Towards a Data-Driven Approach to Injury Prevention in Construction

Human Activity Recognition for Production and Logistics—A Systematic Literature Review

“…Table 11 shows the statistical features that are mentioned in the publications in Table 7. Time-domain features focuses on the waveform characteristics, and frequency-domain features focus on the periodic structure of the signal [90]. The Fourier transform is applied to the raw-or pre-processed signals to acquire the estimated spectral density of the time series.…”

“…As a remark, the authors of [64] mentioned the usage of time-and frequency-domain features, but they did not specify which ones exactly. [29,45,48-50,53,55,56,59,61-63, 65,67-69,71,72,75,76,78,80-82, 89-91] Pairwise Correlation Correlation between every pair of axes [50,53,55,56,[60][61][62]65,69,78,80,82,89,91] Minimum Smallest value in the window [45,46,57,69,72,76,82,90,91] Maximun Largest value in the window [45,46,57,69,72,76,82,90,91] Energy Average sum of squares [49,50,71,75,76,78,82,91] Signal Magnitude Area [47,50,53,78,80,…”

“…This underlines the increasing significance and research interest in HAR for P+L. The application covers a wide range of sectors, such as manufacturing and assembling [58,86], warehousing [72,83,85], construction [90] and maintenance [11,14]. Warehousing, in particular order picking, is the only sector in logistics.…”

“…In contrast to the aforementioned works, the authors of [63,64,90] normalised the extracted features before the training stage. For example, the authors of [90] normalised the extracted features to the range [0, 1].…”

“…Frequency Spectral centroid Centroid of a given spectrum [90] Frequency Range Power Sum of absolute amplitude of the signal [90] Cepstral coefficients Mel-Frequency Cepstral Coefficients [29] Correlation [49] maxFreqInd Largest Frequency Component [76] MeanFreq Frequency Signal Weighted Average [76] Energy Band Spectral Energy of a Frequency Band [a, b]…”