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Fig. 4
Four typical sample images under different viewing angles at wavelength 633 nm. The incident zenith is fixed at 45°. The sample positions are the same as those shown in Fig. 1. The relative reflectance values of pixels in all images have the same scale.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
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