Feature Aligned Interpolation Using Colour Components

摘要

A method of pixel interpolation in which a two-dimensional digital filter is arranged so as to interpolate an output pixel from a two-dimensional array of colour input pixels by aligning a filtering operation with a detected direction of an image feature at a pixel position to be interpolated. The invention comprises detecting image activity within respective colour components of a group of input pixels around the pixel position to be interpolated, generating monochromatic test pixels by combining the colour components of input pixels in relative proportions dependent upon the detected image activities and detecting the direction of an image feature in a group of the monochromatic test pixels around the pixel position to be interpolated. The output pixel is then interpolated using the two-dimensional filter, according to the detected image feature direction.