Existing word image retrieval algorithms suffer from either low retrieval precision or high computation complexity. We present an effective and efficient approach for word image matching by using gradient-based binary features. Experiments over a large database of handwritten word images show that the proposed approach consistently outperforms the existing best handwritten word image retrieval algorithm. Dynamic Time Warping (DTW) with profile-based shape features. Not only does the proposed approach have much higher retrieval accuracy, but also it is 893 times faster than DTW.
Several dissimilarity measures for binary vectors are formulated and examined for their recognition capability in handwriting identification for which the binary micro-features are used to characterize handwritten character shapes. Pertaining to eight dissimilarity measures, i.e., Jaccard-Needham, Dice, Correlation, Yule, Russell-Rao, Sokal-Michener, Rogers-Tanmoto and Kulzinsky, the discriminary power of ten individual characters and their combination is exhaustively studied. Conclusions are made on how to choose a dissimilarity measure and how to combine hybrid features.
This paper describes a new method for geometric correction of NOAA AVHRR data by using Landsat TM data. In this method, it mainly includes these procedures: (1) spatial degradation of Landsat TM data; (2) interpolation of AVHRR data; (3) preprocessing of degraded TM and interpolated AVHRR images; (4) image registration between the degraded TM image and interpolated AVHRR image at a same spatial resolution. With this method, we can get GCP's to implement accurate geometric correction of NOAA AVHRR Image, and achieve subpixel accuracy in geometric registration of AVHRR images.
Integrated optical rotation sensor (IORS) is a new type of optical sensors. In this paper, an integrated acousto-optic frequency shifter (AOFS) with surface acoustic wave (SAW) is developed as one of key integrated elements of IORS. The design, fabrication and test of acousto-optic frequency shifter with SAW are presented. The wedge of zinc oxide film on glass substrate is designed as new structure for using in IORS. Experimental results show that the performance of zinc oxide film is stable, the linearity of zinc oxide wedge is suitable for improving Bragg diffraction efficiency, and some good mono-mode performances of planar waveguide are obtained. The frequency shift of 198 MHz plus or minus 0.75 MHz, diffraction efficiency of 8% (at optical wavelength of 0.63 micrometer), and 3 - 5% (at optical wavelength of 1.06 micrometer) are obtained at 1 Watt of electrical power. These experimental results satisfy the main requirements of IORS. High frequency stability is the main specification of RF driving circuits for using SAW AOFS in IORS. In this paper, a new digital scheme based on direct digital synthesis is presented for improving frequency stability.
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