The KCF algorithm uses the response values of the template and the test sample to calculate the target position. The location of the maximum response value is the target region. However, the KCF algorithm does not set the target loss warning mechanism. The target will be lost when the tracking process encounters complicated conditions such as scale chance, rapid movement, and severe obstruction. At this point, the tracker will update the background information into the template. The accumulated deviation of the template will cause the tracker cannot be correctly identified and tracked when it encounters the target again. To solve this problem, through the statistics of the maximum response value of each frame of the video sequence, it founds that the overall response of the video sequence has a normal distribution trend, and the maximum response value of the frame will fluctuate abnormally in the frames that are lost or are about to be lost. This paper uses the idea of hypothesis testing in mathematical statistics. This paper uses a set of fixed-dimensional response peak data to perform hypothesis testing on the peak value of the current frame response. If the response peak of the current frame falls within the rejection region, the target is determined to be lost or is about to be lost. The experimental results prove that the proposed method can correctly implement the early warning function when verifying the OTB standard test sequence. It can provide reference for when to load redetection after target is lost.
KEYWORDS: Doppler effect, Laser Doppler velocimetry, Signal processing, Optical signal processing, Signal to noise ratio, Velocity measurements, Light scattering, Signal detection, Particles, Sensors
Laser Doppler Anemometry (LDA) is a most advanced velocity measurement technique in the field of fluid mechanics, combustion, hydraulics, chemical engineering, meteorology, biomedicine engineering and industrial manufactory for its non-contact, high response, and real-time velocity measurement. In LDA technique, optical signal processing is very important and very complex due to complicated flowing properties of fluid. LDA system includes optical section and signal processing section. In conventional LDA system, these two sections are separated and perform their own functions individually. Because optical section has no active control to measured signal, only mechanically indicates the variation of measured signal, the signal processing section was designed complex and costly. The existed signal-processing methods have different problems which limited the application and in turn increasing the difficulty of signal processing to detect the complex fluid. This paper describes and analyzes a new technique, C/T technique which combined optical section and signal processing section together, made the output signal simpler and solved the problems occurred in tradition methods. On the basis of analysis of C/T method, system construction is described.
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