System and process for image rescaling with edge adaptive phase control in interpolation process

A video image processing system comprising:

• an input image data module configured to receive and make input image data available for further processing;
• a local image feature analysis module operably coupled with the input image data module, operable to receive the input image data and analyze the local features of the input image data, wherein the local features include gradient magnitude, edge direction and corners;
• an edge contour detection in sub-pixel accuracy module operably coupled with the local image feature analysis module, operable to receive the information of gradient magnitude and edge direction to detect the edge contour in sub-pixel accuracy;
• a local edge distance estimation module operably coupled with the edge contour detection in sub-pixel accuracy module, operable to receive the detected edge contour information and estimating the local edge distance from a to-be-interpolated pixel to the local edge contour;
• a pair of edge directional filters operably coupled with the input image data module, operable to filter the input image data before performing interpolation process;
• an adaptive horizontal phase control module and an adaptive vertical phase control module operably coupled with the local edge distance estimation module, operable to modify the phase value adaptive to the local edge distance;
• a horizontal interpolation module operably coupled with one of the edge directional filters and adaptive horizontal phase control module, operable to rescale the input image data in horizontal interpolation;
• and
• a vertical interpolation module operably coupled with one of the edge directional filters and adaptive vertical phase control module, operable to rescale the horizontally interpolated image data in vertical interpolation, wherein the video image processing system is operable to interpolate the input image data, resulting in an output image with sharp and jaggedness-free edges.