for visual communication applications

Haoming Chen, University of Washington, USA, eehmchen@uw.edu , Chao Wei, Zhejiang University, China, Mingli Song, Zhejiang University, China, Ming-Ting Sun, University of Washington, USA, Kevin Lau, T-Mobile USA, USA
 
Suggested Citation
Haoming Chen, Chao Wei, Mingli Song, Ming-Ting Sun and Kevin Lau (2015), "Capture-to-display delay measurement for visual communication applications", APSIPA Transactions on Signal and Information Processing: Vol. 4: No. 1, e19. http://dx.doi.org/10.1017/ATSIP.2015.21

Publication Date: 16 Dec 2015
© 2015 Haoming Chen, Chao Wei, Mingli Song, Ming-Ting Sun and Kevin Lau
 
Subjects
 
Keywords
Capture-to-display delay, Space and color diversity, Video codec and visual communication
 

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Journal details

Open Access

This is published under the terms of the Creative Commons Attribution licence.

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In this article:
I. INTRODUCTION 
II. PROPOSED METHOD FOR DELAY MEASUREMENT 
III. PROBLEM OF MULTIPLE-OVERLAPPED TIMESTAMPS 
IV. SOLUTION OF OVERLAPPED TIMESTAMPS – SPACE DIVERSITY AND COLOR DIVERSITY 
V. IMPLEMENTATION OF THE MEASUREMENT SYSTEM AND SIMULATION RESULTS 
VI. CONCLUSIONS 

Abstract

We propose a 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 be synchronized. Furthermore, we propose a solution to solve the multiple-overlapped-timestamp problem due to the exposure time of the camera. We analyze the measurement error, and implement the method in software to measure the CDD of a cellphone video chat application over various types of networks. Experiments confirm the effectiveness of our proposed method.

DOI:10.1017/ATSIP.2015.21