Coded-light setups with optimized transformations of code indices

Peter Lehle; Hansjoerg Gaertner; Hans J. Tiziani; C. Voland

doi:10.1117/12.248526

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21 August 1996 Coded-light setups with optimized transformations of code indices

Peter Lehle, Hansjoerg Gaertner, Hans J. Tiziani, C. Voland

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Proceedings Volume 2784, Vision Systems: Sensors, Sensor Systems, and Components; (1996) https://doi.org/10.1117/12.248526
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

A 3D-measuring system using the coded light approach yields as primary result a map of code index values. The height is a function of the code index and the lateral point coordinates. One approach to obtain the height values directly is to set up equations using an adequate mathematical model of the sensor. The parameters of this equation, some of them being simple geometrical and optical lengths, must be determined very precisely. If these parameters are not determined with sufficient precision, computation of the height values will not yield satisfying results. Another approach to calculate the height data from code index and lateral coordinates is to set up a direct transformation between them. To determine the parameters of this transformation reference objects with well-known extensions have to be measured. By inserting the known data (code index, lateral coordinates and height data) into the equations the parameters of the function can be determined. A great advantage of this approach is the independence from the modelling of the sensor, e.g. the orientation of the camera can be changed without changing the calibration process; a new calculation of the function parameters is sufficient.

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Peter Lehle, Hansjoerg Gaertner, Hans J. Tiziani, and C. Voland "Coded-light setups with optimized transformations of code indices", Proc. SPIE 2784, Vision Systems: Sensors, Sensor Systems, and Components, (21 August 1996); https://doi.org/10.1117/12.248526

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