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](/pi-camera). This project is supported in part by the [NASA AREN project](/aren) ## 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](https://github.com/publiclab/image-sequencer/blob/master/CONTRIBUTING.md) * 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 [See this great introduction](/notes/ccpandhare/03-18-2017/developing-image-sequencer-as-a-library) by @ccpandhare. Read more in-depth on the [Image Sequencer GitHub page](https://github.com/publiclab/image-sequencer). Check out the Image Sequencer User Manual by @MaggPi: https://github.com/MargaretAN9/GSOC-2019/blob/master/ImageSequencerUserManual.md [](https://publiclab.org/system/images/photos/000/023/784/original/diagram-workflows.png) **** ## Activities [activities:image-sequencer] **** ## Questions [questions:image-sequencer] **** ## 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:  ...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| amirberAgain | "Another ask/ suggestion would be to image using black/uv light, most plastics would show strong signs of fluorescence which might help descriminati..." | Read more » | almost 7 years ago | |||
| jlev | "Thanks @amirberAgain. I've contacted my friend at Greenpeace and asked him for some more images with less overlap and a wider array of lighting con..." | Read more » | almost 7 years ago | |||
| amirberAgain | "Code: https://drive.google.com/file/d/1HDekiO0l9DEmSBmbWBVOEEPvSkys6AUa/view?usp=sharing " | Read more » | almost 7 years ago | |||
| amirberAgain | "I tried to apply the same simplistic approach as was in the particle image. Not sure why, but Sobel didn't work, but Canny did. Other than that - t..." | Read more » | almost 7 years ago | |||
| amirberAgain | "Could you upload a few more image samples? Is it possible to ask that the samples be illuminated from a wide light source such that shade will be k..." | Read more » | almost 7 years ago | |||
| warren | "What might be the processing steps, to try to break this down? Could they look like some of the steps @SimonPyle, @AmberWise, @damarquis and @amirb..." | Read more » | almost 7 years ago | |||
| warren | "Ooh! @maxliboiron maybe you know something about this? I have to dig through some old emails to find someone else who's mentioned this to me too. " | Read more » | almost 7 years ago | |||
| Endure1 | "Is this conversion the reason a dual camera setup doesn't necessarily require calibration? " | Read more » | almost 7 years ago | |||
| cfastie | "The text file attached above gives the correct RGB values for the NDVI_VGYRM lookup table. I put an image of the NDVI_VGYRM color gradient in my an..." | Read more » | over 7 years ago | |||
| Jtaw | "update : I used the lookup table above and did not give me a good result. I hope it is not the colormap used by infragram and there is something el..." | Read more » | over 7 years ago | |||
| Jtaw | "The lookup table will do for me. I'll try to generate an equation from this one. thanks a lot! " | Read more » | over 7 years ago | |||
| cfastie | "I think the algorithm to convert a blue- or red-filtered NIR photo to color NDVI is something like this: Start with a color photo in which one ch..." | Read more » | over 7 years ago |