Estimation of homography dynamics on the special linear group

Ezio Malis*, Tarek Hamel, Robert Mahony, Pascal Morin

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    During the last decade, a number of highly successful visual servo control and real-time image processing algorithms have been proposed that use the homography between images of a planar scene as the primary measurement. The performance of the algorithms depends directly on the quality of the homography estimates obtained, and these estimates must be computed in real-time. In this chapter, we exploit the special linear Lie group structure of the set of all homographies to develop an on-line dynamic observer that provides smoothed estimates of a sequence of homographies and their relative velocities. The proposed observer is easy to implement and computationally undemanding. Furthermore, it is straightforward to tune the observer gains and excellent results are obtained for test sequences of simulation and real-world data.

    Original languageEnglish
    Pages (from-to)133-150
    Number of pages18
    JournalLecture Notes in Control and Information Sciences
    Publication statusPublished - 2010


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