Patent ID: 6701024
Filing Date: 2004-03-02
Classification: G06T,H04N

Abstract:
An image processing apparatus for calculating a new luminance value of a central pixel to adjust spatial frequency characteristic of an input image, comprising:a plurality of subfilters which are arranged in parallel with each other for a plurality of pixel groups each made up of at least one pixel in a submatrix, multiply sums of luminance values of pixels included in corresponding pixel groups by predetermined coefficients corresponding to desired spatial frequency adjustment filter characteristics, and output products for each submatrix consisting of MÃ—M (wherein M is an odd number of not less than 3) pixels centered on pixels constituting an input image for a two-dimensional input image comprising many pixels that are arrayed in a matrix and that represent luminance values at positions; totalization means for totaling outputs from said subfilters and for outputting a sum as an adjustment amount of the spatial frequency characteristics; and addition means for adding the adjustment amount obtained by said totalization means to an original luminance value of the central pixel and outputting a sum as a new luminance value of the central pixel for each matrix, wherein said subfilters are operative to sequentially receive pixel blocks of the input image, said pixel block each consisting of M pixels aligned in a common column in a matrix of exactly M parallel columns, said subfilters being further operative to sequentially multiply sums of luminance values included in corresponding pixel groups by predetermined coefficient corresponding to desired spatial frequency adjustment filter characteristic using luminance values of pixels included in a submatrix made up of said M successively received pixel blocks, and wherein said subfilters are operative to output resultant multiplication products.