Color object rapid three-dimensional measurement method based on color response model

A technology of three-dimensional measurement and color response, applied in the field of image processing, which can solve problems such as affecting the quality of color-coded images

Active Publication Date: 2021-04-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the introduction of color coding technology, when measuring a color object,...

Method used

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  • Color object rapid three-dimensional measurement method based on color response model
  • Color object rapid three-dimensional measurement method based on color response model
  • Color object rapid three-dimensional measurement method based on color response model

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specific Embodiment 1

[0055] The method for fast three-dimensional measurement of colored objects based on the color response model of this embodiment, the flow chart is as follows figure 1 As shown, the method includes the following steps:

[0056] Step a, encoding the color pattern, and calibrating the crosstalk matrix.

[0057] Step b, projecting the color-coded image, and the CCD collects the deformed fringes.

[0058] Step c, decrosstalking the collected image, extracting RGB channels, calculating the surface reflectance of the object, and sinusoidally compensating the phase shift fringes.

[0059] Step d, using three-step phase shift to obtain phase information.

[0060] Unwrapped phase using order information, using three order fringe maps in c.

specific Embodiment 2

[0062] This embodiment is a measurement system diagram of the first embodiment.

specific Embodiment 3

[0064] The color coding scheme of the present embodiment, on the basis of the specific embodiment 1, further defines the specific steps of step a as follows:

[0065] Step a1: Encode three color patterns as a projected image group.

[0066] The phase shift fringe coding formula is: I k (x,y)=R(x,y)[A(x,y)+B(x,y)cos(φ I +δ k )]

[0067] where φ I=2πyf 0

[0068] This method uses a three-step phase-shift method to encode three color patterns. The first R channel is a solid color image, the G channel is a secondary fringe with a phase shift of 0, the B channel is a sinusoidal fringe with a phase shift of 0, and the second The R channel is a sinusoidal fringe with a phase shift of 2π / 3, the G channel is a solid color image, the B channel is a secondary fringe with a phase shift of 2π / 3, and the third R channel is a secondary fringe with a phase shift of 4π / 3. The B channel is a sinusoidal fringe with a phase shift of 4π / 3, and the B channel is a solid color image....

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Abstract

The invention provides a color object rapid three-dimensional measurement method based on a color response model. The color object rapid three-dimensional measurement method based on the color response model comprises the following steps of S1, encoding a color pattern, and calibrating a crosstalk matrix, S2, projecting a color coded graph, and acquiring deformed stripes by a CCD, S3, descrambling the acquired image, extracting an RGB channel, calculating the surface reflectance of the object, and correcting phase shift stripes, S4, obtaining phase information by using three-step phase shift, and S5, unwrapping the wrapped phase by using the level information. The color object rapid three-dimensional measurement method based on the color response model provided by the invention has the advantages that the interference of the object surface texture information on the coding pattern can be well weakened, the measurement precision is improved, and a better measurement effect is obtained.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a fast three-dimensional measurement method for color objects based on a color response model. Background technique [0002] In recent years, structured light projection three-dimensional measurement technology has been widely used in many fields such as industrial measurement and digital protection of cultural relics due to its characteristics of non-contact, fast measurement speed and high precision. As the three-dimensional measurement of structured light is more and more widely used, the characteristics of the measured object are also more complex. Objects that need to be measured are no longer limited to white or light-colored objects, but extend to objects with rich colors, textures, and uneven heights on the surface. In order to increase the measurement speed, a color-coding technique is proposed so that a projected image carries more information. [0003] Due t...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/25G01B11/2509
Inventor 李洪儒包忠毅袁寒崔磊
Owner SICHUAN UNIV
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