EL: Local Image Descriptor Based on Extreme Responses to Partial Derivatives of 2D Gaussian Function

Author:

Maver Jasna1ORCID,Skočaj Danijel1ORCID

Affiliation:

1. Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia

Abstract

We propose a two-part local image descriptor EL (Edges and Lines), based on the strongest image responses to the first- and second-order partial derivatives of the two-dimensional Gaussian function. Using the steering theorems, the proposed method finds the filter orientations giving the strongest image responses. The orientations are quantized, and the magnitudes of the image responses are histogrammed. Iterative adaptive thresholding of histogram values is then applied to normalize the histogram, thereby making the descriptor robust to nonlinear illumination changes. The two-part descriptor is empirically evaluated on the HPatches benchmark for three different tasks, namely, patch verification, image matching, and patch retrieval. The proposed EL descriptor outperforms the traditional descriptors such as SIFT and RootSIFT on all three evaluation tasks and the deep-learning-based descriptors DeepCompare, DeepDesc, and TFeat on the tasks of image matching and patch retrieval.

Funder

Javna Agencija za Raziskovalno Dejavnost RS

Publisher

Hindawi Limited

Subject

General Engineering,General Mathematics

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