A lookup table configuration method for video format conversion and a scan format converter using lookup table

摘要

end. TECHNICAL FIELD The present invention relates to a scan format converter using bi-sigmoid interpolation.;I. The present invention provides a scan format converter for converting a video format using lookup tables and a method for constructing lookup tables so that a video format can be up / down converted using bi-sigmoid interpolation have.;All. The point of the solution of the invention is that the variables necessary for interpolation of the bi-sigmoid for the pixel points to be converted$n$_One, n₂, X, Y) Is calculated in advance to compose a lookup table, and a sigmoid function graph corresponding to a level difference between two pixel points is obtained, and a level value at a displacement value for distinguishing the two pixel points is obtained in advance and tabulated. Accordingly, the level value of the two sigmoid interpolation is obtained with respect to the x-axis (or the y-axis) of the four pixel points input from the external device, and the obtained level values are subjected to the sigmoid The final bi-sigmoid interpolation value can be obtained by obtaining the interpolated level value.;la. An important application of the invention is that it can be used in converters for converting video formats.