This is a testing site only. See the live Public Lab site here »


Multispectral imaging
upgrade:multispectral-imaging

The Public Lab near infrared imaging project is an open source community effort to modify consumer cameras to capture near infrared imagery for a range of purposes, including plant health. All open or accessible near infrared imaging hardware and software efforts are welcome here! **Join in by:** * Reading about goals and asking great questions * Converting a camera using one of our starter kits * Trying (and critiquing) our community-made how-to guides * Posting your own how-to guides and mods * Building on others’ work; hack and remix the kits to refine and expand them * (proposed?) Submit your improvements for inclusion in an upcoming starter kit release or add-on * (proposed?) Serve on a Research Review Group for a 3 month period ## Activities This is a list of community-generated guides for specific applications using your near-infrared imaging setup (either a camera you converted yourself with a filter pack, a ready-made near-infrared camera, or double camera setup). Some may be more reproduced -- or reproducible -- than others. Try them out to build your skills, and help improve them by leaving comments. Together, we can repeat and refine the activities into experiments. [activities:multispectral-imaging] Add your guide here Request a guide _Guides should include a materials list and a step-by-step construction guide with photo documentation. See an example._ **** ## Hardware Mods Have you added to your starter kit, improved it, or redesigned it? Show others how to take it to the next level by posting a build guide here: [upgrades:multispectral-imaging] Add your hardware modification here Request a hardware modification _Upgrades should include a parts list and a step-by-step construction guide with photo documentation. See an example._ **** ## Builds There’s a lot going on in open source near-infrared imaging -- if you’ve developed another open source design you’d like to show others how to construct, post it here! * Rasberry Pi NoIR * X * XX **** ## Choosing a tool / Starter Kits The question to start with is whether you can capture all the channels you need for your research question with a single converted camera or whether you should use a dual camera rig with one converted camera and one unconverted. That choice plays out in terms of what filter (blue or red) to use for converting your camera. Public Lab’s Kits initiative offers several starter kits, one with the basic components and instructions for converting your own digital camera to capture near-infrared imagery and a second option -- a readymade lightweight near-infrared camera. The point of the kits is to lower the barrier to capturing your own near-infrared imagery. * **The Infragram filter pack** is our least expensive way to get started with near-infrared imaging, but it does require an afternoon and some technical work to perform the camera conversion yourself. ... etc etc etc **[Visit the Infragram DIY filter pack]()** * **The Infragram point and shoot** is a Mobius camera that we worked with a factory to modify. ... etc etc etc **[Visit the Infragram Point&Shoot page](/wiki/infragram-point-shoot)** **** ## Processing near-infrared imagery 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. In-depth articles on the technique by Chris Fastie can be found here: * https://publiclab.org/wiki/ndvi * https://publiclab.org/wiki/ndvi-plots-ir-kit **** ## Software How to process your images: 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: * The **easiest way** is to process your images online at the free, open source [Infragram.org](http://infragram.org) * [Ned Horning's](/profile/nedhorning) [PhotoMonitoring plugin](/wiki/photo-monitoring-plugin) * Manual processing * [in Photoshop](/notes/warren/10-25-2011/video-tutorial-creating-infrared-composites-aerial-wetlands-imagery) * [or GIMP](/notes/warren/10-27-2011/video-tutorial-creating-false-color-ndvi-aerial-wetlands-imagery) * Command-line processing of single images and rendering of movies using a Python script: Source code is [here](https://github.com/Pioneer-Valley-Open-Science/infrapix) and here: [here](https://github.com/publiclab/infrapix) * For those who use the webcam and have a Python interpreter, there are some image processing codes available at [Python Webcam Codes](/wiki/python-webcam-codes) * Using MapKnitter.org (deprecated) **** ## Comparison to standard tools Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. For example, see this illustrated [PDF, page 210](http://www.beckshybrids.com/Portals/0/SiteContent/Literature/PFR%20Book%202010%20optimized%20small.pdf) from a commercial imagery provider who has been studying the usefulness of infrared imagery and has quotes from farmers who make use of it. There are public sources of infrared photography for the US available through the Department of Agriculture -- [NAIP](http://datagateway.nrcs.usda.gov/) and [Vegscape](http://nassgeodata.gmu.edu/VegScape/) -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. **** ## Frequently Asked Questions Ask a question about multispectral-imaging Get notified of new questions and help out [notes:question:multispectral-imaging] ...


Author Comment Last activity Moderation
CHUMBA "Hello @cfastie, thanks for your opinion it really help us out. We are so new on this issue, as I commented you on other talk we just broke a camera..." | Read more » over 7 years ago
cfastie "Hi CHUMBA, It looks like the Rosco 116 is a very good filter for NDVI. Compared to the 2007, it passes less red, has a steeper cutoff between red ..." | Read more » over 7 years ago
CHUMBA "Hi I have been testing with one particular filter wich is the 116 Medium Blue Gree, because the 2007 was not available for sale at the moment. I am..." | Read more » over 7 years ago
mathew "@Jimsford. you gotta print one! Shapeways could run one for you. " | Read more » over 7 years ago
jimsford "where can i get that from? " | Read more » over 7 years ago
fjcaceres "Chris On last thing on the Agribotix site is that they conclude the best filters are the blue ones Javier " | Read more » over 7 years ago
cfastie "@fgiorlando, I assume the Hoya 25A filters are just as good as Wratten 25A filters for infrared photography. The Hoya glass filters would produce c..." | Read more » over 7 years ago
cfastie "There seems to be a lot of marketing hooey at the Agribotix site. They seem to be doing DIY uncalibrated infrared vegetation index work like a lot ..." | Read more » over 7 years ago
fjcaceres "Because I don't really know much about filters, I came across this company named Agribotix that do NDVI and below the next paragraph is their expla..." | Read more » over 7 years ago
fgiorlando "Interesting stuff indeed, I have been lurking here for a while and trying to build a good documentary NDVI camera for a public gardening project. I..." | Read more » almost 8 years ago
eustatic "this is cool. thanks, chris " | Read more » about 8 years ago
cfastie "He didn't listen when they told Thomas Edison "You've tried enough filaments." He didn't listen when they told George Washington Carver "We don't n..." | Read more » about 8 years ago
warren ";-) can't we just choose a color and stick with it, Chris? " | Read more » about 8 years ago
patcoyle "Very nice use of 3D design and printing for a specific one-off project. Exemplary. " | Read more » almost 9 years ago
mathew "this is really cool. I made mine out of paper and tape " | Read more » almost 9 years ago