Abstract

An image quality investigation of visible spectral imaging systems was performed. Spectral images were simulated using differ-ent combinations of imaging system parameters with different numbers of imaging channels, wavelength steps, and noise levels based on two practical spectral imaging systems. A mean opinion score ( MOS) was determined from a subjective visual assess-ment scale experiment for image quality of spectral images, rendered to a three- channel LCD display. A set of image distortion measures, including color difference for color images, were defined based on image quality concerns. The relationships between the distortion factors and the combinations of parameters in spectral imaging systems are discussed in detail. The MOS values and distortion measures were highly correlated. The results indicate that the image quality of spectral imaging systems was significantly affected by the number of channels used with noise in the image capture stage. The selection of wavelength steps had no significant impact on final image quality, especially when there was no noise involved. The results also showed that the contrast factor indicates a different impact on image quality for human portraits compared to other relatively complex scene images. An empirical metric is proposed to estimate the scaled image quality. The correlation between this metric and the subjec-tive measure, MOS, was 0.97. The results also indicate that two distortion factor eigenvectors were sufficient to represent four distortion factors used in this experiment. This suggests that further research needs to be performed to find more efficient distortion factors.

Publication Date

2004

Comments

This article may be accessed on the publisher's website (additional fees may apply) at: http://www.imaging.org/store/epub.cfm?abstrid=30702 ISSN:1062-3701 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type

Article

Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)

Campus

RIT – Main Campus

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