Determination of actual object size distribution from direct imaging
Direct imaging is a technique commonly used in the study of particle, bubble, and droplet size distribution in a dynamic system. Objects such as particles, bubbles, and droplets can be present at various distances from the imaging device when images are captured. Hence, the location of the object wi...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/94070 http://hdl.handle.net/10220/6971 |
| _version_ | 1826125532805201920 |
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| author | Lau, Raymond Hossain, Md. Iqbal Chen, Tao Yang, Yanhui |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Lau, Raymond Hossain, Md. Iqbal Chen, Tao Yang, Yanhui |
| author_sort | Lau, Raymond |
| collection | NTU |
| description | Direct imaging is a technique commonly used in the study of particle, bubble, and droplet size distribution in a dynamic system. Objects such as particles, bubbles, and droplets can be present at various distances from the imaging device when images are captured. Hence, the location of the object will need to be known in order to determine the actual size of an individual object. However, the location of the object cannot be determined from a single image. A single calibration scale defined at the focusing plane is normally used for the determination of all the object sizes from images. When the focus is close to the imaging device, the change in magnification with location is large. The size distribution obtained from the use of a single calibration scale would thus give a considerable deviation from the actual size distribution. In this study, a statistical method is proposed to reconstruct the actual object size distribution from the experimental object size distribution obtained from images using a single calibration scale defined at the focusing plane. Experiments are performed to validate the accuracy of the proposed method on the particle size distribution determination in a settling system. The stability of the proposed method is also analyzed theoretically for imaging devices with different depth-of-field (DOF), focusing location, and change in magnification with distance. |
| first_indexed | 2024-10-01T06:37:53Z |
| format | Journal Article |
| id | ntu-10356/94070 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:37:53Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/940702020-03-07T11:35:34Z Determination of actual object size distribution from direct imaging Lau, Raymond Hossain, Md. Iqbal Chen, Tao Yang, Yanhui School of Chemical and Biomedical Engineering DRNTU::Engineering::Chemical engineering::Processes and operations Direct imaging is a technique commonly used in the study of particle, bubble, and droplet size distribution in a dynamic system. Objects such as particles, bubbles, and droplets can be present at various distances from the imaging device when images are captured. Hence, the location of the object will need to be known in order to determine the actual size of an individual object. However, the location of the object cannot be determined from a single image. A single calibration scale defined at the focusing plane is normally used for the determination of all the object sizes from images. When the focus is close to the imaging device, the change in magnification with location is large. The size distribution obtained from the use of a single calibration scale would thus give a considerable deviation from the actual size distribution. In this study, a statistical method is proposed to reconstruct the actual object size distribution from the experimental object size distribution obtained from images using a single calibration scale defined at the focusing plane. Experiments are performed to validate the accuracy of the proposed method on the particle size distribution determination in a settling system. The stability of the proposed method is also analyzed theoretically for imaging devices with different depth-of-field (DOF), focusing location, and change in magnification with distance. 2011-09-05T03:39:57Z 2019-12-06T18:50:18Z 2011-09-05T03:39:57Z 2019-12-06T18:50:18Z 2009 2009 Journal Article Hossain, M. I., Chen, T., Yang, Y. H., & Lau, R. (2009). Determination of Actual Object Size Distribution from Direct Imaging. Industrial & Engineering Chemistry Research, 48, 10136-10146. 0888-5885 https://hdl.handle.net/10356/94070 http://hdl.handle.net/10220/6971 10.1021/ie900857m 149015 en Industrial & engineering chemistry research @ 2009 American Chemical Society 11 p. |
| spellingShingle | DRNTU::Engineering::Chemical engineering::Processes and operations Lau, Raymond Hossain, Md. Iqbal Chen, Tao Yang, Yanhui Determination of actual object size distribution from direct imaging |
| title | Determination of actual object size distribution from direct imaging |
| title_full | Determination of actual object size distribution from direct imaging |
| title_fullStr | Determination of actual object size distribution from direct imaging |
| title_full_unstemmed | Determination of actual object size distribution from direct imaging |
| title_short | Determination of actual object size distribution from direct imaging |
| title_sort | determination of actual object size distribution from direct imaging |
| topic | DRNTU::Engineering::Chemical engineering::Processes and operations |
| url | https://hdl.handle.net/10356/94070 http://hdl.handle.net/10220/6971 |
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