Correction method, storage medium and projection system for grayscale nonlinearity of digital projector

A technology of a digital projector and a correction method, which is applied to the parts of the TV system, the use of projection devices, image reproducers, instruments, etc., which can solve the problem of low accuracy of grayscale acquisition of fringe images, low accuracy of phase information solution, and limited projection effect and other problems to achieve the effect of improving the accuracy of the solution and improving the accuracy
CN113242416BActive Publication Date: 2022-06-21TZTEK TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TZTEK TECH
Publication Date
2022-06-21

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Abstract

The invention provides a gray scale non-linear correction method, storage medium and projection system of a digital projector. The method includes using a computer to generate an ideal gray scale image sequence, collecting gray scale images with a camera, and calculating the actual gray scale from N groups of actual gray scale images. degree mean I k , draw the gray mean curve including the linear part and the nonlinear part and fit the gray mean curve, obtain the mapping relationship between the ideal projected gray level and the corrected ideal gray level, and obtain the actual gray level under different current values value table, establish a two-dimensional corrected ideal gray level correction lookup table with the ideal gray level before current correction as a variable, and use the corrected ideal gray level value to generate a sinusoidal curve and project it. The method of the invention can directly perform non-linear correction on the projected image of the projector, and is also applicable when the brightness of the projector changes, thereby improving the accuracy of grayscale collection of fringe images, thereby greatly improving the accuracy of solving phase information.
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Description

technical field

[0001] The invention relates to the technical field of image data processing and optical three-dimensional measurement, in particular to a method for calibrating gray scale nonlinearity of a digital projector, a storage medium and a projection system, which can be applied to three-dimensional measurement in the process of IC component packaging and semiconductor silicon wafer processing and manufacturing. Quantitative testing, etc. Background technique

[0002] The fringe projection 3D measurement technology is one of the research hotspots in the field of optical 3D measurement, which has the advantages of non-contact, high speed and high accuracy. During measurement, a digital projector is generally used to project the sinusoidally varying fringes on the surface of the object to be measured, and then the phase information in the field of view is obtained from the image of the deformation fringes that are height-modulated by the object to be measured. 3D hei...

Claims

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