Patent ID: 7995866
Filing Date: 2011-08-09
Classification: G06K,G06T

Abstract:
1. A rotation angle detection apparatus which detects a rotation angle with respect to a reference disposition position of an object included in a detection subject image, comprising: a plurality of kinds of pixel extraction pattern for extracting a plurality of pixels which detect an image feature amount from pixels configuring the detection subject image; a feature amount detector which detects, for each pixel extraction pattern, an image feature amount of the extracted plurality of pixels; a likelihood memory which stores a likelihood of the rotation angle, correlated in advance to the image feature amount, for each pixel extraction pattern; a rotation angle determiner which determines a rotation angle which has a greatest likelihood, based on the image feature amount corresponding to each pixel extraction pattern and on the likelihood, as the rotation angle of the object; and an integral image generator which, integrating luminance values of all pixels within a rectangle having as diametrically opposed apices a predetermined reference position pixel and a subject pixel, and making them an integrated pixel value corresponding to the subject pixel, calculates an integrated pixel value corresponding to all the pixels configuring the detection subject image, and generates an integral image; wherein the feature amount detector detects the image feature amount based on the integral image.