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There are many modulation formats (such as FSK, PSK, ASK) in the process of underwater acoustic communication, and the task of the signal modulation identification is to distinguish the format that used from signals which received from acoustic communication. This technique for communication management, such as underwater acoustic communication spectrum monitoring, interference listening and signal...
Detection of surgical devices, in particular of guide-wire detection, is prerequisite during image-guided navigation in percutaneous coronary intervention (PCI). Guide-wire detection is a challenging task for following reasons: (i) X-ray images have a low signal-to-noise rate (SNR); (ii) there is a high similarity between guide-wires and some other adjacent anatomical skeletons' contours; (iii) guide-wires...
Loop closure is a well-known problem in the research of laser based simultaneous localization and mapping, especially for applications in large-scale environments. The cumulative errors in the estimated pose and map make the loop detection difficult, no matter using particle filter-based or graph-based SLAM methods. Camera has the advantage of rich information but suffers from short distance and relative...
In this paper, we present a real-time face recognition system for home security service robot which can be applied to recognize the person's face in front and give a warning when the identity of the person is a stranger. Considering the complexity of the actual situation, there might be some errors causing by the following factors like the angle, the size, the environment and the illumination of the...
With the rapid urbanization of Beijing in recent decades, comprehensively understanding its regions' structures and functions becomes more and more challenging, though it indeed plays a fundamental role in the city planning. While fortunately, the accumulation of huge mobility records from massive individuals provides an unprecedented big-data window for solving this issue. In this paper, we segment...
Feature selection can reduce the feature space dimension and improve recognition. In the discriminatory fresh degree of tomatoes by electronic nose, it used three kinds of feature extraction methods: sheath coefficient characteristics, similitude entropy characteristics and the energy characteristics, and the three methods were compared respectively. The results showed that similitude entropy characteristics...
The pattern recognition of remote sensing images is based on the different spectral characteristics of surface features to identify the features type, mainly including the supervised classification and unsupervised classification. In this paper, the TM remote sensing images are preprocessed firstly, and then land-covered features are classified using the maximum likelihood method, the minimum distance...
A novel semi-fragile watermark scheme for image authentication is proposed in this paper. New scheme extracts the image content features from the low frequency domain to generate watermarks, inserts obtained feature into the image by modulating the wavelet domain, and the watermark generation and embedment are disposed in the image. To enhance the robustness and invisibility, the adaptive quantization...
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