Abstract
A variety of time delay and integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low level operations since the exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Typically, the use of a TDI camera is restricted to cases where the surface is viewed from the direction of the surface normal. This is because the TDI-camera sensor has to be parallel to the viewed surface plane, in order to avoid a decrease of image quality due to varying magnification. However, in certain visual inspection applications it would be advantageous to use non-zero viewing angles. Three different solutions were tested and analyzes: a commercial shifting lens, standard lenses with an extension structure to support the lens in the shifting position and a commercial shifting and tilting lens. The results indicate that the TDI-camera can be used with viewing angles up to 30 degrees from the surface normal,which has been found to be the optimal viewing angle in some visual inspection applications.
Original language | English |
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Title of host publication | Machine Vision Applications, Architectures, and Systems Integration V |
Publisher | International Society for Optics and Photonics SPIE |
Pages | 72-79 |
Number of pages | 8 |
DOIs | |
Publication status | Published - 1 Dec 1996 |
MoE publication type | A4 Article in a conference publication |
Event | Machine Vision Applications, Architectures, and Systems Integration V - Boston, MA, United States Duration: 18 Nov 1996 → 18 Nov 1996 |
Publication series
Series | Proceedings of SPIE |
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Number | 2908 |
ISSN | 0277-786X |
Conference
Conference | Machine Vision Applications, Architectures, and Systems Integration V |
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Country | United States |
City | Boston, MA |
Period | 18/11/96 → 18/11/96 |
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Keywords
- TDI-camera
- Visual inspection
Cite this
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Using TDI camera with nonzero viewing angles for surface inspection. / Miettinen, Jari; Zelin, Xu; Ailisto, Heikki J.
Machine Vision Applications, Architectures, and Systems Integration V. International Society for Optics and Photonics SPIE, 1996. p. 72-79 (Proceedings of SPIE; No. 2908).Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review
TY - GEN
T1 - Using TDI camera with nonzero viewing angles for surface inspection
AU - Miettinen, Jari
AU - Zelin, Xu
AU - Ailisto, Heikki J.
PY - 1996/12/1
Y1 - 1996/12/1
N2 - A variety of time delay and integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low level operations since the exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Typically, the use of a TDI camera is restricted to cases where the surface is viewed from the direction of the surface normal. This is because the TDI-camera sensor has to be parallel to the viewed surface plane, in order to avoid a decrease of image quality due to varying magnification. However, in certain visual inspection applications it would be advantageous to use non-zero viewing angles. Three different solutions were tested and analyzes: a commercial shifting lens, standard lenses with an extension structure to support the lens in the shifting position and a commercial shifting and tilting lens. The results indicate that the TDI-camera can be used with viewing angles up to 30 degrees from the surface normal,which has been found to be the optimal viewing angle in some visual inspection applications.
AB - A variety of time delay and integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low level operations since the exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Typically, the use of a TDI camera is restricted to cases where the surface is viewed from the direction of the surface normal. This is because the TDI-camera sensor has to be parallel to the viewed surface plane, in order to avoid a decrease of image quality due to varying magnification. However, in certain visual inspection applications it would be advantageous to use non-zero viewing angles. Three different solutions were tested and analyzes: a commercial shifting lens, standard lenses with an extension structure to support the lens in the shifting position and a commercial shifting and tilting lens. The results indicate that the TDI-camera can be used with viewing angles up to 30 degrees from the surface normal,which has been found to be the optimal viewing angle in some visual inspection applications.
KW - TDI-camera
KW - Visual inspection
UR - http://www.scopus.com/inward/record.url?scp=0347093132&partnerID=8YFLogxK
U2 - 10.1117/12.257249
DO - 10.1117/12.257249
M3 - Conference article in proceedings
AN - SCOPUS:0347093132
T3 - Proceedings of SPIE
SP - 72
EP - 79
BT - Machine Vision Applications, Architectures, and Systems Integration V
PB - International Society for Optics and Photonics SPIE
ER -