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AssigneeLG Electronics Inc.
InventorsWoo Jin Song, Kyu Young Hwang, Hyun Chool Shin, Chung Hee Lee, Jong Hwa Kim
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An apparatus and a method for correcting a distorted image is capable of correcting an optical distortion of an image and misconvergence by prewarping an inputted image without using a convergence yoke, and an image displayer using the same. The apparatus for correcting an image distortion for an image displayer in which an image signal is inputted to display an image on a screen and an image distortion is corrected, includes: a reference image generator for generating a predetermined reference image; a camera for inputting the reference image and photographing an image outputted on the screen; and a distortion information extracting unit for comparing the photographed image outputted from the camera and the reference image outputted from the reference image generator, and generating distortion correction information to correct a distortion of the photographed image in case that the image has been distorted.
1 An apparatus for correcting an image distortion for an image displayer in which an image signal is inputted to display an image on a screen and an image distortion is corrected, comprising:
2 The apparatus according to claim 1, wherein the reference image is a grid color image.
The apparatus according to claim 1, wherein the distortion includes a keystone distortion or a pincushion distortion.
The apparatus according to claim 1, wherein the distortion correction information extracting unit includes a distortion correcting memory for storing the distortion correction information.
The apparatus according to claim 1, wherein the image displayer includes a memory for storing the distortion correction information.
The apparatus according to claim 1 is portable.
The apparatus according to claim 1, wherein the distortion correction information is distortion parameters or pixel mapping information.
A method for correcting an image distortion comprising the steps of
13 The method according to claim 12, wherein the position of the pixel is a coordinate.
16 The method according to claim 8, wherein the step of correcting a distorted image comprising:
The method according to claim 16, wherein, in the mathematically modeling step, the distorted image is geometrically warped.
18 The method according to claim 17, wherein the image warping includes transformation of rotation, translation and scaling.
An image displayer comprising:
22 The image displayer according to claim 21, wherein the prewarping unit comprising:
25 The image displayer according to claim 20, wherein the image processor outputs a vertical or a horizontal synchronous signal from the image signal.
The image displayer according to claim 25, further comprising a vertical/horizontal deflection unit for receiving a vertical or a horizontal synchronous signal and outputting a vertical or a horizontal control signal.
A method for correcting a distorted image comprising the steps of:
31 The method according to claim 29, wherein the distortion information is to correct a pincushion distortion and a keystone distortion of an image displayer.
The method according to claim 31, wherein the step of processing a prewarped image comprising the sub-steps of:
Dependencies are inferred from the claim text.