Real-Time Straight-Line Detection for XGA-Size Videos by Hough Transform with Parallelized Voting Procedures
Hiroshima University, 1-3-1 Higashi-Hiroshima, Hiroshima 739-8530, Japan
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Sensors 2017, 17(2), 270; https://doi.org/10.3390/s17020270
Received: 31 October 2016
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Accepted: 20 January 2017
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Published: 30 January 2017
(This article belongs to the Special Issue Video Analysis and Tracking Using State-of-the-Art Sensors)
The Hough Transform (HT) is a method for extracting straight lines from an edge image. The main limitations of the HT for usage in actual applications are computation time and storage requirements. This paper reports a hardware architecture for HT implementation on a Field Programmable Gate Array (FPGA) with parallelized voting procedure. The 2-dimensional accumulator array, namely the Hough space in parametric form (ρ, θ), for computing the strength of each line by a voting mechanism is mapped on a 1-dimensional array with regular increments of θ. Then, this Hough space is divided into a number of parallel parts. The computation of (ρ, θ) for the edge pixels and the voting procedure for straight-line determination are therefore executable in parallel. In addition, a synchronized initialization for the Hough space further increases the speed of straight-line detection, so that XGA video processing becomes possible. The designed prototype system has been synthesized on a DE4 platform with a Stratix-IV FPGA device. In the application of road-lane detection, the average processing speed of this HT implementation is 5.4ms per XGA-frame at 200 MHz working frequency.
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Keywords:
Hough Transform; 1-dimensional Hough space; synchronized initialization; video-based straight lines detection
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MDPI and ACS Style
Guan, J.; An, F.; Zhang, X.; Chen, L.; Mattausch, H.J. Real-Time Straight-Line Detection for XGA-Size Videos by Hough Transform with Parallelized Voting Procedures. Sensors 2017, 17, 270. https://doi.org/10.3390/s17020270
AMA Style
Guan J, An F, Zhang X, Chen L, Mattausch HJ. Real-Time Straight-Line Detection for XGA-Size Videos by Hough Transform with Parallelized Voting Procedures. Sensors. 2017; 17(2):270. https://doi.org/10.3390/s17020270
Chicago/Turabian StyleGuan, Jungang, Fengwei An, Xiangyu Zhang, Lei Chen, and Hans J. Mattausch. 2017. "Real-Time Straight-Line Detection for XGA-Size Videos by Hough Transform with Parallelized Voting Procedures" Sensors 17, no. 2: 270. https://doi.org/10.3390/s17020270
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