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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: * * **** ## 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 []( * [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]( and here: [here]( * 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 (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]( 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]( and [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
Hala73 "Thanks for that, I'll give it a try and let you know how it worked " | Read more » over 5 years ago
Hala73 "I'll give it a try then, thanks! " | Read more » over 5 years ago
warren "We're developing a new system based on Infragram, which is more systematic, and can output things like averages, etc. We're testing this out now an..." | Read more » over 5 years ago
warren "Hi, @Hala73 - Fiji can be installed on a mac, actually -- and ImageJ (same app) on Linux. " | Read more » over 5 years ago
Hala73 "Thank you, these are plugins for PC but I'll look for something similar that works on a mac. " | Read more » over 5 years ago
cfastie "I don't think calculations at can be used for anything but determining the color of a new image. The Photo Monitoring plugin and Fiji..." | Read more » over 5 years ago
cfastie "There is no information at the Public Lab store about what filter is used except that it is a red filter. I suspect the filter is a Rosco `#19 filt..." | Read more » over 5 years ago
RexToother "Sorry, I thought that was going to be posted directly to the product page. Here is the link to it:" | Read more » over 5 years ago
warren "Hi, just curious which lens you're referring to? Thanks! " | Read more » over 5 years ago
warren "Ah! Flashback! " | Read more » over 5 years ago
warren "I guess to evaluate how well the 2x blue boost I posted above worked, we'd have to compare it to a better system, right? If other folks take a phot..." | Read more » over 5 years ago
cfastie "I have tried several times to adjust the histogram of bad infrared photos. It has always failed and I don't know why. I assume it is because the ad..." | Read more » over 5 years ago
warren "Hmm, could we manually multiply the blue channel by 2 or 3 to do a "post-processed white balance"? Of course this would need to be calibrated, but ..." | Read more » over 5 years ago
cfastie "A single camera NDVI system with a red filter should produce a photo with very turquoise foliage. The blue channel (NIR) should be much brighter th..." | Read more » over 5 years ago
warren "Incandescent white balance seems to work all right! But wait, here it is in NDVI using -- black is zero NDVI, white is 1.0: ..." | Read more » over 5 years ago
PhillipLyons "I have seen it on Youtube, A guy was doing it. I can't remind of the link. But you can definitely try Youtube buddy. " | Read more » over 5 years ago
warren "@amanda and I did a take apart session and this is pretty easy to do with a good pair of pliers -- wire strippers worked well! " | Read more » over 5 years ago
rjun86 "thanks for ur answer sadly while trying to remove those 3 screws i shredded stripped those screws head if u want i can post its picture before tha..." | Read more » over 5 years ago
cfastie "First, mark the position of the three screws. When you remove them, count the number of rotations needed to unscrew them. So you will need marks on..." | Read more » over 5 years ago
jdburnett "@dannysmith Your use of the ILS seems sound. Your work will certainly be more defensible if you can use Pagnutti' et. al's method, however, it may..." | Read more » over 5 years ago
nedhorning "Setting up and running an integrating sphere is within your reach for a 12 week course as long as the equipment is working and you have access to s..." | Read more » over 5 years ago
dannysmith "@nedhorning I think you're right about the expecting the unexpected with this camera, when I get back to the lab later in the week I'll run a trial..." | Read more » over 5 years ago
jdburnett "Ned's last comment reminded me of something I found with our equipment a few years ago. My lab had 4 NIR converted cameras. Three had R & IR p..." | Read more » over 5 years ago
jdburnett "@dannysmith I will second Ned's thoughts. I assume you are using raw image format out of your camera to increase bit depth and avoid dealing with t..." | Read more » over 5 years ago