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GPU Computing Gems Emerald Edition by Wen-mei W. Hwu

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Chapter 32. Real-Time Speed-Limit-Sign Recognition on an Embedded System Using a GPU
Pinar Muyan-Özçelik, Vladimir Glavtchev, Jeffrey M. Ota and John D. Owens
We address the challenging problem of detecting and classifying speed-limit signs in a real-time video stream using an embedded, low-end GPU. We implement three pipelines to address this problem. The first is a detection-only feature-based method that finds objects with radial symmetry (suitable for circular EU-speed-limit signs). In this implementation, we leverage the graphics part of the GPU pipeline to perform the radial-symmetry voting step. The second is a template-based method that searches for image templates in the frequency domain using Fast Fourier Transform (FFT) correlations, ...

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