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Geometric correction method, device and system for projection image

A technology for geometric correction and image projection, applied in the field of image processing, can solve problems such as large correction error, inability to widely use various types of projection screens, and imperfect splicing and fusion of images, to ensure efficiency and accuracy, convenient debugging, The effect of precise goal orientation

Active Publication Date: 2015-11-18
BEIJING TRICOLOR TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operator will spend a lot of time to determine the parameters, and the images of each projector cannot be perfectly spliced ​​and blended
[0008] At present, some of the existing geometric correction methods cannot be widely applied to various types of projection screens, some have large correction errors, some have long correction time and complex parameters, and lack a convenient and widely applicable to various curved surface shapes. A Geometric Correction Method for Angle Projection

Method used

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  • Geometric correction method, device and system for projection image
  • Geometric correction method, device and system for projection image

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Embodiment 1

[0034] This embodiment discloses a geometric correction method of projected images. The correction of the projected image of a single projector is taken as an example to describe in detail below.

[0035] like figure 1 As shown, the method mainly includes:

[0036] Step S1, creating a projector coordinate system.

[0037] In the present invention, the "projector coordinate system" can be regarded as, but cannot be equated with, the coordinate system of the internal processing data of the projector. The so-called "coordinate system that can be regarded as the coordinate system for processing data inside the projector" refers to the regularity of the coordinate system, that is, the "projector coordinate system" is a regular coordinate system that will not change due to the shape of the projection screen. The so-called "coordinate system that is not equivalent to the internal processing data of the projector" refers to the specific execution subject that uses this coordinate s...

example 1

[0044] Example 1: Assume that the rectangular source image ABCD (A, B, C, and D are the four vertices of the rectangle) is not corrected and the area projected onto the projection screen is an irregular image, and the vertices ABCD correspond to EFGH on the screen. If the user It is necessary to select a regular rectangular area IJKL in the EFGH projection screen area as the target projection area, where I, J, K, and L are the four vertices of the target projection area, and the I vertex on the projection screen can be calibrated respectively through this test point The coordinates of vertex W in the corresponding projector coordinate system, the coordinates of vertex X in the projector coordinate system corresponding to vertex J on the projection screen, the coordinates of vertex Y in the projector coordinate system corresponding to vertex K on the projection screen, L on the projection screen The coordinates of the vertex Z in the coordinate system of the projector correspond...

Embodiment 2

[0052] This embodiment can be regarded as a special case of Embodiment 1, or:

[0053] If the first embodiment is regarded as the first correction, this embodiment can also be regarded as the second correction based on the first embodiment.

[0054] In the above-mentioned first embodiment, as described in step S3 "correcting the image according to the coordinates of each target vertex", it can perform geometric correction of the projected image according to the default boundary bending attribute between each target vertex. In this embodiment, the boundary curvature attribute can be further opened to the user, allowing them to adjust the boundary curvature attribute value of the target image through the boundary curvature compensation coefficient, and then finally correct the regular display on the projection screen through the reasonable assignment of the boundary curvature compensation coefficient projected image. Based on the same purpose, this embodiment also provides a me...

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Abstract

The invention discloses a method, a device and a system for geometry correction on a projection image and improves correction convenience. The correction method comprises steps that: a projector coordinate system is established; coordinates of various object vertexes of an image to be corrected under the projector coordinate system are logged; under the projector coordinate system, the image is corrected according to the coordinates of the various object vertexes. The method, the device and the system for geometry correction are suitable for geometry correction on images having multiple curved surface shapes and different angle projections.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a geometric correction method, device and system for projection images. Background technique [0002] Projectors are widely used in command centers, video conference rooms, multimedia multi-function halls, etc. In order to achieve different projection effects, projection screens are divided into plane, cylinder, spherical and other types. Due to the limitation of the location of the projector and the influence of the curved shape of the projection screen, the image projected by the projector on the projection screen will be deformed to varying degrees. Therefore, it is necessary to perform geometric correction on the source image, so that the corrected image can display a regular effect on the projection screen. In image fusion processing, geometric correction usually includes not only correcting the irregular images on the projection screens of each projector ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31H04N5/74
Inventor 余绵梓孙怀义宋良多
Owner BEIJING TRICOLOR TECH
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