Computer Vision Using Local Binary Patterns by Matti Pietikäinen

By Matti Pietikäinen

The contemporary emergence of neighborhood Binary styles (LBP) has resulted in major growth in utilizing texture how to a variety of computing device imaginative and prescient difficulties and purposes. the point of interest of this learn has broadened from 2nd textures to 3D textures and spatiotemporal (dynamic) textures. additionally, the place texture used to be applied for purposes equivalent to distant sensing, commercial inspection and biomedical photograph research, the advent of LBP-based methods have supplied awesome leads to difficulties when it comes to face and job research, with destiny scope for face and facial features attractiveness, biometrics, visible surveillance and video analysis.

Computer imaginative and prescient utilizing neighborhood Binary Patterns offers an in depth description of the LBP tools and their versions either in spatial and spatiotemporal domain names. This entire reference additionally presents a very good review as to how texture tools can be used for fixing other forms of computing device imaginative and prescient and photo research difficulties. resource codes of the fundamental LBP algorithms, demonstrations, a few databases and a finished LBP bibliography are available from an accompanying net site.

Topics include:

- neighborhood binary styles and their variations in spatial and spatiotemporal domains
- Texture type and segmentation, description of curiosity regions
- functions in photo retrieval and 3D recognition
- popularity and segmentation of dynamic textures
- historical past subtraction, popularity of actions
- Face research utilizing nonetheless photos and snapshot sequences, visible speech recognition
- LBP in a number of applications

Written by way of pioneers of LBP, this publication is a necessary source for researchers, specialist engineers and graduate scholars in laptop imaginative and prescient, photograph research and development acceptance. The e-book may also be of curiosity to all those that paintings with particular functions of laptop vision.

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Extra resources for Computer Vision Using Local Binary Patterns

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See Fig. 9 for an illustration with eight neighbors [23]. Furthermore, to increase the operator’s robustness in flat areas, the differences are thresholded at a typically non-zero threshold T . 25) where ni and ni+(N/2) correspond to the gray values of center-symmetric pairs of pixels of N equally spaced pixels on a circle of radius R. It should be noticed that the CS-LBP is closely related to gradient operator, because like some gradient operators it considers gray level differences between pairs of opposite pixels in a neighborhood.

The three planes illustrate color channels Instead of comparing the color components of pixels, Porebski et al. [58] considered color pixels represented by a vector when comparing neighboring pixels to the center pixel. Because there is no total order between vectors, they use a partial color order relation based on Euclidean distances for comparing their rank. As the result a single color LBP image is obtained instead of 6–9 provided by the OCLBP. Another popular way is to apply the ordinary LBP to different color channels separately.

1. 2 Derivation of the Generic LBP Operator Several years after its original publication, the local binary pattern operator was presented in a more generic revised form by Ojala et al. [53]. In contrast to the basic M. 1007/978-0-85729-748-8_2, © Springer-Verlag London Limited 2011 13 14 2 Local Binary Patterns for Still Images Fig. 1 Example of an input image, the corresponding LBP image and histogram Fig. 2 The circular (8, 1), (16, 2) and (8, 2) neighborhoods. The pixel values are bilinearly interpolated whenever the sampling point is not in the center of a pixel LBP using 8 pixels in a 3 × 3 pixel block, this generic formulation of the operator puts no limitations to the size of the neighborhood or to the number of sampling points.

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