Parabolic Detection Algorithm of Tennis Serve Based on Video Image Analysis Technology

Abstract

At present, the existing algorithm for detecting the parabola of tennis serves neglects the pre-estimation of the global motion information of tennis balls, which leads to great error and low recognition rate. Therefore, a new algorithm for detecting the parabola of tennis service based on video image analysis is proposed. The global motion information is estimated in advance, and the motion feature of the target is extracted. A tennis appearance model is established by sparse representation, and the data of high-resolution tennis flight appearance model are processed by data fusion technology to track the parabolic trajectory. Based on the analysis of the characteristics of the serve mechanics, according to the nonlinear transformation of the parabolic trajectory state vector, the parabolic trajectory starting point is determined, the parabolic trajectory is obtained, and the detection algorithm of the parabolic service is designed. Experimental results show that compared with the other two algorithms, the algorithm designed in this paper can recognize the trajectory of the parabola at different stages, and the detection accuracy of the parabola is higher in the three-dimensional space of the tennis service.

Tennis Serve Trajectory Capture Algorithm Based on Wavelet Multiscale Decomposition

“…Such basis functions offer localization in the frequency domain. Compared with the Fourier transform, the wavelet transform emphasizes the local characterization of time-frequency [6]. e signal to be analyzed is decomposed at multiple scales, and the high-frequency part and the lowfrequency part of the signal are analyzed, respectively, by selecting an appropriate time window.…”

“…When Z � X, its expanded set is called a tight frame. If a continuous wavelet transform is discretized in scale and displacement, and the discretized function family satisfies the conditional formula (6), then the discrete wavelet transforms composed of this discrete wavelet system is given as follows:…”

“…However, the above methods still have the problems of poor track line capture and tracking effect, low accuracy, and efficiency. Tang [6] proposed a parabolic detection algorithm of tennis serve based on video image analysis technology. In this study, the author shows through experimental results that the proposed algorithm recognizes the trajectory of the parabola at various stages and the accuracy of the detection of the parabola is much larger in the 3-dimensional space of the tennis service.…”

Retracted: Parabolic Detection Algorithm of Tennis Serve Based on Video Image Analysis Technology

“…Tis article has been retracted by Hindawi, as publisher, following an investigation undertaken by the publisher [1]. Tis investigation has uncovered evidence of systematic manipulation of the publication and peer-review process.…”