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Image processing method for correcting distortion in cathode ray tube

A cathode ray tube and image technology, applied in image communication, television, electrical components, etc., can solve the problem of not being able to correctly display images with strong contrast

Inactive Publication Date: 2004-05-19
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This adjustment makes it possible to obtain a good TV picture, but when the TV is used as a monitor, this adjustment does not correctly display a high-contrast picture like a computer screen

Method used

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  • Image processing method for correcting distortion in cathode ray tube
  • Image processing method for correcting distortion in cathode ray tube
  • Image processing method for correcting distortion in cathode ray tube

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Embodiment Construction

[0024] The first step in the image processing method of the present invention is to describe the defects of the cathode ray tube. This step is performed in the final stages of a factory used to manufacture cathode ray tube televisions or monitors.

[0025] When the light intensity of the image reaches a certain average value, the distortion as described above occurs, and the appearance of this distortion depends on whether the light intensity of the current image is average or high. When the light intensity of the current image is normal, the current image expands along two directions (X and Y directions) of the image and affects the entire image. This distortion is the global magnification. The magnification factor varies linearly as a function of the light intensity of the current image and of the images preceding the current image in the sequence to be displayed.

[0026] can affect the current image I n A global zoom-in simulation for this current image I n light inten...

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Abstract

The invention relates to a method of processing video images which is intended to correct the distortions created by the instability of the high voltage circuit of the cathode ray tube display device during the displaying of the images. It is more particularly intended for correcting the global zoom and the local zoom affecting the images displayed by the cathode ray tube device.

Description

technical field [0001] The invention relates to an image processing method for correcting distortions in a cathode ray tube. More particularly, the invention relates to distortions associated with the problem of regulating high voltages. Background technique [0002] In the design of current cathode ray tube televisions, certain deficiencies are overlooked due to the difficulty in perceiving them when displaying video images. This is a residual defect in the stability of the TV's high voltage electronics. When a TV tries to display images that contain straight lines, such as those of the information technology type, the defect alters the appearance of those lines, making them look distorted on the screen. [0003] The occurrence of this defect depends on the light intensity of the displayed image. The resulting distortion takes two forms, depending on whether the light intensity of the image is fair or high. Here, the light intensity of the image represents the sum of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N3/23H04N3/223
CPCH04N3/223H04N3/23
Inventor 迪迪埃·杜瓦扬蒂埃里·博雷尔劳伦特·布隆德埃贝尔·赫尔兹曼塞尔日·珀蒂弗朗斯·迪耶泰勒达尼埃尔·里韦罗
Owner THOMSON LICENSING SA