java - Using pHash to search agaist a huge image database, what is the best approach? -


i need search huge image database find possible duplicate using phash assuming image records have hash code generated using phash.

now have compare new image , have create hash using phash against existing records. per understanding has comparison not straight forward like

hash1 - has2 < threshold

looks need pass both hash codes phash api matching.so have retrieve hash codes db in batches , compare 1 one using phash api.

but looks not best approach if have 1000 images in queue compared against millions of exiting images.

i need know followings.

  1. is understanding/approach on using phash compare existing image db correct?
  2. is there better approach handle (without using cbir libraries lire)?
  3. i heard there algorithm called dhash can used image comparison hash codes..is there java libraries , can used phash optimize task of large image , repeated image processing tasks.

thanks in advance.

i think part of question discussed on phash support forum.

you need use mvptree storage mechanism

http://lists.phash.org/htdig.cgi/phash-support-phash.org/2011-may/000122.html , http://lists.phash.org/htdig.cgi/phash-support-phash.org/2010-october/000103.html


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