Night-time pedestrian classification with histograms of oriented gradients-local binary patterns vectors
- Author(s): Patrick Hurney 1 ; Peter Waldron 2 ; Fearghal Morgan 3 ; Edward Jones 1 ; Martin Glavin 1
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View affiliations
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Affiliations:
1:
Connaught Automotive Research Group, School of Electrical and Electronic Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway City, Ireland;
2: Intel Shannon, Dromore House, Shannon, Clare, Ireland;
3: School of Electrical and Electronic Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway City, Ireland
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Affiliations:
1:
Connaught Automotive Research Group, School of Electrical and Electronic Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway City, Ireland;
- Source:
Volume 9, Issue 1,
February 2015,
p.
75 – 85
DOI: 10.1049/iet-its.2013.0163 , Print ISSN 1751-956X, Online ISSN 1751-9578
The use of night vision systems in vehicles is becoming increasingly common, not just in luxury cars but also in the more cost sensitive sectors. Numerous approaches using infrared sensors have been proposed in the literature to detect and classify pedestrians in low visibility situations. However, the performance of these systems is limited by the capability of the classifier. This paper presents a novel method of classifying pedestrians in far-infrared automotive imagery. Regions of interest are segmented from the infrared frame using seeded region growing. A novel method of filtering the region growing results based on the location and size of the bounding box within the frame is described. This results in a smaller number of regions of interest for classification, leading to a reduced false positive rate. Histograms of oriented gradient features and local binary pattern features are extracted from the regions of interest and concatenated to form a feature for classification. Pedestrians are tracked with a Kalman filter to increase detection rates and system robustness. Detection rates of 98%, and false positive rates of 1% have been achieved on a database of 2000 images and streams of video; this is a 3% improvement on previously reported detection rates.
Inspec keywords: feature extraction; filtering theory; image segmentation; pedestrians; support vector machines; automobiles; infrared detectors; traffic engineering computing; image classification
Other keywords: low-cost infrared sensors; detection rates; seeded region growing; histogram of oriented gradient feature extraction; reduced false positive rate; support vector machine classifier; night vision systems; region of interest; bounding box; histogram of oriented gradient-local binary pattern vectors; RoF; captured infrared frame; high end luxury cars; far infrared automotive image streams; ROI; local binary pattern feature extraction; night-time pedestrian classification; filtering method; Kalman filter
Subjects: Image recognition; Computer vision and image processing techniques; Knowledge engineering techniques; Filtering methods in signal processing; Traffic engineering computing
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