Patent ID: 7450784

Claim:
An image resolution converting device for converting an original image into an image of a predetermined resolution, the image resolution converting device comprising: a pixel value storage section for storing the pixel values of the pixels included in the original image; a region determining section for successively determining regions, disposed newly generated pixels in accordance with a raster-scanned disposition order of the newly generated pixels based on a resolution conversion ratio corresponding to the predetermined resolution; a pixel value read-out controlling section for generating output-control signals serving for outputting the pixel values of the pixels, included in the pixel groups corresponding to the determined regions from the pixel value storage section in accordance with the determined regions; and an interpolation-calculating section for calculating interpolations of pixel values of the newly generated pixels in accordance with the interpolated pixel values included in the pixel groups, the outputted pixel values corresponding to the predetermined resolution conversion ratio; wherein said interpolation-calculating section further comprises: an interpolation coefficient storage section storing groups of interpolation coefficients, to be multiplied by the pixel values included in the pixel groups, in a plurality of addresses, under the conditions that: the resolution conversion ratio is indicated by a fractional expression having an integer numerator and an integer denominator; a total of the addresses is indicated by the integer of the numerator; and each one of the groups of the interpolation coefficients is stored in each group of the pixels; an interpolation coefficient read-out controlling section generating signals for designating the addresses so as to be synchronous with the output-control signals; and a pixel-value-calculating section calculating the pixel values of the newly generated pixels in accordance with the groups of the interpolation coefficients, outputted from the interpolation coefficient storage section in accordance with the signals for designating the addresses, and the pixel values included in the pixel group outputted from the pixel value storage section.