Patent ID: 7474354
Filing Date: 2009-01-06
Classification: G06T,H04N

Abstract:
1. A picture angle detection apparatus for detecting an angle of a picture related to a pixel to be interpolated in each interpolation scanning line between scanning lines based on an input video signal, comprising: a binary pattern generator that binarizes said input video signal in a predetermined detection region including a plurality of scanning lines and said pixel to be interpolated to generate a binary pattern; a reference pattern generator that generates binary pictures having different directions as a plurality of reference patterns; a comparator that compares the binary pattern generated by said binary pattern generator with each of the plurality of reference patterns generated by said reference pattern generator to detect the angle of the picture related to said pixel to be interpolated based on a comparison result; and a shape detector that detects the shape of the picture based on a combination of the angle of the picture detected by said comparator related to said pixel to be interpolated and angles of the picture detected in upper and lower interpolation scanning lines, and when the angle of the picture detected by said comparator related to said pixel to be interpolated is between the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line, and the absolute value of the angle of the picture detected in the upper interpolation scanning line is larger than the absolute value of the angle of the picture detected in the lower interpolation scanning line, said shape detector outputs a shape detection signal indicating that the shape of the picture is convex toward the lower right, when the angle of the picture detected related to said pixel to be interpolated, and the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line are positive values, and said shape detector outputs a shape detection signal indicating that the shape of the picture is convex toward the lower left, when the angle of the picture detected related to said pixel to be interpolated, and the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line are negative values, and when the angle of the picture detected by said comparator related to said pixel to be interpolated is between the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line, and the absolute value of the angle of the picture detected in the upper interpolation scanning line is smaller than the absolute value of the angle of the picture detected in the lower interpolation scanning line, said shape detector outputs a shape detection signal indicating that the shape of the picture is convex toward the upper left, when the angle of the picture detected related to said pixel to be interpolated, and the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line are positive values, and said shape detector outputs a shape detection signal indicating that the shape of the picture is convex toward the upper right, when the angle of the picture detected related to said pixel to be interpolated, and the angle of the picture detected in the upper interpolation scanning line and the angle of the picture detected in the lower interpolation scanning line are negative values.