Fig. 7
From: An automatic system for recognizing fly courtship patterns via an image processing method
Attempted copulation was determined by the eccentricity of the male torso. A A frame in which the male does not bend his body is assigned as a standard figure. The standard value is defined as 0.9 times the eccentricity of a male’s torso. B, C The eccentricity of the torso is less than the standard value when a male bends his abdomen, whether the torsos are connected (B) or not connected (C). D If the male does not try to copulate with the female, the eccentricity of his torso will be greater than the standard value