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CIR Emulation

 

 

CCD and CMOS image sensors only see black and white.  In order for the camera to see color, small color filters are printed on top of the image sensors.  These filters are typically arranged in a Bayer pattern.

Below is the typical response curve for CCD and CMOS image sensors.  The top dark blue channel shows the quantum efficiency of an unfiltered image sensor.  The Red, Green and Blue traces show the transmission response after the light passes through the mosaic color filter over the image sensors.

 

When we convert a camera to see IR+Visible or IR-Only, the majority of the infrared data will come in on the red channel.  Interestingly, the blue and green channels will see some infrared but will be much lower than the red channel.

Below is shown a chart showing the typical sun emission spectral curve, human sensitivity curve and silicone sensitivity curve.  CCD and CMOS sensors use Silicon has a component.

 

 

 

               

                                

 

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Last modified: January 09, 2008