Patent ID: 6993208
Filing Date: 2006-01-31
Classification: G06T

Abstract:
1. An image processing apparatus for scaling input image data, and outputting the scaled image data, comprising: means for designating a scale phase information determination means for determining phase information, which indicates distances between a position of a pixel of interest after scaling, and neighboring pixels of an original image, for each pixel of interest after scaling; coefficient arithmetic means for calculating a filter coefficient in a filter process in accordance with the scale, the phase information for each pixel of interest, and a phase information control parameter (low-pass coefficient) used to control frequency characteristics of a filter; and filter processing means for executing the filter process of input image data by a convolution operation on the basis of the. calculated filter coefficient, and outputting multi-valued image data, wherein said coefficient arithmetic means calculates the distances between the pixels of the original image and the position of the pixel of interest after scaling on the original image, which are used in the convolution operation, as distances projected in main scan and sub-scan directions on the basis of the original image pixel position and the phase information, said coefficient arithmetic means has one each of main scan and sub-scan phase information control parameters (low-pass coefficients) used to control the frequency characteristics of the filter, and said coefficient arithmetic means calculates filter coefficients in the main scan and sub-scan directions by a bi-cubic method using the distances changed according to the low-pass coefficients as parameters.