Patent ID: 8373697

Claim:
An image processing apparatus comprising: filter-coefficient storing means for storing filter coefficients respectively associated with spatial frequencies, which are numbers of strips displayed per unit angle with respect to an angle of field of a display apparatus; viewing-condition determining means for determining, as viewing conditions, a viewing distance between a viewer and the display apparatus and pixel density of the display apparatus from screen information concerning the viewing conditions acquired from the display apparatus through communication between the image processing apparatus and the display apparatus established by the image processing apparatus via an interface of the image processing apparatus, wherein, when a determination is the screen information is not acquired by the communication between the image processing apparatus and the display apparatus, the viewing conditions are determined by the view-condition determining means based on stored information corresponding to the screen information; filter-coefficient setting means for setting a filter coefficient selected on the basis of a spatial frequency calculated from the viewing conditions among the stored filter coefficients; and gradation modulating means including quantizing means for quantizing a pixel value in a predetermined coordinate position in an image signal and outputting the pixel value as a quantized pixel value in the predetermined coordinate position, the gradation modulating means gradation-modulating the image signal by multiply-accumulating a set filter coefficient with respect to quantization errors caused by the quantizing means to feed back the quantization errors to an input side of the quantizing means.