Handcrafted features

Includes extractors that compute descriptors with a fixed algorithm, and Lambda for a custom function.

Object	output_dim	Notes
SIFT	128	SIFT descriptors
RootSIFT	128	SIFT with Hellinger normalization (default extractor)
Lambda	user-defined	wraps any custom function

Table of Contents

• SIFT
• RootSIFT
• Lambda