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New fast normalized neural networks for pattern detection
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DOI：10.1016/j.imavis.2007.02.001.png)
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摘要
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Neural networks have shown good results for detecting a certain pattern in a given image. In this paper, fast neural networks for pattern detection are presented. Such processors are designed based on cross correlation in the frequency domain between the input image and the input weights of neural networks. This approach is developed to reduce the computation steps required by these fast neural networks for the searching process. The principle of divide and conquer strategy is applied through image decomposition. Each image is divided into small in size sub-images and then each one is tested separately by using a single fast neural processor. Furthermore, faster pattern detection is obtained by using parallel processing techniques to test the resulting sub-images at the same time using the same number of fast neural networks. In contrast to fast neural networks, the speed up ratio is increased with the size of the input image when using fast neural networks and image decomposition. Moreover, the problem of local sub-image normalization in the frequency domain is solved. The effect of image normalization on the speed up ratio of pattern detection is discussed. Simulation results show that local sub-image normalization through weight normalization is faster than sub-image normalization in the spatial domain. The overall speed up ratio of the detection process is increased as the normalization of weights is done offline. (c) 2007 Elsevier B.V. All rights reserved.
Keyword:
fast pattern detection
neural networks
cross correlation
image normalization
parallel processing
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