Patent ID: 9165358
Filing Date: 2015-10-20
Classification: A61B,G06T

Abstract:
1. An image processing apparatus that identifies an inclination of a periodic pattern included in an image based on spatial frequency components corresponding to the periodic pattern, and the spatial frequency components having been detected with respect to a plurality of directions, the apparatus comprising: a subject component removal unit configured to obtain a subject component removed signal from an image signal representing the image by performing one-dimensional filtering processing using a subject component removal filter that removes low spatial frequency components including a subject component of the image, with respect to one of a first direction and a second direction that has a clearer peak among peaks of the spatial frequency spectra which are candidates of spatial frequencies corresponding to the periodic pattern in the first direction and the second direction, the second direction being different from the first direction; and a periodic pattern detection unit configured to detect, with respect to both of the first direction and the second direction, the frequency components corresponding to the periodic pattern in the subject component removed signal, wherein the subject component removal filter is a high-pass filter or a band-pass filter, which passes through the spatial frequency components corresponding to the clearer peak, with respect to the direction which has the clearer peak of the spatial frequency spectrum.