Unlock instant, AI-driven research and patent intelligence for your innovation.

Projector and projection image correction method thereof

A technology for projecting images and projectors, which is applied in the field of projectors and the correction of projected images thereof

Inactive Publication Date: 2008-02-20
CASIO COMPUTER CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional projectors have to do two keystone corrections because if the zoom magnification is changed, the first keystone correction based on the tilt angle is invalidated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Projector and projection image correction method thereof
  • Projector and projection image correction method thereof
  • Projector and projection image correction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] A projector according to an embodiment of the present invention will now be described with reference to the drawings.

[0027] (first embodiment)

[0028] FIG. 1 illustrates the structure of a projector according to a first embodiment of the present invention.

[0029] A projector 1 according to the first embodiment includes a scaler 11 , an inclination detection sensor 12 , a transformation coefficient storage unit 13 , a keystone correction unit 14 , a projection light conversion device 15 , and an optical mechanism unit 16 .

[0030] The scaler 11 adjusts the resolution of an input image signal.

[0031] The inclination detection sensor 12 detects the inclination angle θH and the inclination angle θV of the ideal screen through which the optical axis of the actual screen passes vertically with respect to the projector 1, wherein the inclination angle θH is the angle of inclination relative to the ideal screen in the horizontal direction, and the inclination angle θV...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A transformation coefficient storing unit (13) has correction tables (21, 22, 23, 24) which are generated based on classification of zooming magnification in a manner of arithmetic progression. An optical mechanism unit (16) supplies information on a zooming magnification Z to a switch control unit (26) of the transformation coefficient storing unit (13). The switch control unit (26) controls a table selection unit (25) to select any from the correction tables (21, 22, 23, 24) based on the zooming magnification Z. The transformation coefficient storing unit (13) selects a coefficient set from the selected correction table based on inclination angles thetaH and thetaV and supplies the selected coefficient set to a trapezoidal correction unit (14). The trapezoidal correction unit (14) performs trapezoidal correction based on the supplied coefficient set.

Description

field of invention [0001] The invention relates to a projector and a projection image correction method thereof. technical background [0002] A projector (projection device) is a device used to display images on a screen. If the projector's optical axis is tilted relative to the screen surface, the image displayed on the screen will be distorted. In order to avoid this phenomenon, as disclosed in Unexamined Japanese Patent Application KOKAI Publication No. 2000-122617 (pages 4 to 7, FIGS. 1 and 2), a projection with a keystone correction unit is proposed in which the keystone correction unit corrects the distortion of the projected image according to the inclination of the projector's optical axis relative to the screen surface, so that an undistorted image is displayed on the screen despite this inclination. [0003] Some projectors have zoom mechanisms. When the zoom magnification is set, the keystone correction unit of the projector with the zoom mechanism performs ke...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/74G03B21/00G03B21/14H04N9/31H04N17/00
CPCH04N9/3197H04N9/3185H04N5/74G03B21/14G03B21/00
Inventor 井上秀昭
Owner CASIO COMPUTER CO LTD