Chongfan Technology
News
26
2024
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10
What is Structured Light?
Author:
Structured light is a technique used for vision measurement, which calculates the depth and shape of an object by projecting a beam of specific patterns onto the target surface and observing the changes in these patterns. The following is a detailed explanation of structured light:
Definition of 1.
Structured light is the projection of a particular light pattern (such as a plane, grid, or more complex shape) onto an object from a known angle. When these light patterns intersect the object, they form a visible bright line or pattern on the surface of the object. By observing the distortion and deformation of these bright lines or patterns, the height change of the surface of the object can be calculated, and the three-dimensional information of the object can be obtained.
2. working principle
The working principle of structured light is mainly based on the principle of triangulation. In structured light systems, a laser or projector is typically used as a light source to project a light pattern of a particular pattern onto an object. The reflected pattern changes are then captured by the camera. Due to the different shape and depth of the surface of the object, the reflected light pattern will be distorted or deformed accordingly. By analyzing these distorted or deformed patterns, the three-dimensional coordinates and shape of the object can be calculated.
3. Type
Structured light technology can be divided into many kinds according to the type of projected light pattern, mainly including point structured light, line structured light and coded structured light.
1. Point structured light: A point light source is projected onto the surface of the object, and the target is imaged and processed by the camera to obtain the three-dimensional coordinates on it. This method needs to scan the surface of the measured object point by point, so as to obtain the three-dimensional shape of the whole object.
2. Line structured light: The three-dimensional coordinates on the projection line are obtained by scanning lines, which greatly improves the measurement efficiency.
3. Coded structured light: The coded pattern is projected onto the target surface in a certain way to obtain the three-dimensional profile of the measured object. By using the coding method, the projection angle of each point can be obtained, and the three-dimensional information of the target can be obtained and reconstructed by constructing the basic equation of the light. Coded structured light method is one of the most reliable three-dimensional measurement techniques, which has the advantages of short acquisition time and high measurement accuracy.
4. Application Areas
Structured light technology is widely used in many fields, including but not limited:
1. Face recognition: For example, Apple's Face ID function uses structured light technology to create a depth map of the face to ensure the accuracy and security of recognition.
2. Virtual reality and augmented reality: Structured light technology can be used for accurate measurement and modeling, providing high-precision 3D data for virtual reality and augmented reality applications.
3. Industrial measurement: Structured light technology can be used in industrial measurement fields such as quality control and surface inspection to improve production efficiency and product quality.
In summary, structured light is an important vision measurement technique that calculates the depth and shape of an object by projecting a beam of light of a specific pattern onto the target surface and observing its changes. It is widely used in many fields and provides high-precision 3D data support for related applications.
Chongqing Chongfan Technology Co., Ltd. Optical platform film thickness meter OCT optical coherence tomography LabVIEW control
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