Department Publications

Light fields (LFs) and light field videos (LFVs) capture both angular and spatial variation of light rays emanating from scenes. This richness of information leads to novel applications such as post-capture refocusing, depth estimation and depth-velocity filtering which are not possible with images and videos. These capabilities come, however, with a significant increase in data to be processed. In order to fully exploit opportunities provided by LFs and LFVs, low-complexity signal processing algorithms that process LF and LFV data in real-time are required. In this brief, we survey such state-of-the-art algorithms, in particular for depth filtering, refocusing and denoising of LFs and depth-velcoty filtering for LFVs, and future directions for these real-time LF an LFV processing algorithms.

With the advancement of technology, the digital Integrated Circuit (IC) design process has become more complex and denser. Hence, the IC testing procedure requires high-end test equipment to validate the accuracy and reliability of the manufactured components. Testers with such capabilities usually cost millions of dollars. In this paper, the authors have presented a low-cost hardware and software solution for digital IC testing. Digital ICs which operate under the 100MHz range can be easily tested in the digital domain with the FPGA-based test environment. The presented design comprises of a scalable architecture with a set of clock synchronized Altera DE0-Nano Field Programmable Gate Arrays (FPGAs) which handles the digital testing of Device Under Test (DUT) at a low cost. The digital test patterns are generated inside a computer, which transfers them to the FPGA environment and feeds them to DUT. The …

In four-dimensional (4-D) light field (LF) processing, 4-D linear shift-invariant filters having hyperplanar passbands are used for depth-based scene enhancement. In this paper, two low-sensitivity and low-complexity field programmable gate array (FPGA)-based digital hardware architectures for 4-D hyperplanar filters are proposed for on-chip real-time processing of LFs. Both 4-D filters are designed exploiting resonant properties of multi-dimensional passive prototype networks, and are realized as wave digital filters (WDFs). The two 4-D WDF realizations are implemented as raster-scanned processing architectures on a Xilinx Virtex 6 Sx35 FPGA with a real-time clock speed of up to 33 MHz. This corresponds to a real-time throughout of 16.8 LFs/s for an LF of size .