Following are examples of unprocessed photographs comparing a stock Canon
ELPH300 camera to our NDVI version.
Keep in mind that for the ELPH300NDVI camera, the color channels
are mapped where
![bullet](_themes/fpg-gradient07c/dot.gif) | Red = Near Infared |
![bullet](_themes/fpg-gradient07c/dot.gif) | Green = Visible Green Light |
![bullet](_themes/fpg-gradient07c/dot.gif) | Blue = Visible Blue Light |
Processed images were created with ImageJ and our custom
aNDVI7_MKII macro which maps NDVI values to various colors where
![bullet](_themes/fpg-gradient07c/dot.gif) | Green is highest NDVI value |
![bullet](_themes/fpg-gradient07c/dot.gif) | Yellow is under green |
![bullet](_themes/fpg-gradient07c/dot.gif) | Red is under yelllow |
![bullet](_themes/fpg-gradient07c/dot.gif) | Purple is under red |
![bullet](_themes/fpg-gradient07c/dot.gif) | Black is under purple |
NDVI calculation is a modified version of the traditional NDVI
calculation which we call Enhanced NDVI or ENDVI. For this example, we used:
ENDVI = (Red + Green) - (2 * Blue )) / ((Red + Green) +
(2*Blue))
The reason for this is that both the Red (Infrared light) and
Green (Visible Green) should reflect light for a healthy plant. Blue is
normally absorbed by a healthy plant. By summing the Red (Infrared) and
Green channels together, we get a better signal than when just using the
infrared signal alone.
Stock Canon ELPH300 Camera |
MaxMax XNiteCanonELPH300NDVI |
Image Procesed |
![](Old_Web/images/Cameras/NDVI/IMG_0094.JPG)
|
![](Old_Web/images/Cameras/NDVI/IMG_0095.JPG)
|
![](Old_Web/images/Cameras/NDVI/IMG_0095_NDVI.JPG) |
![](Old_Web/images/Cameras/NDVI/IMG_0093.JPG)
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![](Old_Web/images/Cameras/NDVI/IMG_0091.JPG)
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![](Old_Web/images/Cameras/NDVI/IMG_0091_NDVI.JPG) |
![](Old_Web/images/Cameras/NDVI/IMG_0092.JPG)
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![](Old_Web/images/Cameras/NDVI/IMG_0090.JPG)
|
![](Old_Web/images/Cameras/NDVI/IMG_0090_NDVI.JPG) |
![](Old_Web/images/Cameras/NDVI/IMG_0087.JPG)
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![](Old_Web/images/Cameras/NDVI/IMG_0088.JPG)
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![](Old_Web/images/Cameras/NDVI/IMG_0088_NDVI.JPG) |
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