In an image encoder, a quantizer makes a quantization-step size set for each of low-frequency subbands whose resolution level belongs to a predetermined resolution level coincide with a quantization-step size set for each subband to encode an original image having the resolution level as it is. The system comprises one or more translucent elements associated with the keyboard and one or more light-conducting fibers for conducting light from the backlight of the backlit display to the one or more translucent elements associated with the keyboard. Further the method includes identifying a first image slice in the at least one other image data set corresponding to the first image data set. The switch contact at the other end has a rear contact section formed in the card thickness-parallel direction and defines a second switch contact in confronting relation with the first contact. where switching elements and storage capacitors are located, are converted to associated dots by adding an electrode that can be electrically biased.