Low-rate image retrieval with tree histogram coding

  • Authors:
  • Vijay Chandrasekhar;David M. Chen;Zhi Li;Gabriel Takacs;Sam S. Tsai;Radek Grzeszczuk;Bernd Girod

  • Affiliations:
  • Stanford University;Stanford University;Stanford University;Stanford University;Stanford University;Nokia Research Center, Palo Alto, CA;Stanford University

  • Venue:
  • Proceedings of the 5th International ICST Mobile Multimedia Communications Conference
  • Year:
  • 2009

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Abstract

To perform image retrieval using a mobile device equipped with a camera, the mobile captures an image, transmits data wirelessly to a server, and the server replies with the associated database image information. Query data compression is crucial for low-latency retrieval over a wireless network. For fast retrieval from large databases, Scalable Vocabulary Trees (SVT) are commonly employed. In this work, we propose using distributed image matching where corresponding Tree-Structured Vector Quantizers (TSVQ) are stored on both the mobile device and the server. By quantizing feature descriptors using an optimally pruned TSVQ on the mobile device and transmitting just a tree histogram, we achieve very low bitrates without sacrificing recognition accuracy. We carry out tree pruning optimally using the BFOS algorithm and design criteria for trading off classification-error-rate and bitrate effectively. For the well known ZuBuD database, we achieve 96% accuracy with only ~1000 bits per image. By extending accurate image recognition to such extremely low bitrates, we can open the door to new applications on mobile networked devices.