In an image processing device and image processing method in which first image data consisting of a plurality of color data and constituting image information for each pixel are input, and second image data consisting of a plurality of color data are calculated and output, after color conversion of the first image data, dither processing is applied to produce the second image data. Correspondingly, the receiver comprises a Viterbi decoder followed by a block decoder. The estimating unit estimates status information of the one or the plurality of particle beams by executing a mathematical method according to the one or the plurality of detector signals.