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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

Active Publication Date: 2022-06-21
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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  • Correction method, storage medium and projection system for grayscale nonlinearity of digital projector
  • Correction method, storage medium and projection system for grayscale nonlinearity of digital projector
  • Correction method, storage medium and projection system for grayscale nonlinearity of digital projector

Examples

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no. 1 example

[0029] A method for correcting grayscale nonlinearity of digital projectors, see figure 1 , the calibration 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 with theoretical grayscale Ic; wherein, the ideal grayscale image sequence is 8 bits, within the range of 0 to 255, The grayscale change interval is 1.

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

[0032] Step S3, average the images corresponding to the same ideal projected grayscale in the N groups of actual grayscale images collected as the actual grayscale mean value I k ,

[0033]

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

no. 2 example

[0057] The present invention also provides a computer-readable storage medium on which computer instructions are stored, and when the computer instructions are executed, the steps of the aforementioned method are performed. Wherein, for the method, please refer to the detailed introduction in the foregoing part, and details are not repeated here.

[0058] 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 relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the computer-readable medium includes a permanent Persistent 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 programs, or other data. Examples of computer storage media include, but are not limite...

no. 3 example

[0061] A digital projection system for image grayscale nonlinear correction, 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 telecommunicationly connected to the computer 1, 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 a sequence command to the projector 2, and the projector 2 sends a synchronization signal to trigger the camera 3 to synchronously collect the projected image on the diffuse reflection ceramic plate 4.

[0062] The computer 1 includes a pre-storage module, a relay storage module, an image processing module and an image output module; wherein the pre-storage module stores sinusoidal fringe images with characteristic information, sequence instructions, synchronization signals and system parameters, The ...

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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.

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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Application Information

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Patent Type & Authority Patents(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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