2 Hybrid interpolator of 2 dimensions for edge enhancement and method thereof

摘要

Disclosed are a two-dimensional mixed interpolation apparatus and method for edge enhancement. The two-dimensional mixed interpolation apparatus according to the present invention detects edge information between pixels of an image signal input through an input terminal, transforms the detected edge information according to a predetermined edge pattern, and adjusts a plurality of adjacent pixels around the pixels to be interpolated. Edge detection that obtains a plurality of two-dimensional nonlinear interpolation coefficients according to the modified edge patterns existing between the pixels, and generates an edge signal indicating the presence or absence of an edge between a plurality of pixels around the pixel to be interpolated. And a nonlinear interpolation coefficient generator; A linear interpolation unit for performing linear interpolation by multiplying the vertical and horizontal interpolation coefficients with n * n pixels centered on the pixel to be interpolated; A nonlinear interpolation unit for performing interpolation near an edge by multiplying a plurality of two-dimensional nonlinear interpolation coefficients by neighboring pixels, respectively; And a multiplexer for selectively outputting the interpolated pixels in the linear interpolator or the nonlinear interpolator in response to the edge signal. The two-dimensional mixed interpolation apparatus and method thereof according to the present invention selectively perform linear interpolation or nonlinear interpolation depending on whether a graphic edge exists in the vicinity of a pixel to be interpolated, thereby enlarging an image in an image in which a graphic and a natural image are mixed. It is possible to reproduce the graphic image maintaining the sharpness without deterioration of the graphics edge.