Abstract: An interactive display system, an image capturing apparatus, an interactive display method, and an image capturing method are provided. An indicating unit of the image capturing apparatus emits an indicating light beam to form an indicating pattern on an image provided by a display unit, and the indicating pattern is configured to assist at least one of a user and a processing unit in determining an operating range.

Abstract: A projection system includes a pointing sensing apparatus and a projection apparatus. The pointing sensing apparatus senses at least one of a plurality of instruction signals, and outputs a sensing signal accordingly. The projection apparatus displays a pointing pattern according to the sensing signal. The projection apparatus includes a control module, a first storage module and a second storage module coupled to the control module. The control module receives a plurality of image signals of different formats and generates a plurality of shrink-image data according to the image signals, respectively. The first storage module stores one of the image signals. The second storage module stores the shrink-image data. The projection apparatus displays a normal display image according to contents stored in the first storage module or displays a shrink array image according to contents stored in the second storage module in response to a selecting signal.