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Color coding structural light three-dimensional measurement method based on green stripe center

A three-dimensional measurement and color coding technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of affecting the accuracy of three-dimensional measurement, unable to obtain stripe positioning, etc., and achieve the effect of improving anti-interference ability, reliable decoding and reducing blur.

Inactive Publication Date: 2008-10-22
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

At present, time coding mostly uses gray-scale stripes combined with Gray code and phase shift technology for coding. Since the fringe patterns captured by CCD-based cameras usually have the disadvantage of moving the boundaries between stripes in gray-scale coding to the side of dark stripes, it is impossible to obtain accurate data. The fringe positioning thus affects the three-dimensional measurement accuracy

Method used

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  • Color coding structural light three-dimensional measurement method based on green stripe center
  • Color coding structural light three-dimensional measurement method based on green stripe center
  • Color coding structural light three-dimensional measurement method based on green stripe center

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Embodiment 1

[0025] Color is a powerful descriptor in image analysis. Human eyes can only distinguish more than two dozen gray levels, but they can recognize thousands of colors. Almost all commonly used colors can be directly mixed from the three primary colors of red, green and blue, and these three primary colors are exactly consistent with the colors sensitive to the red cone, green cone and blue cone cells on the human retina. For a 24-bit true color image, there are 28 gray levels in each channel color, the gray level ranges from 0 to 255, and its colors can reach more than 160,000. Because it is difficult for the camera to distinguish all gray-scale colors. In order to maximize the difference between each color, the color stripes used in this encoding method only use the maximum gray level of 255 in each channel, that is, use the three primary colors red (255, 0, 0), green (0, 255, 0), blue (0, 0, 255) to encode. This greatly reduces the effects of various colors and system noise,...

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Abstract

The invention discloses a 3D measurement method based on green-fringe center color coded structured light. The importance development direction of the current vision 3D detection technique includes the structured light method which reflects the advantages in resolution and measuring speed. In the method, color replaces grey level for coding; the color is three basic colors, namely, red, green and blue so as to maximize the difference among the colors. Red and blue fringes in project fringes are coded in Gray code and red fringes are arranged at 0 and blue fringes are arranged at 1 while decoding. A green fringe with a wide pixel is inserted in every neighboring red and blue fringes, selecting the final digit of green pixel projection fringe among all neighboring red and blue fringes, the green fringe code value is not unique while decoding, the code value of the green fringe in pattern j only depends on the code values of the red and blue fringes in the former [1,.....j-1] and is not related to the color value of the neighboring pixel. The method has a wide application trend in industrial production and real life.

Description

Technical field: [0001] The invention relates to a color-coded structured light three-dimensional measurement method based on the center of green stripes, and relates to the fields of visual sensing measurement technology and system, and three-dimensional information collection and reconstruction. Background technique: [0002] Among non-contact three-dimensional measurement technologies, optical three-dimensional measurement technology is one of the most effective means to obtain three-dimensional information of objects, and it does not need to touch the surface of the measured object. At present, the key development directions of visual three-dimensional detection technology include structured light, stereoscopic image, Moiré method, holographic method, laser radar and other methods, among which structured light method shows advantages in resolution and measurement speed. [0003] The structured light method is to project the light emitted by the projector into the scene t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/03
Inventor 于晓洋关丛荣
Owner HARBIN UNIV OF SCI & TECH
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