Patent ID: 6298157
Filing Date: 2001-10-02
Classification: G06T,H04N

Abstract:
An apparatus for finding an image embedded in a larger image, the apparatus comprising:edge detecting means for detecting, within the larger image, an edge of the embedded image, the edge including one or more edge points;edge curve finding means for finding an edge curve from the detected edge of the embedded image, wherein the edge curve finding means compares an intensity value of an edge point of the detected edge to a threshold intensity level and designates edge points having an intensity value exceeding the threshold intensity level as being included in the edge curve, the edge curve defining visible perimeter portions of the embedded image and excluding substantially all interior portions of the embedded image;rotation angle calculating means for calculating a rotation angle of the embedded image from the edge curve; andline segment calculating means for calculating from the edge curve a location and orientation of one or more line segments of a side of a rectangle bounding the embedded image in the larger image.