Local Binary Patterns (LBP)

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Presentation transcript:

Local Binary Patterns (LBP) Tsung-Yi Wu

Concept Divide the examined window to cells (e.g. 16x16 pixels for each cell). For each pixel in a cell, compare the pixel to each of its 8 neighbors (on its left-top, left-middle, left-bottom, right-top, etc.). Follow the pixels along a circle, i.e. clockwise or counter-clockwise.

Concept Where the center pixel's value is greater than the neighbor, write "1". Otherwise, write "0". This gives an 8-digit binary number (which is usually converted to decimal for convenience). Compute the histogram, over the cell, of the frequency of each "number" occurring (i.e., each combination of which pixels are smaller and which are greater than the center).

Concept Optionally normalize the histogram. Concatenate normalized histograms of all cells. This gives the feature vector for the window.

Concept LBP Operations

Concept Illustration

Multi-scale Block LBP Shengcai Liao et al.

Face Description The basic methodology for LBP based face description proposed by Ahonen et al. (2006) is as follows: The facial image is divided into local regions and LBP texture descriptors are extracted from each region independently. The descriptors are then concatenated to form a global description of the face

Face Recognition with LBP Steps Build Gallery LBP Histograms Build the Probe LBP Histogram Histogram The recognition is performed using a nearest neighbor classifier in the computed feature space with Chi square as a dissimilarity measure.

Face Recognition with LBP Gallery and Probe Pictures

Face Recognition with LBP Gallery and Probe Pictures

Face Recognition with LBP Face Recognition with Decision Tree-based Local Binary Patterns

Histogram Matching Many similarity measures for histogram matching have been proposed histogram intersection is used to measure the similarity between two histograms

Histogram Matching Chi square as a dissimilarity measure Log-likelihood statistic Weighted X 2

References http://en.wikipedia.org/wiki/Local_binary_patterns http://www.scholarpedia.org/article/Local_Binary_Patterns http://en.wikipedia.org/wiki/Local_binary_patterns Learning Multi-scale Block Local Binary Patterns for Face Recognition Face Recognition with Decision Tree-based Local Binary Patterns Local Derivative Pattern Versus Local Binary Pattern: Face Recognition With High-Order Local Pattern Descriptor