Abstract
Focused light field camera can be used to measure three-dimensional (3-D) temperature field of a flame because of its ability to record intensity and direction information of each ray from flame simultaneously. This work aims to develop a suitable geometric calibration method of focused light field camera for 3-D flame temperature measurement. A modified method based on Zhang's camera calibration is developed to calibrate the camera and the measurement system. A single focused light-field camera is used to capture images of bespoke calibration board for calibration in this study. Geometric parameters including intrinsic (i.e., camera parameters) and extrinsic (i.e., camera connecting with the calibration board) of the focused light field camera are calibrated to trace the ray projecting onto each pixel on CCD (charge-coupled device) sensor. Instead of using line features, corner point features are directly utilized for the calibration. The characteristics of focused light field camera including one 3-D point corresponding to several image points and matching main lens and microlens f-numbers, are used for calibration. Results with a focused light field camera are presented and discussed. Preliminary 3-D temperature distribution of a flame is also investigated and presented.
Original language | English |
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Title of host publication | 2016 IEEE International Instrumentation and Measurement Technology Conference |
Place of Publication | Piscataway, N.J. |
Number of pages | 6 |
DOIs | |
Publication status | Published - 22 Jul 2016 |
Event | 2016 IEEE International Instrumentation and Measurement Technology Conference - Taipei International Convention Center, Taipei, Taiwan Duration: 23 May 2016 → 26 May 2016 Conference number: 37481 http://imtc2016.ieee-ims.org/ |
Conference
Conference | 2016 IEEE International Instrumentation and Measurement Technology Conference |
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Abbreviated title | I2MTC 2016 |
Country/Territory | Taiwan |
City | Taipei |
Period | 23/05/16 → 26/05/16 |
Internet address |
Keywords
- camera calibration
- focused light field camera
- ray tracing
- Zhang's calibration method
- temperature mesurement
- ccd image sensors