Public Lab Wiki documentation



Image Sequencer



Image Sequencer is an online tool for image processing -- based on the idea of a storyboard. Each modification makes a new copy of the image, resulting in a series of images showing each step. It is designed for use in browsers, as well as on the Raspberry Pi. This project is supported in part by the NASA AREN project

Why

Image Sequencer is different from other image processing systems in that it's non-destructive: instead of modifying the original image, it creates a new image at each step in a sequence. This is because it:

  • produces a legible trail of operations, to "show your work" for evidential, educational, or reproducibility reasons
  • makes the creation of new tools or "modules" simpler -- each must accept an input image, and produce an output image
  • allows many images to be run through the same sequence of steps - batch processing
  • works identically in the browser, on Node.js, and on the command line

Read more in-depth on the Image Sequencer GitHub page.

Also see this great introduction by @ccpandhare.

diagram-workflows.png


Activities

Purpose Category Status Author Time Difficulty Replications
Prototype: filter map tiles in real-time in a browser with ImageSequencer (NDVI Landsat) - - @warren - - 0 replications: Try it »

Add an activity  or request an activity

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.


Questions

Title Author Updated Likes
Is it possible to calculate average NDVI in a picture using infragram's sand box? @Hala73 23 days ago
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 2 months ago
How can I identify bits of plastic from the beach in an image? @jlev 4 months ago

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NDVI

There's now an "NDVI" feature in MapKnitter -- a beta -- for converting the images you upload with the #NDVI equation. It's set up for red filters only right now, but more will come.

It uses Image Sequencer to do the conversion, which is temporary - your map is not affected, so think of it as a "filter" you can turn on.

Need help? Ask questions above!

How it looks:

Screen_Shot_2018-05-07_at_12.16.38_PM.png


ndvi image-compositing infrared image-processing image-analysis method

parent:infrared-software