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Optimizing hardware design for Human Action Recognition

  • Author(s): Ma, X
  • Borbon, JR
  • Najjar, W
  • Roy-Chowdhury, AK
  • Editor(s): Ienne, Paolo
  • Najjar, Walid A
  • Anderson, Jason
  • Brisk, Philip
  • Stechele, Walter
  • et al.

Human action recognition (HAR) is an important topic in computer vision having a wide range of applications: health care, assisted living, surveillance, security, gaming, etc. Despite significant amount of work having been conducted in this area in recent years, the execution speed still limits real-time applications. Moreover, it is highly desirable to have the compute-intensive feature extraction stage done right at the output of the camera to extract and transfer only action feature in multi-camera network setting and hence reduce network bandwidth requirement. In this work, we first evaluate the possibility to perform feature extraction under reduced precision fixed-point arithmetic to ease hardware resource requirements. We compared the Histogram of Oriented Gradient in 3D (HOG3D) feature extraction with state-of-the-art Convolutional Neural Networks (CNNs) methods and shown the later to be 75× slower than the former. Our experiment shows that by re-training the classifier with reduced data precision, the classification performs as well as the original double-precision floating-point. Based on this result, we implement an FPGA-based HAR feature extraction for near camera processing using fixed-point data representation and arithmetic. This implementation, using a single Xilinx Virtex 6 FPGA, achieves about 70× speedup over multicore CPU. Furthermore, a GPU implementation of HAR is introduced with 80× speedup over CPU (on an Nvidia Tesla K20). Last but not least, a power comparison is presented for the three platforms.

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