An apparatus for interpolating an image from a plural number of image values for a display having an array of display pixels more numerous than the number of images. The apparatus includes a generating device, a designating device, and first and second applying devices. The generating device generates image signals based on image data representing an image of a living body and for designating an array of pixels based on the image signals. The designating devices designates as primary image pixels a limited plurality of display pixels within the array of pixels. The first applying device applies the image values each to a respective one or more of the primary image pixels. The second applying device applies the image values to the remaining display pixels of the array according to an allocation pattern associating each remaining display pixels with a particular one of the primary image pixels, such that the distribution of display pixels associated with each primary image pixel is, at a distance from the respective primary image pixel, increasingly sporadic with increasing distance from the respective primary image pixel.