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Posted to issues@spark.apache.org by "Feynman Liang (JIRA)" <ji...@apache.org> on 2015/06/19 23:10:01 UTC

[jira] [Created] (SPARK-8491) DAISY Feature Transformer

Feynman Liang created SPARK-8491:
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             Summary: DAISY Feature Transformer
                 Key: SPARK-8491
                 URL: https://issues.apache.org/jira/browse/SPARK-8491
             Project: Spark
          Issue Type: Sub-task
          Components: ML
            Reporter: Feynman Liang


DAISY is another local image descriptor utilizing histograms of local orientation similar to SIFT. However, one key difference is that the weighted sum of gradient norms used in SIFT's orientation assignment is replaced by convolution with Gaussian kernels. This provides a significant speedup in computing dense descriptors.

We can implement DAISY in Spark ML pipelines as a org.apache.spark.ml.Transformer. Given an image Array[Array[Numeric]], the SIFT transformer should output an ArrayArray[[Numeric]] of the DAISY features for the provided image.

The convolution operation can leverage GPU parallelism for efficiency.



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