System for correcting approximate expressions used in geometrical correction of projected images
View Patent ↗A computer calculates the shape of a figure after transformation using an approximate expression previously set for correcting a projected image for distortion associated with the shape of a projection surface of a cylindrical screen (an equation representative of a parabola in this case), a variable for horizontal transformation and a variable for vertical transformation which are entered through a user interface for transforming the approximate expression, and/or a variety of parameters required for transformation of image and optical corrections such as the optical center, linearity, amplitude, and position. A projector scales up or down pixels to produce a transformed image from the calculated figure after transformation for projection onto the cylindrical screen.
1. A projector comprising:
a storage device that stores a predetermined approximate expression for correcting a projected image for distortion;
a calculator that performs a geometrical transformation for said projected image emitted from said projector, in accordance with said predetermined approximate expression; and
a receiver to receive a value for substitution as one of a parameter and a variable into said predetermined approximate expression, wherein said value comprises a value entered by a user using an input device.
2. The projector according to claim 1 , wherein said value entered by said user comprises a numerical value entered through said input device.
3. The projector according to claim 1 , wherein said input device comprises a slide bar through which said user interacts to enter said value.
4. The projector according to claim 3 , wherein said slide bar comprises a slide bar located on one of:
said projector; and
a graphical user interface (GUI) associated with a display device for said projector.
5. The projector according to claim 1 , wherein said input device comprises a graphical user interface (GUI) associated with a display device used for said projector.
6. The projector according to claim 1 , wherein said predetermined approximate expression comprises one of an expression representative of:
a parabola;
a linear equation; and
a trigonometric function.