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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 orientations

Detected 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]