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The precision of visual matching and the trade-off between accuracy and time efficiency have long been bottlenecks of image search systems. This work addresses the two problem simultaneously by introducing the coupled Multi-Index (cMI) structure. First, by combining SIFT and color features on the indexing-level, the discriminative power of visual words is greatly enhanced. Second, by reducing the...
Efficiency is of great importance for image retrieval systems. For this pragmatic issue, this paper proposes a fast image retrieval framework to speed up the online retrieval process. To this end, an impact score for local features is proposed in the first place, which considers multiple properties of a local feature, including TF-IDF, scale, saliency, and ambiguity. Then, to decrease memory consumption,...
In the tire pressure monitoring system (TPMS) based on the passive wireless surface acoustic wave (SAW) sensor, the phase error is quite high due to the DC offset, the amplitude and phase imbalance of inphase and quad-phase in analog quadrature demodulation, and the disconformity of two A/D converters. In order to improve the sensitivity and resolution of the passive wireless SAW sensor, a method...
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