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Camera calibration is an important issue in computer vision. In this paper, we propose an improved camera auto-calibration algorithm from sequential images based on VP (vanishing point) and EKF (extended Kalman filter) to determine camera intrinsic parameters. This is the first vanishing point-based auto-calibration algorithm, which only uses a sequence of monocular images as input without any other...
Currently, there exists a large amount of mouse ultrasonic vocalization data to be analyzed. However, manual annotation of mouse ultrasonic vocalization data requires a lot of human efforts and sometimes it is a mission impossible. As a result, a method is proposed in this paper to filter out the noise in the vocalization recordings and automatically identify the occurrence of mouse vocalization calls...
While FastSLAM algorithm is a popular solution to SLAM problem, it suffers from two major drawbacks: one is particle set degeneracy due to lack of observation information in proposal distribution; the other is errors accumulation caused by inaccuracy linearization of the robot motion model and the observation model. To overcome the problems, we propose a new Jacobian free CFastSLAM algorithm. The...
This paper studies the mathematical modeling of an electrohydrostatic actuator (EHA) for the purpose of fault detection and diagnosis. A relatively new model-based fault detection strategy referred to as the interacting multiple model and smooth variable structure filtering method (IMM-SVSF) is applied on an experimental apparatus. The results of this application are compared with the popular Kalman...
We propose a low-power active switched-capacitor (SC) implementation of the loop filter for PLL applications. Control voltage ripples caused by current mismatches are eliminated. Sub-threshold inverters are employed as the active components of the filter resulting in very low circuit power consumption. Moreover, 1/f noise of the inverter amplifier is suppressed by the SC auto-zeroing. Transistor level...
Previous research showed that satisfaction with one or more environmental factor does not necessarily produce equal satisfaction with the total environment and not all factors are equally important. In addition, the relative importance of the various factors differed from country to country. In order to gain a better understanding of the influential factors of office environmental satisfaction in...
A 3-bit 3rd-order Sigma-Delta modulator employing a switched-capacitor multiply-by-N DAC is described in this paper. The DAC is implemented in a capacitor mismatch independent way to improve circuit linearity. Theoretical analysis on the effect of finite op amp DC gain on DAC linearity is given. A prototype Sigma-Delta modulator for verification purpose was built with discrete components on printed...
This paper presents a novel method for highlight extraction in sports video, which fuses multi-modal features including audio and visual. At first, we detect slow-motion replay based on logo, and then detect audience cheers based on pitch frequency and short-time energy. In the next step, we fuse audio-visual features to detect highlight events through using a special "and" (otimes) operation...
This paper describes the design of high performance 2K times 2K CCD camera that is part of the Halpha imaging system to be used in Space Solar Telescope. The camera is composed of analog system and the digital embedded system integrated with a NIOSII soft-core processor. Performance evaluation results of the camera are also shown in this paper. In addition, experimental observations of solar phenomena...
In this paper, we propose an adaptable-order single-loop digital DeltaSigma modulator which offers flexible noise shaping performance to maximize hardware sharing and power efficiency in multi-band frequency synthesizer applications. The proposed architecture utilizes feedback coefficients that allow computationally efficient digital implementation and also yield good noise shaping. Fixed-magnitude...
In this paper, we propose an implementation for digital delta-sigma modulators named as threshold direct synthesis structure. The proposed configuration increases modulator throughput by decomposing a delta-sigma loop into two events, which can be completed in one input clock period. A third-order single-loop digital modulator is implemented using this method and an output/input rate ratio of 1:1...
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