jm + image   5

cool twitter image compression hack
Dаvіd Вucһаnаn on Twitter:
Assuming this all works out, the image in this tweet is also a valid ZIP archive, containing a multipart RAR archive, containing the complete works of Shakespeare. This technique also survives twitter's thumbnailer :P


(via JK)
via:johnke  cool  compression  image  jpeg  twitter 
17 days ago by jm
Fred's ImageMagick Scripts: SIMILAR
compute an image-similarity metric, to discover mostly-identical-but-slightly-tweaked images:
SIMILAR computes the normalized cross correlation similarity metric between two equal dimensioned images. The normalized cross correlation metric measures how similar two images are, not how different they are. The range of ncc metric values is between 0 (dissimilar) and 1 (similar). If mode=g, then the two images will be converted to grayscale. If mode=rgb, then the two images first will be converted to colorspace=rgb. Next, the ncc similarity metric will be computed for each channel. Finally, they will be combined into an rms value.


(via Dan O'Neill)
image  photos  pictures  similar  imagemagick  via:dano  metrics  similarity 
april 2013 by jm
Dr. Neal Krawetz explains perceptual hashing
ie. TinEye and other "images like this one" search engines. nice explanation
algorithm  images  analysis  programming  dct  hashing  perceptual-hash  tineye  via:hn  image 
june 2011 by jm
Semi-Realtime Satellite Desktop Backgrounds
Russ Garrett with another set of near-realtime desktop weather imagery (cf. http://taint.org/xplanet/ )
weather  desktop  image  satellite  realtime  backgrounds  from delicious
january 2010 by jm
iPhone Sudoku Grab: How does it all work?
lovely run-through of the computer-vision algorithms this iPhone app uses (via Waxy)
via:waxy  ai  image  programming  algorithms  graphics  iphone  ocr  computervision  opencv  sudoku 
august 2009 by jm

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