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A Method of Streak Detection Based on Camera Response Curve

A camera response and detection method technology, which is applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems affecting the accuracy of measurement, and achieve the effect of high precision

Active Publication Date: 2021-08-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the detection process, the quality of the obtained sinusoidal fringes (sinusoidal and noise of the fringes) will directly affect the accuracy of the measurement. Due to the influence of ambient light and the system error of the projector and camera, using the directly obtained sine fringes will produce relatively large big error

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  • A Method of Streak Detection Based on Camera Response Curve
  • A Method of Streak Detection Based on Camera Response Curve
  • A Method of Streak Detection Based on Camera Response Curve

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] refer to figure 1 , a streak detection method based on the camera response curve, including the following steps:

[0030] 1) Obtain the response curve of the camera by taking photos of fixed scenes with different exposure times;

[0031] 2) Project the sinusoidally varying grayscale stripes onto the object;

[0032] 3) Use the camera response curve to convert grayscale stripes into energy stripes;

[0033] 4) The energy fringes are phase-decoded by using the phase-shifting technology to obtain the model of the object to be measured.

[0034] Further, in the step 1), the exposure times are respectively 1 / 2, 1 / 10, 1 / 30, 1 / 60, 1 / 80, 1 / 100, 1 / 160 (the exposure time is set by yourself) image.

[0035] Obtain a set of photos with different exposure times to restore the camera's response curve; the longer the exposure time of the same pixel value, the greater the ...

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Abstract

A method for detecting streaks based on camera response curves, comprising the following steps: 1) obtaining the response curves of the camera by taking photos of fixed scenes with different exposure times; 2) projecting sinusoidal grayscale stripes onto objects; 3) utilizing The camera response curve converts grayscale fringes into energy fringes; 4) uses phase shift technology to decode the energy fringes to obtain the object model to be measured. The invention provides a fringe detection method based on the camera response curve with high precision.

Description

technical field [0001] The invention belongs to the field of object detection and relates to a stripe detection method based on a camera response curve. Background technique [0002] As a non-contact three-dimensional detection method, the fringe detection method has the advantages of high efficiency, rapidity, moderate accuracy, simple non-invasiveness, etc., and is widely used in reverse engineering, product quality inspection, medical diagnosis, etc. The fringe detection method needs to use a projector to project the sinusoidal gray-scale fringes onto the object, and then use a camera to capture the deformation of the fringe, and use a phase shift algorithm to decode it to obtain a three-dimensional model of the object. During the detection process, the quality of the obtained sinusoidal fringes (sinusoidal and noise of the fringes) will directly affect the accuracy of the measurement. Due to the influence of ambient light and the system error of the projector and camera,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/25
Inventor 朱文奇许金山
Owner ZHEJIANG UNIV OF TECH