Dome screen demarcating method, demarcating system and control device

A calibration method and ball screen technology, applied in the field of image processing, can solve the problems of heavy construction work, poor splicing effect, high maintenance cost, etc.

Active Publication Date: 2016-07-20
上海智幻软件科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) It is necessary to manually splice the projection screen, so the construction work is intensive and the time period is long, especially due to the poor accuracy of human operation;
[0005] 2) After a period of operation of the large-size dome display playback system, the projectors are constantly shifted, causing the splicing effect to deteriorate and need to be re-calibrated, so the later maintenance costs are relatively high;
[0006] 3) Since the projection screen of the projector is seriously deformed, and manual splicing requires a relatively regular projection screen, the redundant projection area will be cut off during the splicing of the dome screen, which will affect the pixel utilization of the projector. At the same time, the optical path design requires more High, increasing implementation cost

Method used

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  • Dome screen demarcating method, demarcating system and control device
  • Dome screen demarcating method, demarcating system and control device

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Embodiment 1

[0052] The dome calibration method provided by the embodiment of the present invention is applied in a dome playback system, the dome playback system includes multiple projectors, a spherical camera, a dome and a control device, wherein the dome camera is a spherical surface composed of multiple cameras Panoramic camera, multiple projectors project the calibration picture to the spherical camera, and the spherical camera forwards the collected calibration picture to the control device for processing, and the processed image is directly projected on the dome screen.

[0053] Such as figure 1 As shown, the ball screen calibration method provided by the embodiment of the present invention includes:

[0054] S1. Pre-construct a spherical camera mapping spherical model W, and obtain the position T of the spherical camera in the spherical screen;

[0055] S2. Determine the coordinate X of the calibration image sampling point projected by the first projector on the spherical camera,...

Embodiment 2

[0085] Such as figure 2 As shown, the ball screen calibration method provided by the embodiment of the present invention includes:

[0086] 201. Pre-calibrate the spherical camera;

[0087] In the embodiment of the present invention, the spherical camera is a special panoramic camera composed of multiple wide-angle cameras on a sphere step by step. It can cover a full viewing angle of 360 degrees horizontally, look up at a viewing angle of 270 degrees, and calibrate through computer multi-eye vision. The method can predict the internal and external parameters of each camera in advance, such as the internal reference matrix parameter W, the position parameter T, and the orientation parameter D. Then the coordinates of the position parameter T and the orientation parameter D of multiple cameras are uniformly converted to the coordinate system L with the center of the panoramic camera system as the coordinate origin to obtain parameters LT and LD; the three parameters of W, LT ...

Embodiment 3

[0114] Such as image 3 As shown, the spherical screen calibration method provided by the embodiment of the present invention is applied in the specific implementation process of a large-scale astronomical theater, and 5 projectors (1024*768 resolution) are used to splice a spherical screen. The calibration process of the present invention is as follows :

[0115] 301. Pre-calibrate the spherical camera.

[0116] The camera in the embodiment of the present invention adopts a high-resolution CCD camera, such as a camera with a resolution of 6000*4000pixel, which adopts an 8MM large-angle lens, and uses an ideal sphere model to project the image coordinates of the camera onto the ideal sphere coordinates , to get the internal parameter W of the spherical camera. Any coordinate point on the camera can be transformed to the only coordinate point on the sphere through the internal parameter W. At the same time, determine the spherical space position T of the spherical camera on ...

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Abstract

The embodiments of the invention provide a dome screen demarcating method, a demarcating system and a control device. The method includes the following steps: constructing in advance a mapping sphere model W of a sphere camera, and acquiring a position T of the sphere camera in a dome screen space; determining a coordinate X of a sampling point of a demarcating image which is projected by a first projector on the sphere camera, in accordance with the mapping sphere model W and the position T of the sphere camera in the dome screen, acquiring a position coordinate Z of the coordinate X of the sampling point in the sphere screen space; in accordance with the coordinate V of the first projector and the coordinate Z of the coordinate X of the sampling point in the sphere screen space, constructing a mathematics conversion model U1 of the demarcating image projected by the first projector to a dome screen image; using the aforementioned method, constructing mathematics conversion models U2......Un of demarcating images output by other projectors to the dome screen images, in which n is the number of the projectors; in accordance with the mathematics conversion models U1......Un, generating the complete dome screen image.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a ball screen calibration method, calibration system and control equipment. Background technique [0002] The size of the current dome display playback system includes various sizes from small size (0.5m-3.0m in diameter) to large size (more than 5m in diameter). The small size dome display system is suitable for advertising because of its general projection effect , or as a decorative occasion, and is often placed outdoors for viewing; while a large-size dome display system has a good projection effect and a strong three-dimensional effect, and is suitable for high-demand occasions such as special large-scale theaters and virtual reality devices. use. [0003] In the existing technology, the general small-size dome display system uses a single projector to realize it through a fisheye lens. Even if a high-resolution and high-brightness projector is used, the resolution and color...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 秦永进李艳玲
Owner 上海智幻软件科技有限公司
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