bytedeco/javacv

BowExtractor use?

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#1,571 opened on Jan 19, 2021

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Description

hey i m struggling with Bag Of Visual Words in java bytedeco ..i cant find any good example of using bag of visual words in java .i know how it works theoritically but dont know how to implement it currently using this but confused:

org.bytedeco.opencv.opencv_core.TermCriteria criteria = new  org.bytedeco.opencv.opencv_core.TermCriteria(TermCriteria.EPS +  TermCriteria.MAX_ITER,100,0.1);
           FastFeatureDetector features = FastFeatureDetector.create();
           BriefDescriptorExtractor ext = BriefDescriptorExtractor.create();
           DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);
           BOWKMeansTrainer bowTrainer = new BOWKMeansTrainer(dictionarySize, criteria, 1, Core.KMEANS_PP_CENTERS);
           BOWImgDescriptorExtractor de = new BOWImgDescriptorExtractor(matcher);

how to implement it properly ..steps by step. some provide me some guidance ?

Contributor guide

Research direction
Look for existing examples of Bag of Visual Words in the JavaCV repository or OpenCV Java documentation. Study the OpenCV C++ implementation and adapt it to Java using bytedeco types. Focus on using BOWKMeansTrainer and BOWImgDescriptorExtractor correctly.
Tech stack
java
Domain
machine learning
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaOpenCVComputer Vision
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65