Real-time computation of moment invariants combined with contrast stretching

A. L.C. Barczak*, Napoleon H. Reyes, T. Susnjak, M. J. Johnson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review


There is a large body of evidence that demonstrates the practicable use of moment invariants in real-time computer vision applications. Object detection, recognition and tracking are some of them, to name a few. However, the efficacy of moment invariants is highly susceptible to varying illumination conditions, which is inherent in real-world applications. Contrast stretching alleviates the problem, but performing contrast stretching prior to the calculation of moment invariants is computationally intensive and not suitable for real-time use. We address this problem by proposing an efficient real-time method that integrates the calculation of moment invariants up to the 4th order with a contrast stretching operation (all in one go), by utilising Summed-Area Tables (SATs). The method is limited to general contrast stretching, not necessarily covering very distinct illumination sources from different directions; that is, illumination conditions that create extra strong edges. We test the proposed method with a popular benchmarking image database (Amsterdam Library of Object Images) that is publicly available. Such images were acquired in a controlled environment, demonstrating varying lighting conditions. We show empirically that the method works in real-time and accurate enough for practical object detection applications.

Original languageEnglish
Title of host publication19th European Signal Processing Conference (EUSIPCO)
Number of pages5
Publication statusPublished - 2011
Externally publishedYes
Event19th European Signal Processing Conference, EUSIPCO 2011 - Barcelona, Spain
Duration: 29 Aug 20112 Sept 2011
Conference number: 19th

Publication series

NameEuropean Signal Processing Conference
ISSN (Print)2219-5491


Conference19th European Signal Processing Conference, EUSIPCO 2011
Abbreviated titleEUSIPCO
OtherEUSIPCO‐2011 has focused on key aspects of signal processing theory and applications. Acceptance of submissions has been based on quality, relevance and originality. Accepted papers have been published in these EUSIPCO proceedings and presented during the conference. Paper submissions, proposals of tutorials and proposals for special sessions have been invited in, but not limited to, the following areas of interest.

Audio and electro-acoustics
Design, implementation, and applications of signal processing systems
Multimedia signal processing and coding
Image and multidimensional signal processing
Signal detection and estimation
Sensor array and multi‐channel signal processing
Sensor fusion in networked systems
Signal processing for communications
Medical imaging and image analysis
Non‐stationary, non‐linear and non‐Gaussian signal processing
Speech processing
Internet address


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