Implement image comparison

[FoxxMD]

When

• Using attribution, repeat, or recent activity
• AND using submission as reference
• AND submission is an image

Implement a way to compare submission image to images from submissions in history.

Notes:

• What library?
  • Resemble.JS
  • Requires node-canvas binary
  • Rembrant.JS
  • Requires node-canvas binary
  • pixelmatch
  • Can't compare images with different dimensions
  • matches-subimage
  • Based on pixelmatch but can handle different sizes
• Need to determine if submission URL is an image
  • MIME type of downloaded resource?
  • By extension ending?

[FoxxMD]

Now using pixelmatch and sharp for all image comparisons.

This works for very in-depth comparisons but should look into implementing a perceptual hash approach so results can be stored/cached in order to scale better.

• https://devdojo.com/natkunamparthipan/detect-duplicate-images-with-in-node
  • https://github.com/LinusU/blockhash-core
• https://stackoverflow.com/a/1075916/1469797
• https://github.com/aaronm67/node-phash
• https://redaktor.me/phasher/demo_js/index.html