Facial detection
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OpenCV is a library of computer vision developed by Intel, we can easily detect faces using this library for example.
yoshimasa niwa - Using OpenCV on iPhone
FAST Corner Detection -- Edward Rosten
The FAST binary accepts an image as input and output image with corners drawn on or a list of corner locations.
FREE Face Recognition API, Face Recognition Software Apps for the masses – face.com
Face.com is a technology company with the best-in-class face recognition software. We offer a platform for developers and publishers to automatically detect and recognize faces in photos using a robust, free, REST API This API allows third-party developers to create their own original apps that leverage our face recognition technology, algorithms, and database of tagged faces.Comparison of the OpenCV’s feature detection algorithms « Computer Vision Talks
“In computer vision and image processing the concept of feature detection refers to methods that aim at computing abstractions of image information and making local decisions at every image point whether there is an image feature of a given type at that point or not. The resulting features will be subsets of the image domain, often in the form of isolated points, continuous curves or connected regions.” OpenCV is free open-source library intended for use in image processing, computer vision and machine learning areas.