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Digital projector gray scale nonlinearity correction method, storage medium and projection system

A technology for digital projectors and correction methods, which is applied to components of TV systems, image reproducers using projection devices, instruments, etc., can solve the problem of limited projection effects, grayscale acquisition accuracy of fringe images, and low accuracy of phase information solution and other problems to achieve the effect of improving accuracy and solving accuracy

Active Publication Date: 2021-08-10
TZTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This limits the projection effect, resulting in low accuracy of grayscale acquisition of fringe images and low accuracy of phase information solution.

Method used

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  • Digital projector gray scale nonlinearity correction method, storage medium and projection system
  • Digital projector gray scale nonlinearity correction method, storage medium and projection system
  • Digital projector gray scale nonlinearity correction method, storage medium and projection system

Examples

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no. 1 example

[0029] A kind of correction method of gray scale non-linearity of digital projector, see figure 1 , the correction method includes the following steps.

[0030] Step S1, using a computer to generate an ideal grayscale image sequence, the ideal grayscale image sequence includes 256 grayscale images of theoretical grayscale Ic; wherein, the ideal grayscale image sequence is 8bit, within the range of 0 to 255, The grayscale change interval is 1.

[0031] Step S2, use a projector to project the 256 grayscale images generated in step S1, collect grayscale images with a camera, and collect 256 images for each group, and collect N groups in total, where N is a positive integer ≥ 2;

[0032] Step S3, calculating the mean value of the images corresponding to the same ideal projection gray level in the collected N groups of actual gray level images as the actual gray level mean value I k ,

[0033]

[0034] In the formula, i and j represent the number of rows and columns in the im...

no. 2 example

[0059] The present invention also provides a computer-readable storage medium, on which computer instructions are stored, and the steps of the aforementioned method are executed when the computer instructions are executed. Wherein, for the method, please refer to the detailed introduction in the foregoing part, and details will not be repeated here.

[0060] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the computer-readable medium includes permanent Both non-permanent and non-permanent, removable and non-removable media can be implemented by any method or technology for information storage. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are n...

no. 3 example

[0063] A digital projection system for non-linear correction of image grayscale, see figure 2 , the digital projection system includes a computer 1, a projector 2, a camera 3 and a diffuse reflection ceramic plate 4, wherein the projector 2 and the camera 3 are connected to the computer 1 by telecommunication, and the optical axis of the projector 2 is connected to the The optical axis of the camera 3 is set at an included angle δ; when projecting an image, use the computer 1 to send sequence instructions to the projector 2, and the projector 2 sends a synchronous signal to trigger the camera 3 to synchronously collect the projected image on the diffuse reflection ceramic plate 4.

[0064] The computer 1 includes a pre-storage module, a relay storage module, an image processing module, and an image output module; wherein, in the pre-storage module, a sinusoidal fringe image with characteristic information, sequence instructions, synchronization signals and system parameters ar...

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Abstract

The invention provides a digital projector gray nonlinearity correction method, a storage medium and a projection system. The method comprises the following steps: generating an ideal grayscale image sequence by using a computer, collecting grayscale images by using a camera, solving an actual grayscale mean value Ik by using N groups of actual grayscale images, drawing a grayscale mean value curve comprising a linear part and a nonlinear part, and fitting the grayscale mean value curve to obtain a mapping relation between an ideal projection grayscale and a corrected ideal grayscale, obtaining a value table of actual gray under different current values, establishing a two-dimensional corrected ideal gray correction lookup table taking the ideal gray before current correction as a variable, and generating a sine curve by using the corrected ideal gray value and projecting the sine curve. According to the method, nonlinear correction can be directly carried out on the projection image of the projector, and the method is also suitable for changing the brightness of the projector, so that the accuracy of collecting the gray scale of the stripe image is improved, and the solving accuracy of phase information is greatly improved.

Description

technical field [0001] The invention relates to the technical fields of image data processing and optical three-dimensional measurement, in particular to a correction method, a storage medium and a projection system for gray scale nonlinearity of a digital projector, which can be applied to the three-dimensional measurement in the process of IC component packaging and semiconductor silicon chip processing and manufacturing. Quantitative testing and other fields. Background technique [0002] The fringe projection three-dimensional measurement technology is one of the research hotspots in the field of optical three-dimensional measurement, which has the advantages of non-contact, fast and high accuracy. During the measurement, a digital projector is generally used to project the fringes with sinusoidal light intensity onto the surface of the measured object, and then the phase information in the field of view is obtained from the deformed fringe image modulated by the height ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/31H04N5/235G01B11/24
CPCH04N9/3185G01B11/2433H04N23/73
Inventor 王小卓谷孝东刘宇琛骆聪曹葵康蔡雄飞
Owner TZTEK TECH
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