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Image Analysis
image-analysis

##Infrared compositing## If you have [near-infrared imagery](/tool/near-infrared-camera) you can composite that imagery with the visible-light imagery to see how healthy the vegetation is. * [NDVI and NRG compositing](/wiki/ndvi) * [Video: Creating infrared composites of aerial wetlands imagery](https://www.youtube.com/watch?feature=player_embedded&v=pv6xB0y-rX4) - Learn to combine infrared and visible-light photographs (taken from balloon photography) to produce an "NRG" composite, where reddish color indicates photosynthesis. * [Video: Creating false-color NDVI with aerial wetlands imagery](https://www.youtube.com/watch?v=-nNnWEHNO_w) - Learn to use the open-source GIMP application to create a Normalized Differential Vegetation Index image from infrared and visible-light aerial photographs. Also explore false-color techniques for presenting the data. ##Contrast adjustments## Stretch the contrast and saturation of your images to see more detail, especially underwater. Read more here: * http://publiclaboratory.org/notes/warren/10-25-2011/using-colorcontrast-enhancement-see-water-aerial-photos ###Decorrelation stretching### _Nathan Craig writes:_ Decorrelation stretching may be a method to consider. Various flavors of the transformation are easily run using the DStretch Plugin for Image J. Several that seemed to represent variability relevant to the case study are included. I use DStretch to help bring out detail in rock art scenes that are highly eroded. However, the method has utility outside of rock art studies. It may be an additional approach to consider when trying to identify pollution or other contaminants. Here is information on DStretch http://www.dstretch.com/ Here is a paper that describes the transformation http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/docs/ASTER/atbd-ast-06.pdf [Browse more of these](https://www.flickr.com/photos/publiclaboratory/sets/72157627992773600/detail/) ##Classification## Using the ratios of Red, Green, and Blue (and possibly Near-infrared), spectral classification attempts to categorize regions of an image by land type. ###Read more on the [classification page »](/wiki/classification)### ### Image Analysis [activities:image-analysis]...


Author Comment Last activity Moderation
xose "Impressive Jeff. As soon as we check the outcome, this analysis will be carried on the pictures obtained ;) " | Read more » over 4 years ago
warren "@xose check this prototype out for your river timelapse project... Very crude but interesting? " | Read more » over 4 years ago
stevie "Hi @SimonPyle hope all is well! Wanted to connect you to @tech4gt who is working on a process like this for microscope slide images. Here's a post ..." | Read more » over 4 years ago
ccpandhare "Great! Ping me when you want to version bump. Or if you'd like I can see if i can give you permissions for this? If you think that's appropriate :..." | Read more » about 5 years ago
warren "Maybe we should move some of the extra links to the bottom of the document, and lead with the introduction, to make it more readable? " | Read more » about 5 years ago
warren "Great! Ping me when you want to version bump. Or if you'd like I can see if i can give you permissions for this? " | Read more » about 5 years ago
ccpandhare "Made requested changes. " | Read more » about 5 years ago
ccpandhare "npm install -g image-sequencer should work after we give a version bump on npm. " | Read more » about 5 years ago
warren "One more thing -- for the CLI, can people just run npm install -g image-sequencer? " | Read more » about 5 years ago
warren "This is super. Maybe "Code Links and Statistics" could go at the end? What if we better highlighted: places to start contributing (FTOs, etc) wi..." | Read more » about 5 years ago
ccpandhare "Hello @warren @ananyo2012 I have made changes according to your suggestions. Thanks for your valuable time. I would appreciate if you could have an..." | Read more » about 5 years ago
ccpandhare "Yes, will push to the gh-pages now Thanks a lot for your suggestions @warren and @ananyo2012 I will look into this and make changes accordingly :-) " | Read more » about 5 years ago
warren "This may be of interest to lots of people doing image processing across the world. Think about how this writeup could also be an introduction to pe..." | Read more » about 5 years ago
warren "One more thought -- do you think you could show with a few screenshots how the sequencer works? I think that'd be a nice way to introduce people to..." | Read more » about 5 years ago
warren "Also, let's get the main publiclab github pages demo up and running, no? Great!! " | Read more » about 5 years ago
ananyo2012 "@ccpandhare Good work. The demo looks good. Can you also add link to any FTO issues you made? " | Read more » about 5 years ago
SimonPyle "@warren: The link above was the most recent version, though I just added a GNU GPLv3 license and created a github repository: https://github.com/si..." | Read more » over 5 years ago
mathew "There is a large folder of sample image sets avaialble. I put a smaller set together here: https://publiclab.org/notes/mathew/10-07-2016/sizing-ima..." | Read more » over 5 years ago
mathew "You can see more about the shape descriptors for each particle here: https://publiclab.org/notes/mathew/09-19-2015/using-imagej-to-process-passive-..." | Read more » over 5 years ago
mathew "The image analysis creates: perimeter of each particle area of each particle circularity of each particle Circularity is the ratio between the..." | Read more » over 5 years ago
warren "Is there any sample input/output sets from going through this process, manually or automatically? I was thinking that a good test/spec might inclu..." | Read more » over 5 years ago
warren "Hi! Just re-reading, is it right that the image analysis produces (as it's complete output): perimeter of each particle area of each particle ..." | Read more » over 5 years ago
warren "Hi! Is Simon's macro still at the URL listed above? Or is there a more up-to-date version, potentially open sourced? Thanks! " | Read more » over 5 years ago
mathew "Followup on automating this process https://publiclab.org/notes/SimonPyle/05-13-2016/automating-imagej-for-particle-image-analysis " | Read more » over 6 years ago