Three-dimensional imaging method based on error diffusion dithering algorithm

An error diffusion and dithering algorithm technology, applied in the field of imaging, can solve the problem of affecting the sine of the fringe, and achieve the effect of improving the sine and reducing the imaging error.
CN110455219AInactive Publication Date: 2019-11-15SUZHOU JIANGAO OPTOELECTRONICS TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU JIANGAO OPTOELECTRONICS TECH
Publication Date
2019-11-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a three-dimensional imaging method based on an error diffusion dithering algorithm. The method includes the following steps: acquiring a threshold value obtained based on an average gray value and an error compensation parameter in a matrix around a pixel in an error diffusion dithering algorithm; adding an original gray value of a to-be-detected pixel point to a quantization error introduced in the error diffusion process, calculating a temporary gray value of each pixel in a full image, comparing the temporary gray values with the threshold, indicating the pixel output to be 255 under the condition of being larger than the threshold by the temporary gray values, and otherwise, indicating the pixel output to be0; and carrying out defocusing on the output pixel toobtain three-dimensional imaging. On the basis of the threshold optimization method, the three-dimensional structured light imaging is optimized, so that the sinusoidal nature of the defocusing grating is improved effectively and the imaging errors are reduced.
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Description

technical field

[0001] The invention relates to an imaging method, in particular to a three-dimensional imaging method based on an error diffusion dithering algorithm. Background technique

[0002] The structured light phase shift method plays an important role in the field of three-dimensional shape measurement because of its non-contact, fast processing and high precision characteristics. Various phase shifting methods, including three-step, four-step and N-step phase-shifting methods, are used for three-dimensional reconstruction of objects. The more the number of fringes projected by the phase-shifting method, the higher the accuracy.

[0003] In the actual three-dimensional measurement process of structured light, the binary image can be used to approximate sinusoidal fringes through defocus binary encoding technology, so as to solve the influence of nonlinear effects on three-dimensional measurement. The defocus binary code only has two values ​​of 0 and 1, which does...

Claims

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