© The Institution of Engineering and Technology
Presented is a novel method for integrating the artificial-compound eye (ACE) structure with the multichannel filter on one substrate based on the microfabrication technique. By this method, a compact multi-spectral imaging lens was developed. From the point of view of the structure, it is a microlens array with the function of a filter, hence, it is called a filtering ACE. The lens has several optical units, and each unit can capture the information for a certain band which corresponds to the red, green, blue and near-infrared bands. The fabrication process and key steps are discussed in detail. Based on this filtering ACE lens, a multi-spectral imaging system was set up. The imaging results prove that the system can realise colour separation and multi-units imaging as expected. The work band of the system covers the whole visible band and a part of near-infrared band. In addition, a light blocking layer and a light separation layer were added in the filtering ACE and the image quality was improved. The novel filtering ACE structure is suitable to be applied in smart multi-spectral imaging system because of its high integration level and the ability of capturing the multi-band images.
References
-
-
1)
-
1. Petteri, T.: ‘Multispectral imaging’ (Course Project for Imaging and Display Technology in Helsinki University of Technology, 2007).
-
2)
-
16. Bassoli, E., Gatto, A., Iuliano, L., Grazia-Violante, M.: ‘3D printing technique applied to rapid casting’, Rapid Prototyping J., 2007, 13, (3), pp. 148–155 (doi: 10.1108/13552540710750898).
-
3)
-
8. Eichenholz, J.M., Barnett, N., Juang, Y., et al: ‘Real time megapixel multispectral bioimaging’, Proc. SPIE, 2010, 7568, pp. 75681L.
-
4)
-
9. Pal, H.S., Neifeld, M.A.: ‘Multispectral principle component imaging’, Opt. Express, 2003, 11, (18), pp. 2118–2125 (doi: 10.1364/OE.11.002118).
-
5)
-
12. Shogenji, R., Kitamura, Y., Yamada, K., et al: ‘Multispectral imaging using compact compound optics’, Opt. Express, 2004, 12, (8), pp. 1643–1655 (doi: 10.1364/OPEX.12.001643).
-
6)
-
14. Popvic, Z.D., Sprague, R.A., Connel, G.A.N.: ‘Technique for monolithic fabrication of microlens arrays’, Appl. Opt., 1988, 27, (7), pp. 1281–1284 (doi: 10.1364/AO.27.001281).
-
7)
-
13. Sabnis, R.W.: ‘Color filter technology for liquid crystal displays’, Displays, 1999, 20, pp. 119–129 (doi: 10.1016/S0141-9382(99)00013-X).
-
8)
-
4. Yamaguchi, M., Teraji, T., Ohsawa, K., et al: ‘Color image reproduction based on the multispectral and multiprimary imaging: experimental evaluation’, Proc. SPIE, 4663, 2002, pp. 15–26.
-
9)
-
3. Murakami, Y., Obi, T., Yamaguchi, M., et al: ‘Nonlinear estimation of spectral reflectance based on Gaussian mixture distribution for color image reproduction’, Appl. Opt., 2002, 41, (23), pp. 4840–4847 (doi: 10.1364/AO.41.004840).
-
10)
-
10. Hardeberg, J.Y.: ‘Multispectral color image capture using a liquid crystal tunable filter’, Opt. Eng., 2002, 41, (10), pp. 2532–2548 (doi: 10.1117/1.1503346).
-
11)
-
5. Paquit, V.C., Tobin, K.W., Price, J.R.: ‘3D and multispectral imaging for subcutaneous vein detection’, Opt. Express, 2009, 17, (14), pp. 11360–11365 (doi: 10.1364/OE.17.011360).
-
12)
-
11. Horridge, G.A.: ‘The compound eye of insects’, Sci. Am., 1977, 237, p. 108 (doi: 10.1038/scientificamerican0777-108).
-
13)
-
7. Anna, P., Pasquale, F., Leonardo, P., et al: ‘Multispectral imaging for early diagnosis of melanoma’, Proc. SPIE, 2013, 8668, p. 86684A.
-
14)
-
6. Chung, S., Fried, D., Staninec, M., et al: ‘Multispectral near-IR reflectance and transillumination imaging of teeth’, Biomed. Opt. Express, 2011, 2, (10), pp. 2804–2814 (doi: 10.1364/BOE.2.002804).
-
15)
-
2. Themelis, G., Yoo, J.S., Ntziachristos, V.: ‘Multispectral imaging using multiple-bandpass filters’, Opt. Lett., 2008, 33, (9), pp. 1023–1025 (doi: 10.1364/OL.33.001023).
-
16)
-
15. Aldalali, B., Li, C., Zhang, L., et al: ‘Micro cameras capable of multiple viewpoint imaging utilizing photoresist microlens arrays’, J. Microelectromech. Syst., 2012, 21, (4), pp. 945–952 (doi: 10.1109/JMEMS.2012.2194773).
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