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Table 2 Detected head joint points for classification of head orientation

From: An intelligent shopping support robot: understanding shopping behavior from 2D skeleton data using GRU network

Head orientationsDetected head joints
\(0^{\circ }\)[0,14,15,16,17]
\(45^{\circ }\)[0,14,15,16]
\(90^{\circ }\)[0,14,16]
\(135^{\circ }\)[14,16]
\(180^{\circ }\)[No points detected]
\(225^{\circ }\)[15,17]
\(270^{\circ }\)[0,15,17]
\(315^{\circ }\)[0,14,15,17]