抄録
It was revealed that estimated vegetation indices with a commercial digital camera have shown anomalously high values over 0.9 in NDVI (Normalized Difference Vegetation Index) for a shady area of the camera images. It was manifested that an exclusion of pix- els of the camera image with luminance below a threshold is a key method to remove the shady area and to acquire much better esti- mation of vegetation index. Appropriate luminance for the purpose requires us to exclude pixels of the image with luminance below about 70 out of 255. Successful removal of shady/anomalous NDVI areas and excellent estimation of vegetation index from the im- ages of the specific digital camera were obtained.
https://ror.org/01cg0k189 
