Interest point detection is essential process for many computer vision applications, which must provide invariant points to several image variations, such as, rotation, zoom, blur, illumination variation and change of viewpoints. Harris-Affine detector is considered as one of the most effective interest point detectors, although it still presents vulnerability to some image. This paper proposes...

BACKGROUND Detection of delayed cerebral ischemia (DCI) in high-grade subarachnoid haemorrhage (SAH) is an unsolved issue. Conventional near-infrared spectroscopy (NIRS) with optodes applied over the skin is controversial because the NIRS signal is contaminated by extracerebral tissue. The objective is to quantify and subtract the contribution from extracerebral tissue from the signal by using ...

We develop a computationally efficient approximation of the maximum likelihood (ML) detector for 16 quadrature amplitude modulation (16-QAM) in multiple-input multiple-output (MIMO) systems. The detector is based on solving a convex relaxation of the ML problem by a box constrained optimization scheme. Simulation results in a random MIMO system show that this proposed approach outperforms the c...

| This paper proposes modiications to the Kalman lter-based multiuser code-division multiple-access (CDMA) detector of 1] based on the normalised least mean square (NLMS) lter, the motivation being complexity reduction. The variable step size and information reuse concepts are investigated. The proposed detectors are compared with the conventional and Kalman lter detector in terms of complexity...

Directly detecting the phase of a baseband signal from the ratio of the in-phase and the quadrature phase component, a delta-sigma phase detector can realize an AGC-free mobile communication receiver. This paper studies the performance of the phase detector applied to digital communication systems. Theoretically explaining phase quantization noise of the detector, we show the performance of a P...

In this paper, signed-rank based nonparametric detectors are used for pseudonoise (PN) code acquisition in direct sequence spread spectrum (DS/SS) systems. We first derive the locally optimum rank (LOR) detector, and then propose a locally suboptimum rank (LSR) detector and a modified signed-rank (MSR) detector using approximate score functions. We compare the single-dwell scheme without the ve...

1) Introduction One of the most serious problems that limits the capacity of CDMA systems is the multi-access interference (MAI), caused by the cross-correlation between spreading sequences of active users. The undesirable impact of the MAI becomes more remarkable and sometimes disastrous when the number of active users becomes large or when the power level of certain users is significantly hig...

We present an unsupervised anomaly detection method for hyperspectral imagery (HSI) based on data characteristics inherit in HSI. A locally adaptive technique of iteratively refining the well-known RX detector (LAIRX) is developed. The technique is motivated by the need for better firstand second-order statistic estimation via avoidance of anomaly presence. Overall, experiments show favorable R...

In this paper, the multistage multiuser detector for communication over multipath fading channel is considered. The detector consists of a matched filters bank and a linear equalizer whose outputs are diversity combined to produce initial data estimates. Using these data estimates multiuser interference is reconstructed and removed from the output signals of a the matched filters bank. Afterwar...