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 |
|---|---|
| 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 |
|---|---|
| Number | 2908 |
| ISSN | 0277-786X |
Conference
| Conference | Machine Vision Applications, Architectures, and Systems Integration V |
|---|---|
| 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 -