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While computation offloading promises a solution for high-quality and interactive mobile AR, existing methods work best for high-definition videos but cannot meet the real-time requirement for emerging 4K videos due to the long uploading latency. We introduce ACTOR, a novel computation-offloading framework for 4K mobile AR. To reduce the uploading latency, ACTOR dynamically and judiciously downscales the mobile video feed to be sent to the remote server. On the server-side, it leverages image super-resolution technology to scale back the received video so that high-quality object detection, tracking and rendering can be performed on the full 4K resolution. ACTOR employs machine learning to predict which of the downscaling resolutions and super-resolution configurations should be used, by taking into account the video content, server processing delay, and user expected latency. We evaluate ACTOR by applying it to over 2,000 4K video clips across two typical WiFi network settings. Extensive experimental results show that ACTOR consistently and significantly outperforms competitive methods for simultaneously meeting the latency and user-perceived video quality requirements.<\/jats:p>","DOI":"10.1145\/3494958","type":"journal-article","created":{"date-parts":[[2021,12,30]],"date-time":"2021-12-30T17:40:33Z","timestamp":1640886033000},"page":"1-30","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":17,"title":["Adaptive Computation Offloading for Mobile Augmented Reality"],"prefix":"10.1145","volume":"5","author":[{"given":"Jie","family":"Ren","sequence":"first","affiliation":[{"name":"School of Computer Science, Shaanxi Normal University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ling","family":"Gao","sequence":"additional","affiliation":[{"name":"School of Information Science &amp; Technology, Northwest University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoming","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Computer Science, Shaanxi Normal University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miao","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Computer Science, Shaanxi Normal University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guoyong","family":"Qiu","sequence":"additional","affiliation":[{"name":"School of Computer Science, Shaanxi Normal University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hai","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Information Science &amp; Technology, Northwest University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Information Science &amp; Technology, Northwest University, Xian, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zheng","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Computing, University of Leeds, United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2021,12,30]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/3356250.3360044"},{"key":"e_1_2_1_2_1","unstructured":"Apple. 2020. 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