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Projected image correction method and projector

A projector and image technology, applied in image communication, image data processing, graphics and image conversion, etc., can solve problems such as limiting the amount of correction

Inactive Publication Date: 2004-08-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it is necessary to store the data of the number of lines corresponding to the inclination angle in the horizontal keystone correction, the correction amount is limited by the capacity of the buffer (see FIG. 7 described later).

Method used

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  • Projected image correction method and projector
  • Projected image correction method and projector
  • Projected image correction method and projector

Examples

Experimental program
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Embodiment Construction

[0030] Embodiment 1

[0031] FIG. 1 is a block diagram showing the configuration of a projector in Embodiment 1 of the present invention. This projector shows an example when all the ICs from the input signal of a video tape recorder etc. to the final liquid crystal display screen are subdivided, and it is equipped with a video decoder 10, an A / D converter 11, a scan converter 12, Buffer 13 , signal interpolation device 14 , keystone correction device 15 , buffer 16 , signal interpolation device 17 , LCD driver 18 , LCD 20 and CPU 21 . In addition, a light source 22 and a projection lens 23 are also provided. In addition, in FIG. 1, only the circuit configuration necessary for explaining the first embodiment is shown, and other circuit configurations are omitted.

[0032] The output of the video decoder 10 is connected to a scan converter 12, and a video signal (composite signal, S signal, etc.) from a video tape recorder is input, decoded, digitized, and output to the scan ...

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PUM

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Abstract

The present invention aims to execute a projected image correction method and a projector that can execute keystone correction of larger amount without modifying or replacing a keystone correction device. A projector according to the invention includes a signal scaling down device 14 that scales down image signals that are input, a keystone correction device 15 that executes keystone correction for the scaled down image signals, a buffer 16 that temporarily stores the image signals for keystone correction, and a signal interpolation device 17 that interpolates the corrected image signals.

Description

technical field [0001] The invention relates to an image correction method of a projector and the projector, in particular to correction of keystone distortion. Background technique [0002] The projector enlarges, for example, a display screen output from an information processing device such as a personal computer, and displays the enlarged display on a projection surface such as a screen. In such a case, if an image is projected in a state where the central direction of image projection is inclined with respect to the radial direction of the screen surface, the image will be distorted on the screen surface. For example, when a rectangular image of the projector is projected from a direction shifted upward or downward relative to the screen, a trapezoidal image is displayed on the screen (see FIG. 5 and FIG. 6 described later). [0003] Therefore, there is a method of adjusting the image that forms an image different from the original graphics so that the display is the s...

Claims

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Application Information

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IPC IPC(8): G02F1/133G03B21/00G06T3/00G06T3/40G09G3/20G09G3/36H04N5/72H04N5/74
CPCH04N5/74G06T3/4007H04N5/7441A61H23/0218A61H23/006A61N5/0625A61N2005/066A61H2201/0153A61H2201/0157
Inventor 梨子田行浩长野干神谷靖孝武居彻吉国典宏
Owner SEIKO EPSON CORP