LDOP: Local Directional Order Pattern for Robust Face Retrieval
Shiv Ram Dubey, Snehasis Mukherjee

TL;DR
This paper introduces LDOP, a novel local descriptor for face retrieval that uses multi-scale directional relationships, offering improved robustness and lower dimensionality compared to existing methods.
Contribution
The paper proposes a new local descriptor, LDOP, which captures multi-scale directional order without increasing feature dimension, enhancing face retrieval performance.
Findings
LDOP outperforms state-of-the-art descriptors on multiple face datasets.
LDOP demonstrates robustness against challenging face variations.
The descriptor maintains low dimensionality regardless of neighborhood size.
Abstract
The local descriptors have gained wide range of attention due to their enhanced discriminative abilities. It has been proved that the consideration of multi-scale local neighborhood improves the performance of the descriptor, though at the cost of increased dimension. This paper proposes a novel method to construct a local descriptor using multi-scale neighborhood by finding the local directional order among the intensity values at different scales in a particular direction. Local directional order is the multi-radius relationship factor in a particular direction. The proposed local directional order pattern (LDOP) for a particular pixel is computed by finding the relationship between the center pixel and local directional order indexes. It is required to transform the center value into the range of neighboring orders. Finally, the histogram of LDOP is computed over whole image to…
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