Patent ID: 7924468
Filing Date: 2011-04-12
Classification: G06T,H04N

Abstract:
1. A device for determining whether or not blurring in images has been produced by camera shake, the device comprising: an image data reference module configured to reference image data in which has been recorded, per block unit, coefficients that are obtained when pixel values forming an image in a spatial domain are converted to a frequency domain per block unit composed of a plurality of pixels; a blur level determination module configured to detect whether edges are included per block unit using the coefficients, and determine as a blur level the proportion of edges, among the detected edges, in which the edge width is over a certain threshold; an ellipticity determination module configured to determine coordinates composed of first coefficient values and second coefficient values per block in a coordinate system in which the coordinate axes are first coefficient values representing frequency components in a first direction in the blocks and second coefficient values representing frequency components in a second direction perpendicular to the first direction in the blocks, and calculate an extent of bias in the distribution of the coordinates as the ellipticity; and a camera shake determination module configured to determine whether blurring in the image has been produced by camera shake based on the relationship between the blur level and the ellipticity.