[1] Wang Fangyong, Wang Keru, Li Shaokun, et al.. Estimation of chlorophyll and nitrogen contents in cotton leaves using digital camera and imaging spectrometer[J]. Acta Agronomica Sinica, 2010, 36(11): 1981-1989.

[2] Wang Jian, Li Shaofa. Study on computer vision grading based on apple coloration area[J]. Computer Engineering and Design, 2008, 29(11): 3813-3814, 3817.

[3] Zhao Shimin,Wang Jun. De-/re- mineralization in deciduous teeth assessed by color value analysis of digital photographs: an in vivo study[J]. Shanghai Journal of Stomatology, 2011, 20(5): 527-530.

[4] Yang Ping, Liao Ningfang, Song Hong. Study of approaches to spectral reflectance reconstruction based on digital camera[J]. Spectroscopy and Spectral Analysis, 2009, 29(5): 1176-1180.

[5] Chen Yiyi, Xu Haisong, Zhang Xiandou, et al.. Study of spectral reconstruction based on digital camera[J]. Acta Optica Sinica, 2009, 29(5): 1416-1419.

[6] X D Zhang, H S Xu. Reconstructing spectrla reflectance by dividing spectrla space and extending the principal components in principal component analysis[J]. J Opt Soc Am A, 2008, 25(2): 371-378.

[7] Y Wang, H S Xu. Spectral characterization of scanner based on PCA and BP ANN[J]. Chinese Optics Letters, 2005, 3(12): 725-728.

[8] Y Wang, H S Xu. Spectrla charaterization of a flat panel color scanner using PCA method[C]. SPIE, 2006, 6033: 60330J.