Patent ID: 6091426
Filing Date: 2000-07-18
Classification: G06T

Abstract:
A video scaling circuit residing on a single semiconductor substrate comprising, in combination:horizontal scaling means for scaling video pixel data in horizontal order to produce horizontally-scaled pixel data; andvertical scaling means comprising:first and second multiplication means for multiplying said horizontally-scaled pixel data with a series of predetermined coefficients to produce weighted horizontally-scaled pixel data;first and second addition means each connected to the output of the corresponding multiplication means for adding said weighted, horizontally-scaled pixel data;first and second storage means each connected to the output of the corresponding addition means to store a sum of successive rows of said weighted, horizontally-scaled pixel data, the second storage means being time-shifted in operation from the first storage means by a predetermined amount of time;selection means connected to the outputs of said first and second storage means to alternatively select between the respective outputs of said first and second storage means; andnormalization means connected to the output of said selection means to divide said weighted, horizontally-scaled pixel data by a value equal to the sum of said predetermined coefficients.