Characterizing the Reconfiguration Latency of Image Sensor Resolution on Android Devices
Characterizing the Reconfiguration Latency of Image Sensor Resolution on Android Devices
复制标题
表征 Android 设备上图像传感器分辨率的重新配置延迟
DOI：
10.1145/3177102.3177109
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
LiKamWa, Robert
中科院分区：
文献类型：
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作者：
Hu, Jinhan;Yang, Jianan;Delhivala, Vraj;LiKamWa, Robert
视觉处理的进步已经点燃了包括增强现实在内的移动的视觉应用的激增。然而，由于无法快速重新配置传感器操作以实现性能-效率权衡，高功耗会导致视觉应用耗尽设备的电池。为了探索实现快速重新配置的潜在影响，我们使用基于标记的姿势估计的案例研究来了解图像帧分辨率，任务精度和能源效率之间的关系。我们的案例研究表明，为了平衡能源效率和任务准确性，应用程序需要动态且频繁地重新配置传感器分辨率。为了探索传感器分辨率重新配置的延迟瓶颈，我们定义并分析了端到端重新配置延迟和帧到帧的延迟。在Google LG Nexus 5X设备上更改捕获分辨率。我们确定了当前Android系统中传感器分辨率重新配置延迟的三个主要来源：（i）顺序配置模式，（ii）昂贵的系统调用，以及（iii）成像管道延迟。根据我们的直觉，我们提出了一个重新设计的Android相机系统，以减轻延迟的来源。实现传感器配置之间的平滑过渡将开启新类别的自适应分辨率视觉应用。
Advances in vision processing have ignited a proliferation of mobile vision applications, including augmented reality. However, limited by the inability to rapidly reconfigure sensor operation for performance-efficiency tradeoffs, high power consumption causes vision applications to drain the device's battery. To explore the potential impact of enabling rapid reconfiguration, we use a case study around marker-based pose estimation to understand the relationship between image frame resolution, task accuracy, and energy efficiency. Our case study motivates that to balance energy efficiency and task accuracy, the application needs to dynamically and frequently reconfigure sensor resolution.To explore the latency bottlenecks to sensor resolution reconfiguration, we define and profile the end-to-end reconfiguration latency and frame-to-frame latency of changing capture resolution on a Google LG Nexus 5X device. We identify three major sources of sensor resolution reconfiguration latency in current Android systems: (i) sequential configuration patterns, (ii) expensive system calls, and (iii) imaging pipeline delay. Based on our intuitions, we propose a redesign of the Android camera system to mitigate the sources of latency. Enabling smooth transitions between sensor configurations will unlock new classes of adaptive-resolution vision applications.
SceneMan：通过场景通知将移动应用程序与系统能源管理器桥接
DOI：
--
发表时间：
2017
期刊：
International Symposium on Low Power Electronics and Design
影响因子：
--
作者：
Li Li;J. Wang;Xiaorui Wang;Handong Ye;Ziang Hu
通讯作者：
Ziang Hu
关于套接字和系统调用：最小化套接字 API 的上下文切换
DOI：
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发表时间：
2014
期刊：
International Conference on Timely Results in Operating Systems
影响因子：
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作者：
Tomás Hrubý;T. Crivat;H. Bos;A. Tanenbaum
通讯作者：
A. Tanenbaum