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A Nonlinear Point Coordinate Mapping Method for Interactive Projection System

A technology of a projection system and a mapping method, applied in the field of projection, can solve problems such as inaccurate spot capture, achieve the effect of realizing non-linear deformity correction of images and ensuring normal interactive operations

Active Publication Date: 2022-03-22
安徽慧视金瞳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a nonlinear point coordinate mapping method for an interactive projection system to solve the technical problem of inaccurate capture of light spots caused by nonlinear distortion in the interactive projection system

Method used

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  • A Nonlinear Point Coordinate Mapping Method for Interactive Projection System

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Experimental program
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Effect test

Embodiment 1

[0033] 1. Determine the mapping transformation template

[0034] Collect 16 computer screen spot coordinates evenly distributed on the computer screen, project the computer screen spot coordinates, convert the corresponding spot mapping in the projection area into the computer screen coordinate system, and obtain the screen coordinate system spot coordinates, and then The spot coordinates of the screen coordinate system are mapped to the spot coordinates of the computer screen through FFD, and the deformation field is calculated, so as to obtain a mapping transformation template and save it.

[0035] Among them, FFD is an existing free-form surface deformation technology.

[0036] Among them, the deformation field is a kind of mapping rule, and the calculation rule is obtained by converting the offset coordinates of the screen coordinate system into the precise coordinates of the spot on the computer screen, and then obtain the conversion of the offset coordinates of the spot ...

Embodiment 2

[0058] In the present invention, the spot coordinates of the screen coordinate system and the spot coordinates on the computer screen image are mapped onto the computer screen by the projection area. In order to accurately locate the spot, it is necessary to obtain the position of the center of gravity of the spot, the The steps to obtain are:

[0059] a. Obtain all connected domains in the computer screen image. The connected domain refers to the edge contour point set of connected objects in the image, traverse all connected domains, and save the connected domain point set with the largest area:

[0060] Step a1, if the largest connected domain point set is not empty, then calculate the circumscribed rectangle of the largest connected domain point set;

[0061] Step a11, if the width or height of the circumscribed rectangle is greater than 15 pixels, then traverse the pixel values ​​of the circumscribed rectangle in the computer screen image, and accumulate the x-coordinate ...

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Abstract

The invention discloses a nonlinear point coordinate mapping method of an interactive projection system, comprising the following steps: step 1, determining a mapping transformation template; step 2, linear mapping of spot coordinates; step 3, nonlinear mapping of spot coordinates; step 4, realizing interact. The invention provides a nonlinear point coordinate mapping method of an interactive projection system, which can realize image nonlinear distortion correction, and convert the distorted light spot captured by the camera into an accurate light spot, thus ensuring the smoothness of the interactive classroom teaching system. normal interaction.

Description

technical field [0001] The invention relates to the field of projection, in particular to a nonlinear point coordinate mapping method of an interactive projection system. Background technique [0002] The interactive projection system is a system that cooperates with projectors, computers, cameras and other equipment, and can realize random finger touch control, interactive question and answer, remote communication and other functions on any smooth projection surface. [0003] Because the "interaction" in the interactive projection system is realized by capturing images through the camera and processing them by image algorithms, the camera is located in the upper front of the projection area, and is about 1 meter away from the projection area. The value 1 is just an empirical value, and the other The range is 0.8-1.2, the purpose is to make the camera shoot as wide as possible. When the camera captures the image of the projected area, due to the position of the camera, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G06F3/0488H04N9/31
Inventor 林传文汪俊锋高祥薛东阳
Owner 安徽慧视金瞳科技有限公司