|Title||URL||Last edited||Edits||Page Views||Likes|
|Infragram convertible cameras||/wiki/infragram-convertible-cameras||4 months ago by warren||92||4,540||8|
|Infragram||/wiki/infragram||10 months ago by warren||112||10,120||12|
|NDVI and NRG||/wiki/ndvi||11 months ago by warren||26||6,551||11|
|Camera Selection||/wiki/camera-selection||over 1 year ago by warren||19||1,028||2|
|White balance for NDVI cameras||/wiki/infrablue-white-balance||over 1 year ago by warren||14||862||3|
|Infrared Camera Conversion||/wiki/infrared-camera-conversion||over 1 year ago by warren||2||7||0|
The Infragram Kickstarter video, a great introduction to the project.
Vineyards, large farms, and NASA all use near-infrared photography for assessing plant health, usually by mounting expensive sensors on airplanes and satellites. At Public Lab, we've developed a Do-It-Yourself way to take these kinds of photos, enabling us to monitor our environment through quantifiable data.
Our technique uses a modified digital camera to capture near-infrared and blue light in the same image, but in different color channels. We then post-process the image (using Infragram.org) to attempt to infer how much it is photosynthesizing. This allows us to better understand and quantify how much of the available light plants are metabolizing into sugar via photosynthesis.
You can do this yourself (as with all Public Lab tools) but there is also an Infragram DIY Filter Pack available in the Public Lab Store.
Multispectral or infrared/visible photography has seen a variety of applications in the decades since it was developed. We have focused on the following uses:
Notable uses include this photograph of an unidentified plume of material in the Gowanus Canal (and writeup by TechPresident) and a variety of projects at a small farm in New Hampshire at the annual iFarm event. The Louisiana Universities Marine Consortium has also collaborated with Public Lab contributors to measure wetlands loss following the Deepwater Horizon oil disaster.
Here's an example of what one of our "Infragram" cameras sees (left) and the post-processing analysis which shows photosynthetic activity, or plant health (right). This picture was taken from a commercial airplane flight:
Camera modification: We've worked on several different techniques, from dual camera systems to the current, single-camera technique. This involves removing the infrared-blocking filter from almost any digital camera, and adding a specific blue filter.
This filters out the red light, and measures infrared light in its place using a piece of carefully chosen "NGB" or "infrablue" filter. Read more about the development of this technique here. You can also learn more about how digital camera image sensors detect colors at this great tutorial by Bigshot.
Post-processing: Once you take a multispectral photograph with a modified camera, you must post-process it, compositing the infrared and visible data to generate a new image which (if it works) displays healthy, photosynthetically active areas as bright regions. An in-depth article on the technique by Chris Fastie (albeit using red instead of blue for visible light) can be found here.
History of the project: While we used to use a two-camera system, research by Chris Fastie and other Public Lab contributors have led to the use of a single camera which can image in both infrared and visible light simultaneously. The Infrablue filter is just a piece of carefully chosen theater gel which was examined using a DIY spectrometer. You can use this filter to turn most webcams or cheap point-and-shoots into an infrared/visible camera.
The study of Earth's environment from space got its start in 1972 when the first Landsat satellite was launched. The multispectral scanner it carried, like the scanners on all subsequent Landsat satellites, recorded images with both visible and near infrared light. Remote sensing "scientists" quickly learned that by combining visible and infrared data, they could reveal critical information about the health of vegetation. For example, the normalized difference vegetation index (NDVI) highlights the difference between the red and infrared wavelengths that are reflected from vegetation. Because red light is used by plants for photosynthesis but infrared light is not, NDVI allows "scientists" to estimate the amount of healthy foliage in every satellite image. Thousands of "scientists", including landscape ecologists, global change biologists, and habitat specialists have relied on these valuable satellite-based NDVI images for decades.
There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots.
Caption: Normal color photo (top) and normalized difference vegetation index (NDVI) image. NDVI image was derived from two color channels in a single photo taken with a camera modified with a special infrared filter. Note that tree trunks, brown grass, and rocks have very low NDVI values because they are not photosynthetic. Healthy plants typically have NDVI values between 0.1 and 0.9. Images by Chris Fastie. Visit the gallery of high-res images by Chris Fastie
|How to calibrate the white-balance for NDVI using the BLUE filter?||@cagiva||3 months ago||0|
|I am getting very low NDVI values.||@Anice||4 months ago||1|
|Infragram Point and shoot photos: white balance not working||@Muneeswaran||4 months ago||0|
|Need insight on using this lens on modded camera for NDVI: OCN (Orange+Cyan+NIR) filter||@alanw||8 months ago||1|
|Best low cost camera for indoor plants?||@DrC||9 months ago||1|
|Is it possible to calculate average NDVI in a picture using infragram's sand box?||@Hala73||12 months ago||1|
|Problem with filter for Raspberry Pi NoIR Camera||@sjmanosalvas||about 1 year ago||0|
|Why do the plant colors look the way they do?||@jenhu||about 1 year ago||0|
|Which RGB channel is the near-infrared saved in for the red and blue filter?||@jenhu||about 1 year ago||0|
|Camera module for Computer Vision/LED Plant Measurement System||@SangHo||about 1 year ago||1|
|600 year old cedar tree - Infragram||@Randall||about 1 year ago||1|
|How can I can make a raspberry pi camera just with the filters process the crops and immediately produce the results to a computer or to other device, without having to use the website?||@csteran||about 1 year ago||1|
|How to make this picture in an NDVI image||@Davide_Ferrante||about 1 year ago||1|
|Add a filter on a Pi NoIR camera||@fsxskillz||about 1 year ago||1|
|How can I validate the NDVI images||@Aman007||about 1 year ago||0|
|buying Infragram filter pack in UK||@ruya||about 1 year ago||0|
|How to get NDVI image by image src instead of choosing image ?||@Ankita||about 1 year ago||1|
|Can these filter packages be adapted to Raspberry Pi cameras?||@sjmanosalvas||about 1 year ago||1|
|Visible Atmospherically Resistant Index (VARI)||@rway||over 1 year ago||1|
|Camera that would detect at 1064nm?||@jpschaaf||over 1 year ago||0|
|Can Infragrams be used to count coconuts/crop productivity?||@James_Vagabond||over 1 year ago||1|
|How can I have a value of NDVI starting from a IR picture? I want to find a numeric value of NDVI in pictures teken with a normal camera without IR filter. is it possible?||@giuliooooo||over 1 year ago||0|
|Can I use a Raspberry Pi with the Pi Noir camera to make NDVI images?||@warren||over 1 year ago||0|
|How big is the filter in the infragram DIY filter pack?||@robotfarms||over 1 year ago||0|
|I need a help I'm doing a research project on NVDI processes||@camiloreyes||over 1 year ago||0|
|AstroPlant RPi sensory system||@Sidney_AstroPlant||almost 2 years ago||2|
|"Test images" for multispectral image processing||@warren||almost 2 years ago||2|
|Transmission & other related information of the Red Filter||@suman||almost 2 years ago||0|
|What is the algorithm used in generating the fastie colormap from NDVI in Infragram?||@Jtaw||about 2 years ago||1|
|Can I use any red filter for capturing NIR light?||@sujayj||about 2 years ago||1|
|I would like to know why near infared imaging works, and what it does.||@kiramac||about 2 years ago||0|
|GoPro Hero HD first version- Making full spectrum( Removing IR filter)||@suman||over 2 years ago||1|
|Can you process multiple images at the same time?||@JonathanM32||over 2 years ago||1|
|PublicLab Mobius calibration||@dbehr||over 2 years ago||0|
|Video Infragram||@jfd||over 2 years ago||1|
|Query about Infragram DIY Filter Pack ( blue & red filter)||@suman||over 2 years ago||0|
|Question infragram kit||@marfisistemidroni||over 2 years ago||0|
|What is the ideal white balance for the Infragam Point and Shoot?||@abdul||over 2 years ago||1|
|Can anyone help me troubleshoot my NDVI imagery?||@abdul||over 2 years ago||0|
|How to process images using a mobius with an IR lens?||@miguel_rosas||over 2 years ago||1|
|MobiusActionCam vs S100||@ashwinvasudevan||over 2 years ago||0|
|what are the requirements of a camera for Filter replacement and NDVI imaging?||@Ajith_Kumar||over 2 years ago||1|
|loading the proper camera driver for the DSK webcam||@Winter||over 2 years ago||1|
|Correct Config. File & Trobule shooting2||@will123||over 2 years ago||1|
|Don't know how to use DIY Plant Analysis Webcam||@Barabba33||over 2 years ago||0|
|Infragram Point and Shoot Plant Cam||@alexrfholland||over 2 years ago||0|
|Question: Infragram point & shoot image||@ino||almost 3 years ago||1|
|How can one Infragram photo produce different NDVI results?||@cfastie||over 3 years ago||2|
|Question: how to calculate NDVI||@rajsan1108||over 3 years ago||1|
|What is the correct interpretation for the NDVI infragram color scale?||@DuvTorres||almost 4 years ago||1|
|Modified camera with 25A red filter - NDVI needs calibration- Any Ideas?||@Tbtouaki||over 4 years ago||1|
|First Infragram cam trials - Primeros ensayos con cámaras Infragram||@ivalethia||over 4 years ago||0|
|Question: retrieving true color image from infragram images||@brooksdr||over 4 years ago||0|
|Will Infragram help with Indoor Hydroponics/Aquaponics?||@ajawitz||over 5 years ago||1||Show more|
(this section is moved to and updated at http://publiclab.org/wiki/near-infrared-imaging)
We're working on an easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis. There are several approaches:
Note: Older versions of this page have been kept at the following wiki page: http://publiclab.org/wiki/near-infrared-camera-history