US 6,305,805 B1 · System, method and software for correcting keystoning of a projected image

Abstract

A presentation system, method and software for displaying an image on a screen and correcting image keystoning caused by a projection lens of a projector not being centered on the screen. The presentation system comprises a computer including a processor and memory and a projector interfaced with the computer to project an image A stored in the computer's memory. A program of instructions stored in the computer's memory includes instructions configured to correct keystoning of the image projected by the projector without centering the projector on the screen. The program provides a software solution to avoid hardware modifications to the computer or projector to correct keystoning. The program also includes instructions configured to input right/left and upward/downward projection angles to correct keystoning caused by some combination of the angles being greater than or less than 90°.

Claims18

Dependent claims

A presentation system comprising:

at least one processor;
memory operably associated with said processor;
at least one output port operably associated with said processor and said memory and configured to output an image storable in said memory, the image comprising a number of pixels arranged in a number of rows and a number of columns;
and
a program of instructions configured to be executed by said processor and stored in said memory, said program including instructions for obtaining a number p of pixels not rendered in at least one of a given row and a given column of the image output by said output port from at least one of a corresponding row and a corresponding column of the image stored in memory and further including selecting p pixels from at least one of the given row and the given column of the image stored in memory not to be rendered in the at least one of the corresponding row and the corresponding column of the image output by said output port.

2 more elements

A method for correcting keystoning of an image projected by a presentation system including at least one processor, memory operably associated with the processor and configured to store the image, and at least one output port operably associated with the processor and the memory and configured to output the image, the image comprising a number of pixels arranged in a number of rows and a number of columns, said method comprising the steps of:

maintaining the image in the memory;
and
maintaining a program of instructions configured to be executed by the processor and stored in the memory, said program including instruction for obtaining a number p of pixels not rendered in at least one of a given row and a given column of the image output by said output port from at least one of a corresponding row and a corresponding column of the image stored in memory and further including selecting p pixels from at least one of the row and the column of the image stored in memory not to be rendered in at least one of the corresponding row and the corresponding column of the image output by said output port.

Dependencies are inferred from the claim text.

System, method and software for correcting keystoning of a projected image

Life of this patent

System, method and software for correcting keystoning of a projected image

Life of this patent

Abstract

Claims18