This chapter analyzes a number of vowel harmony systems which have been described or analyzed in terms of aperture (lowering or raising, including complete harmony). This takes us into areas where the literature on vowel harmony discusses cases involving the following binary features: [± high], [± low], [± ATR], and [± RTR]. Raising has been thought of as problematic for unary ‘IUA’ systems as these systems lack a common element for high vowels. This chapter suggests that raising can be attributed to ATR-harmony. The chapter also discusses typological generalizations and analyzes metaphony in Romance languages.
BIT-VO: Visual Odometry at 300 FPS using Binary Features from the Focal Plane
