Abstract. We propose a new algorithm for ship detection in synthetic aperture radar (SAR) images based on the human visual attention system. The human visual attention system identifies the prominent objects in images or scenes so that these objects can be more noticeable. Since the ships in a SAR image of the ocean are prominent objects, they can easily be identified through the human visual attention system. Thus, for detection of ships in the SAR images, the present study (through its application) has modeled the human visual attention system in the detection stage. In this way, not only can the targets be precisely detected, but also the falsely detected pixels are significantly reduced. Compared to most existing algorithms in the literature, our proposed algorithm can be used for both homogeneous and nonhomogeneous images. Accordingly, its performance is independent of the image type (homogeneous or nonhomogeneous) and the computation time significantly decreases. Experimental results have shown the efficiency of the proposed algorithm for various SAR images from ERS-1, ERS-2, and ALOS PALSAR data.
This paper presents an approach for early breast cancer diagnostic by employing combination of artificial neural networks (ANN) and wavelet based subband image decomposition which detect microcalcification in digital mammograms. The microcalcifications correspond to high-frequency components of the image spectrum, detection of microcalcifications is achieved by decomposing the mammograms into different frequency subbands, suppressing the low-frequency subband, and finally, reconstructing the mammogram from the subbands containing only high frequencies. For this approach we employed different types of wavelet packets. We used the result as an input of neural network for classification. The proposed methodology is tested using the Nijmegen and the Mammographic Image Analysis Society (MIAS) mammographic databases and images collected from local hospitals. Results are presented as the receiver operating characteristic (ROC) performance and are quantified by the area under the ROC curve.
This paper presents an approach for detecting microcalcification in digital mammograms employing combination of artificial neural networks (ANN) and wavelet-based subband image decomposition. The microcalcifications correspond to high-frequency components of the image spectrum, detection of microcalcifications is achieved by decomposing the mammograms into different frequency subbands, suppressing the low-frequency subband, a and finally, reconstructing the mammogram from the subbands containing only high frequencies. We use these results as an input of neural network for classification. The neural network contains one input, two hidden and one output layers. Layers have 30, 45, 20, and 1 neurons respectively The proposed methodology is tested using the Nijmegen and the Mammogr-aphic Image Analysis Society (MIAS) Mammographic databases. Results are presented as the receiver operating characteristic (ROC) performance and are quantified by the area under the ROC curve (Az)
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