Detecting change in images with parallax

Mark J. Carlotto

doi:10.1117/12.721148

7 May 2007 Detecting change in images with parallax

Mark J. Carlotto

Proceedings Volume 6567, Signal Processing, Sensor Fusion, and Target Recognition XVI; 656719 (2007) https://doi.org/10.1117/12.721148
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

The ability to detect significant change in images is reduced when there is parallax. Fixed objects above or below the ground plane displace from their true position by an amount that depends on their height and the look angle of the sensor, reducing background cancellation and limiting the effectiveness of change detection. A method for reducing the effect of parallax shifts using dynamic time warping (DTW) to align images along the epipolar direction is described. A performance model is developed for predicting the processing gain of change detection (CD) over single image object detection as a function of the parallax. The model is used to predict CD performance with, and without DTW. A 10x improvement in processing gain is demonstrated on optical imagery, which results in a significant reduction in the number of false alarms.

Citation Download Citation

Mark J. Carlotto "Detecting change in images with parallax", Proc. SPIE 6567, Signal Processing, Sensor Fusion, and Target Recognition XVI, 656719 (7 May 2007); https://doi.org/10.1117/12.721148

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