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Video-frequency picture geometrical distortion correction method and system

A geometric distortion and video image technology, applied in image communication, TV, TV system scanning details, etc., can solve problems that affect the use effect, application restrictions, trapezoidal distortion of displayed images, etc.

Inactive Publication Date: 2009-12-16
KONKA GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of science and technology and economy, display devices have become an indispensable and important part of government offices, educational demonstrations, business activities and even home entertainment. Due to the asymmetry of the optical path design or the limitations of the use conditions, the special display mode will cause serious trapezoidal distortion in the final displayed image. If this distortion cannot be pre-corrected in signal processing, it will be Greatly affect its use effect, so that the application is limited

Method used

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  • Video-frequency picture geometrical distortion correction method and system
  • Video-frequency picture geometrical distortion correction method and system
  • Video-frequency picture geometrical distortion correction method and system

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0034] vertical keystone

[0035] figure 1 is a schematic diagram of the pixel dot matrix displayed on the display screen or display light chip after the vertical trapezoidal distortion is pre-corrected, where L is the minimum number of pixels in the horizontal direction for correcting the vertical trapezoidal distortion. Compared with the initial image display format, The reduction in the number of pixels on the short side compared to the long side in the horizontal direction is

[0036] ΔHM=N-L 2-1

[0037] Because the image outline is trapezoidal, the reduction of the number of horizontal pixels changes linearly along the vertical direction. Therefore, for any row (set as the i-th row), the reduction of the number of pixels is

[0038] ΔHi=ΔHM*(i-1) / (M-1)=(N-L)*(i-1) / (M-1)

[0039] 2-2

[0040] In genera...

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Abstract

The method includes steps: (1) reading out row value and column value of pixel address from frame memory; (2) according to certain mode to change row value and column value in step (1) so as to obtain corrected addresses of reading frame memory, and saving the corrected addresses to address memory for reading out; (3) according to certain mode to change row value and column value in step (1) so as to obtain corrected display addresses of pixels and then saving the display addresses to address memory for display. The disclosed technical scheme carries out precorrection for dot matrix of display image with geometrical distortion generated effectively.

Description

technical field [0001] The invention relates to the technical field of video display, in particular to a method for correcting geometric distortion of video images. Background technique [0002] With the rapid development of science and technology and economy, display devices have become an indispensable and important part of government offices, educational demonstrations, business activities and even home entertainment. Due to the asymmetry of the optical path design or the limitations of the use conditions, the special display mode will cause serious trapezoidal distortion in the final displayed image. If this distortion cannot be pre-corrected in signal processing, it will be Greatly affect its use effect, so that the application is limited. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for correcting geometric distortion of video images. [0004] The present invention adopts following technical s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N3/23
Inventor 曹嘉灿
Owner KONKA GROUP