A Study of Image Quality Analysis for a Cutaneous Capillary Imaging System

This paper describes a law-cost and non-invasive cutaneous imaging system on the basis of orthogonal polarization spectral (OPS) imaging for observing capillaries in nail-fold. We used two bandpass filters with different wavelengths (i.e., 482±17.5 nm and 556±10 nm) in front of the light source to evaluate the image resolution and quality individually. First, we adjusted the power of light source to verify the relationship between illumination and image quality. Second, we varied the skin temperature condition and compared the image quality at normal (33.09±0.75℃) and low (18.85±0.44℃) skin temperatures. As a result, the green light source was finally selected as the optimal choice because of its satisfying image resolution and higher contrast-to-noise ratio (CNR) at both normal and lower skin temperatures. In addition, the image registration function was used to solve the image movement problem which is due to breathing or slightly movement of volunteers or the imaging device.

並列關鍵字

Capillary ； Image quality ； Contrast-to-noise ratio

國際替代計量

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