Comparative Performance Evaluation of Image Descriptors Over IEEE 802.11b NoisyWireless Networks

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We evaluate the image retrieval procedure over an IEEE 802.11b Ad Hoc network, operating in 2.4GHz, using IEEE Distributed Coordination Function CSMA/CA as the multiple access scheme. IEEE 802.11 is a widely used network standard, implemented and supported by a variety of devices, such as desktops, laptops, notebooks, mobile phones etc., capable of providing a variety of different services, such as file transfer, internet access et.al. Therefore, we consider IEEE 802.11b being a suitable technology to investigate the case of conducting image retrieval over a wireless noisy channel. The model we use to simulate the noisy environment is based on the scenario in which the wireless network is located in an outdoor noisy environment, or in an indoor environment of partial LOS - Line-of-sight power. We used a large number of descriptors reported in literature in order to evaluate which one has the best performance in terms of Mean Average Precision - MAP values under those circumstances. Experimental results on known benchmarking database show that the majority of the descriptors appear to have decreased performance when transferred and used in such noisy environments.

Technologie Business

Comparative Performance Evaluation of Image Descriptors Over IEEE 802.11b Noisy Wireless Networks Presented by EvaggelosChatzistavros EvaggelosChatzistavros, Savvas A. Chatzichristoﬁs Georgios Stamatellos, KostantinosZagoris

Content Based Image Retrieval ,[object Object]

Anything ranging from a simple similarity matching metric to a robust image annotation engine can fall under the purview of CBIR.,[object Object]

Problems with wireless link ,[object Object]

Fading: Multiple copies of the same signal reach the receiver

BER: Bit Error Rate, affected by the above factors, has an effect on transmitted data,[object Object]

Transport protocol: UDP– User Datagram Protocol

Increased BER values lead to increased number of errors (bits) at the descriptor ,[object Object],[object Object]

Retrieval scenario 1 – Simulation results MAP over different BER

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Comparative Performance Evaluation of Image Descriptors Over IEEE 802.11b NoisyWireless Networks

1. Comparative Performance Evaluation of Image Descriptors Over IEEE 802.11b Noisy Wireless Networks Presented by EvaggelosChatzistavros EvaggelosChatzistavros, Savvas A. Chatzichristoﬁs Georgios Stamatellos, KostantinosZagoris

2. Retrieval over noisy channel. Why?

6. Fading: Multiple copies of the same signal reach the receiver

8. Rician fading

10. IEEE 802.11 b, 11Mbps

11. 200 – 250 m distance between nodes

12. Transport protocol: UDP– User Datagram Protocol

13. BER values: 0, 0.001, 0.01, 0.1, 0.17

14. Descriptor is transferred between nodes

15.

16. Retrieval scenario 1 – Simulation results MAP over different BER

17.

18. IEEE 802.11 b, 11Mbps