Abstract: The input device for controlling an apparatus includes: a display device for displaying an image represented by a plurality of dots; a touch panel disposed over the display face of the display device for outputting information of a position where the panel is operated in accordance with the displayed image on the display device; a command content determining device for determining the content of the command selected, based on the relationship between the positional information output from the touch panel and the image displayed on the display device, wherein the image displayed on the display device includes an external outline of the apparatus having the input device; and a switching device for switching the display on the display device, into the display frame for setting the operation of a unit corresponding to the operated part of the external outline of the apparatus when part of the external outline of the apparatus displayed on the display portion is operated through the touch panel.

Abstract: A document size detection apparatus having a plurality of sensor portions including light emitting devices and photodetector devices disposed in the vicinity of an original table for detecting the size of a document such as an original mounted on the original table is disclosed. This apparatus uses reflected light or transmitted light, a comparator for comparing the output level of the sensor portion with a reference level, and decision means for deciding the document size depending on the output signal of the comparator.