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A Hybrid Mobile Visual Search System With Compact Global Signatures

机译:具有紧凑全局签名的混合移动视觉搜索系统

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摘要

Mobile visual search systems typically compare a query image against a database of annotated images for accurate object recognition. On-server database matching can search a large database hosted in the cloud, but the query latency could suffer with slow network transmissions or server congestion . On-device database matching can ensure fast recognition responses regardless of network or server conditions , but a small amount of memory on the mobile device can severely limit the number of images that can be stored in an on- device database. This paper presents a new hybrid system that combines the advantages of on-device and on-server database matching. At the core of this system, we first develop a compact and discriminative global signature to characterize each image. Our global signature uses an optimized local feature count that is derived from a statistical analysis of the retrieval performance . We additionally create two extensions that exploit color information within images and relationships between similar database images to improve retrieval accuracy. Then, we propose methods for efficient interframe coding of a sequence of global signatures which are extracted from the viewfinder frames on the mobile device. A low bitrate stream of global signatures can be sent to the server at an uplink bitrate of less than 2 kbps to broaden the search range of the current query and to update the on-device database to help future queries.
机译:移动视觉搜索系统通常将查询图像与带注释的图像的数据库进行比较,以实现准确的对象识别。服务器上的数据库匹配可以搜索托管在云中的大型数据库,但是查询延迟可能会因网络传输缓慢或服务器拥塞而受到影响。设备上的数据库匹配可以确保快速识别响应,而不管网络或服务器状况如何,但是移动设备上的少量内存会严重限制可以存储在设备上的数据库中的图像数量。本文提出了一种新的混合系统,该系统结合了设备上和服务器上数据库匹配的优点。在该系统的核心,我们首先开发一个紧凑而有区别的全局签名来表征每个图像。我们的全局签名使用从检索性能的统计分析得出的优化的局部特征计数。我们还创建了两个扩展,这些扩展利用图像中的颜色信息以及相似数据库图像之间的关系来提高检索精度。然后,我们提出了对从移动设备上的取景器帧中提取的全局签名序列进行有效帧间编码的方法。可以以小于2 kbps的上行链路比特率将低比特率的全局签名流发送到服务器,以扩大当前查询的搜索范围并更新设备上的数据库以帮助将来的查询。

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