Patent ID: 6346933
Filing Date: 2002-02-12
Classification: G06F,G06K

Abstract:
A display presentation control system suitable for use in providing control to a projection display apparatus including a display computer for generating initial and successive electronic images, a computer-controlled image projector, a projection screen, and a laser pointer operating in pulsing and continuous-radiation modes, the projector for receiving the initial electronic image for projection onto the projection screen as an initial presentation image, and the laser pointer for providing the control when used by a presenter to emit a laser spot onto the projection screen and project a spatial pattern on the initial presentation image, said control system comprising:an electronic camera directed at the initial presentation image and producing a sequence of acquired images thereof, each said acquired image comprising image elements; and, a control module responsive to said acquired images, said control module comprising: means for locating the laser spot in said acquired images; means for assigning positional coordinates to each said located laser spot so as to produce a sequence of positional coordinates (xi,yi) corresponding to sequential positions of the laser spot in the initial presentation image; means for analyzing said sequence of positional coordinates so as to capture a gesture spatial pattern formed by said sequence of positional coordinates; means for matching said captured gesture spatial pattern to one of a set of pre-established gesture spatial patterns; means for selecting a display command, said selected display command correlated to said matched pre-established gesture spatial pattern; and means for generating a subsequent electronic image in response to said selected display command, said subsequent electronic image transmitted to the image projector for projection onto the projection screen as a subsequent presentation image.