Direction of Groove Detection for Wear Image of Four-Ball Friction Test Based on Gray Difference of Inclination Angle

<div>Wear image and its graying. (a) True RGB color wear image <i>F</i>. (b) Grayscale wear image <i>f</i>.</div>

Advances in Materials Science and Engineering

Figure 4: Direction of Groove Detection for Wear Image of Four-Ball Friction Test Based on Gray Difference of Inclination Angle 