System object: vision.CascadeObjectDetector
Detect objects using the Viola-Jones algorithm
BBOX = step(DETECTOR,I)
BBOX = step(DETECTOR,I) returns BBOX, an M-by-4 matrix defining M bounding boxes containing the detected objects. This method performs multi-scale object detection on the input image, I.
Each row of the output matrix, BBOX, contains a four-element vector, [x y width height], that specifies in pixels, the upper left corner and size of a bounding box. The input image I, must be a grayscale or truecolor (RGB) image.
Note: The object performs an initialization the first time the step method is executed. This initialization locks nontunable properties and input specifications, such as dimensions, complexity, and data type of the input data. If you change a nontunable property or an input specification, the System object™ issues an error. To change nontunable properties or inputs, you must first call the release method to unlock the object.