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Projector trapezoidal correction

A technology for projectors and projection parts, which is applied in the direction of using image reproducers of projection devices, parts of color TVs, parts of TV systems, etc., can solve problems such as changes in light sensitivity, reduce individual differences, and achieve high stability. sexual effect

Inactive Publication Date: 2006-10-11
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there is a problem that the amount of received light changes not only due to the inclination of the screen, but also due to individual differences in the projection optical system of the projector, the imaging optical system of the imaging device, or changes over time.

Method used

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Experimental program
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Embodiment Construction

[0061] The implementation forms of the present invention will be described in the following order according to the embodiments.

[0062] A. The basic structure of the projector and the deduction principle of the screen tilt angle;

[0063] B. Correction image generation processing of the first embodiment of the present invention;

[0064] C. the keystone correction process of the first embodiment of the present invention;

[0065] D. Correction image generation processing of the second embodiment of the present invention;

[0066] E. Deformation instance;

[0067] A. The basic structure of the projector and the estimation principle of the screen tilt angle:

[0068] figure 1 It is a block diagram showing the configuration of a liquid crystal projector 10 according to an embodiment of the present invention. This liquid crystal projector 10 includes an optical system 100 for projecting an image on a screen SC, and a control system 200 for controlling projection light. The ...

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Abstract

This present invention relates to projector. Which provides a technology for improving the robust property of correction in a projector for correcting image distortion caused by an inclination of a screen depending on the distribution of the lightness of the screen. The projector disclosed herein corrects distortion of an output image with respect to an input image caused by the inclination between an actual projection screen and a virtual projection screen estimated in advance. A distortion amount of the image caused by the inclination between the virtual projection screen and the actual projection screen depending on an angle of a peak position of the lightness on the actual projection screen on which a correction image is projected when viewed from an image projection section is estimated in this correction. The projector corrects the correction image so that a change amount of the angle caused by a peak position moving amount and when the image projection section views the peak position is closer to the inclination angle of the screen.

Description

technical field [0001] The invention relates to a keystone correction technology of a projector. Background technique [0002] In recent years, projectors for projecting images on a screen have rapidly spread. Since the projector is generally designed on the premise that it is installed facing the screen, if the projector is not installed facing the screen, the image will be distorted. [0003] On the other hand, if the projector is not installed so as to face the screen, not only the image but also the luminance distribution will change. In addition, when the camera is installed in the projector, since the shooting distance is different on the left and right sides of the screen, even according to the inverse square law, the light sensitivity of the camera still changes on the left and right sides of the screen. Such a change in light reception can also be used to estimate the inclination of the screen with respect to the optical axis of the projector. [0004] Patent Doc...

Claims

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Application Information

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IPC IPC(8): H04N5/74H04N9/31H04N5/14
CPCG03B21/00H04N5/74H04N9/3194H04N9/3185H04N3/2335G03B21/005
Inventor 松本守生古井志纪
Owner SEIKO EPSON CORP
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