Multispectral imaging
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
clinicaveterinariavivavet "I don't know much about NDVI Landsat, but if I talk about veterinary " | Read more » about 1 month ago
angelotibutan "Yes, using an infrared security camera from sites like Aliexpress is a feasible and cost-effective option for your project. It could indeed be simp..." | Read more » 3 months ago
Ag8n "Could you please give more details? Did some work with reflectance NIR spectrometry ( for polymer quantitation). It was much more involved than th..." | Read more » 6 months ago
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warren "wow the blue color of your image looks quite good. It could be interesting to take a picture of some grass or some vegetation that's more consisten..." | Read more » over 1 year ago
xose "You can use the pi-builder to embed it on a Raspberry pi. The software consists in a camera interface, the image sequencer and the infragram ;D ht..." | Read more » over 1 year ago
bhamster ":wave: Welcome @jdetka, and thanks for sharing! It's great to have you here. " | Read more » over 1 year ago
jdetka "Is there a way to run the infragram code locally on a PC? I'll be in a region that doesn't have internet but I still want to be able to analyze ima..." | Read more » over 1 year ago
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warren "If you open "camera settings" on the camera page you can adjust the white balance as described here: https://publiclab.org/notes/kauemv2/05-27-201..." | Read more » about 2 years ago
shahdharam7 "Hi warren, Thank you for your response. I have used PI camera as mentioned in the link below. https://store.publiclab.org/collections/diy-infrare..." | Read more » about 2 years ago
shahdharam7 "Hi Warren, Thank you for your reply. Image (2) and (4) are taken using infragram pi camera. The detailed description of the camera is mentioned i..." | Read more » about 2 years ago
warren "Sometimes different cameras use only one channel to focus, in order to work faster (less time combining channels before calculating). If they use t..." | Read more » about 2 years ago
warren "Hi, good questions! You may want to try doing a better white balance to try to get better signal from your images: https://publiclab.org/tag/white..." | Read more » about 2 years ago