| 摘要 |
An original image signal, which represents an original image and is made up of a series of original image signal components Yij, is obtained. Corresponding interpolation coefficients Cij and Bij, which are set for each of the original image signal components Yij, in an interpolating function alpha represented by Formula (1) for obtaining an interpolation image having a relatively high sharpness and an interpolating function beta represented by Formula (2) for obtaining an interpolation image having a relatively low sharpness, are linearly combined each other according to Formula (3) including a weighting coefficient w, thereby obtaining a new interpolation coefficient Aij. An interpolating operation is carried out on the original image signal components Yij by using an interpolating function h represented by Formula (4), and an interpolation image signal made up of a series of image signal components which occur at intervals different from those of the original image signal components Yij is obtained. alpha = SIGMA CijxYij(1) beta = SIGMA BijxYij(2) Aij=(1-w)xCij+wxBij(3) h= SIGMA AijxYij(4) A density vector at each interpolation picture element on the image is calculated, and the weighting coefficient w is corrected to be smaller as the density vector becomes larger.
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