ELPH 300 Examples
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
|Red = Near Infared|
|Green = Visible Green Light|
|Blue = Visible Blue Light|
Processed images were created with ImageJ and our custom aNDVI7_MKII macro which maps NDVI values to various colors where
|Green is highest NDVI value|
|Yellow is under green|
|Red is under yelllow|
|Purple is under red|
|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