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6/21/2018 NDVI

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ArduCAM NOIR Raspberry Pi camera with

Motorized IR Cut Filter

Posted on August 12, 2017

Contents [hide]

1 Background

2 Motorized (Switchable) infrared-cut filters

3 Solution

4 Software Download

Background

Raspberry pi camera has both color version pi camera board and NoIR version pi camera board.

So let’s take a look at the difference between these two types of camera. The color version pi

camera has 650nm IR cut filter on top of the sensor, so it can only sensitive to visible light like

human eyes. While the NoIR version pi camera also called IR filter removed pi camera which

doesn’t have 650nm IR cut filter on top of the sensor, and can sensitive all spectrum of light

including ultraviolet light and near infrared light which cannot be seen by humans. So people will

think NoIR pi camera is better than the standard color pi camera, because it is sensitive to all

spectrum rather than visible light. Yes, it is good, but it depends. The problem of this effect is that

the color reproduction is drastically affected.

Unlike your eyes, camera sensors can detect “near infrared” light that just outside the range of the

human eye. The image below shows the result.

The plants in this view reflect more infrared than green light so they appear pink in daylight.

To make the image more akin to what humans can see, most cameras are fitted with an infrared-

Summary of content (4 pages)

PAGE 1
6/21/2018 NDVI ArduCAM NOIR Raspberry Pi camera with Motorized IR Cut Filter Posted on August 12, 2017 Contents [hide] 1 Background 2 Motorized (Switchable) infrared-cut filters 3 Solution 4 Software Download Background Raspberry pi camera has both color version pi camera board and NoIR version pi camera board. So let’s take a look at the difference between these two types of camera.
PAGE 2
6/21/2018 NDVI cut filter which only allows visible light to pass through, reflecting unwanted infrared. This is where standard color version pi camera used for. Motorized (Switchable) infrared-cut filters There are some instances where capturing infrared light is an advantage. In low-light conditions, cameras capture as much light as possible to produce brighter images, regardless of color.
PAGE 3
6/21/2018 NDVI — ArduCAM pi camera with motorized IR cut filter First we have to edit the config.txt file 1 sudo nano /boot/config.txt Add this line at the end of the config.txt file, save and reboot. 1 disable_camera_led=1 Then use our provide python script to take normal image with IR-cut on and night vision image with IR-cut off. Using the following commands there are two pictures captured. 1 2 3 cd piCamLed sudo python ./RPI_camera_IR_CUT_NOIR.py sudo python ./RPI_camera_IR_CUT_IR.
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6/21/2018 NDVI Software Download Demo software can be downloaded from here. This entry was posted in Camera Module Demonstration and tagged NoIR, NDVI, IRCUT by Lee Jackson. Bookmark the permalink [http://www.arducam.com/arducam-noir-raspberry-picamera-motorized-ir-cut-filter/] . http://www.arducam.