Camera Trajectory Optimization for Maximizing Optical Character Recognition on Static Scenes with Text⁎This work was supported by the National Science Foundation under Grant 1662029. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Issue 20 (2021)

• Record Type: Journal Article
• Authors: Zabaldo, Alexander; Ueda, Jun
• Is Part Of: IFAC-PapersOnLine. Volume 54:Issue 20(2021)
• Page Start: 801
• Page End: 806
• Publication Date: 2021
• Subjects: Path Planning -- Motion Control -- Modeling -- Identification -- Signal Processing -- Control Applications; Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2021.11.270
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: Camera systems in motion are subject to significant blurring effects that lead to a loss of information during the image capture. This is especially damaging for optical character recognition for which edge preservation is critical to achieving a high recognition rate. Using non-blind motion deblurring, a trajectory and point spread function can be designed to maximize the recognition rate while meeting endpoint constraints. Optimization through the use of radial basis function networks can therefore be used as a way to find ideal trajectories to reduce blurring effects and preserve text sharpness. This paper investigates this problem using simulation of a blurred image capture process. The simulation is automated using radial basis function network optimization and a genetic algorithm to determine trajectories with the best recognition rate. Optimized trajectories yielded recognition scores with up to 65% improvement compared to a comparable linear profile. Results are then analyzed using spectral analysis to understand why the chosen trajectories preserve text edges. These findings can be applied to a wide variety of controlled mobile camera platforms, such as autonomous automobiles or unmanned aerial vehicles, to improve their ability to gather information from their environment.