A new Apple patent (number 8295610) at the U.S. Patent & Trademark Office shows that Apple is working on ways to beef up face detection in its iOS and OS X products.
The patent is for feature scaling for face detection. Per the patent, a feature used in face detection can be applied to an image portion and can be scaled to fit differently sized image areas. If a feature is positioned with respect to an image area such that a vertex of the feature is aligned with a non-integer pixel location, at least one dimension of the filter can be rounded. A dimension to be rounded further can correspond to a directional component of the feature.
For instance, contrast regions within the feature can be arranged horizontally, such that the vertical dimension represents a directional component. A rounding rule associated with the feature can be used in rounding a dimension corresponding to a directional component, such that a size ratio between the contrast regions is...| Read more »