sift - Capturing macro and micro geometry using image features -


i extracting image features texture identification. want extract image features 2d image. these features should capture micro macro geometry of image. have tried find out algorithm can give me above result. tried sift captures details of macro geometry, shape , edge details. on other hand have tried various versions of lbp (like cs-lbp, lnbp etc) can capture pixel differences , not overall scheme of things. technique tried using glcm different distance , orientation values . still there problem resulting histogram large , time taken comparison large. additionally, results not also. classification rate svm 48%. can guide me in finding generic algorithm can capture pixel level differences overall texture pattern.

why need generic algorithm? have:

  1. local non parametric features (like lbp) capture micro
  2. macro features (like corner detectors, sift)
  3. overall geometry invariant statistics (like histograms, fourier transform etc)

just calculate features, concatenate them in single vector , vector result wanted. don't need single smart algorithm. key success combination (concatenation) of many "simple" algorithms.

if have speed problems (your vector of features long) try using pca before svm. reduce size of vector in such way loose "minimal amount of information". pca can reduce length of vector factor of 10 easily. pca running time relatively fast (just multiplying 2d matrix).

if still have low recognition rates when sure used features try itml. itml used after pca , multiplication 2d matrix. itml way "normalize affection of each feature , cancel out affect of feature's large or small range of values".

typically if use features, run pca, itml , svm - should results on difficult computer vision tasks


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more