Fig. 1. Schematic setup of the HHDREMI prototype system. LSU, light source unit; NBIF, narrowband bandpass interference filters; XAL, xenon arc lamp; FW, filter wheel; SNI, sequential monochromatic illuminations; IPU, image processing unit.

Fig. 2. Gray scale average of the mucosa images of the 24 spectral channels. The insets show different levels of the gray scale average.

Fig. 3. Procedure of the HDR mucosa image reconstruction in the radiance domain.

Fig. 4. (a) 570 nm spectral-channel mucosa image with (c) enlargement showing the vascular network; and (b) HDR mucosa image with (d) enlargement showing the vascular network.

Fig. 5. Spectral curves corresponding to blood-capillary and “no-blood-capillary” regions.