This paper presents a systematic approach for automatic generation of look-up-table (LUT) for function evaluations and minimization in hardware resource on field programmable gate arrays (FPGAs). The class of functions supported by this approach includes sine, cosine, exponentials, Gaussians, the central B-splines, and certain cylinder functions that are frequently used in applications for sign...

The depth quality of a time-of-flight (ToF) camera is influenced by many systematic and non-systematic errors . In this paper we present a simple method to correct and reduce these errors and propose a multi-phase approach to improve the depth acquisition accuracy. Compared with traditional calibration methods, we take the position of light source into account, and calibrate the light source to...

Hough transform is one of the most common methods for detecting shapes (lines, circles, etc.) in binary or edge images. Its advantage is the ability to detect discontinuous patterns in noisy images, but it requires a large amount of computing power. This paper presents a novel algorithm for computing the Incremental Hough Transform (IHT) that was developed for digital devices implementation. Th...

This paper introduces implementation of a wavelet neural network (WNN) with learning ability on field programmable gate array (FPGA). A learning algorithm using gradient descent method is not easy to implement in an electronic circuit and has local minimum. A more suitable method is the particle swarm optimization (PSO) that is a population-based optimization algorithm. The PSO is similar to th...

This study compared the use of both the MODIS LAI (MOD15A2) product, which provides directly the 8-day LAI at 1km spatial resolution, and the MODIS 8-day surface reflectance product (MOD09A1) in retrieving and estimating the seasonal variation of LAI for irrigated rice in the Mekong delta, Vietnam. The Soil-Leaf-Canopy (SLC) radiative transfer model was employed to invert MOD09A1 reflectance sp...

Direct digital synthesis (DDS) is a method to generate waveforms directly in the digital domain. In this method,the target waveforms are the sine and cosine ones. The Co-ordinate Rotational Digital Computer (CORDIC) algorithm configured in Rotation Mode (RM) can behave as a quadrature phase-to-amplitude converter that directly generates sine and cosine waveforms. The main advantage of using COR...

In this paper, performance and area of conventional FIR (Finite Impulse Responce) filters versus ternary sigma delta modulated FIR filter is compared in FPGA (Field Programmable Gate Arrays) using VHDL (Verilog Description Language). Two different approaches were designed and synthesized at same spectral performance by obtaining a TIR (Target Impulse Response). Both filters were synthesized on ...

In this paper, we present a novel Field Programmable Gate Array (FPGA) implementation of advanced encryption standard (AES128) algorithm based on the design of high performance S-Box built using reduced residue of prime numbers. The objective is to present an efficient hardware realization of AES-128 using very high speed integrated circuit hardware description language (VHDL). The novel S-Box ...

The problem of encoding arises in several areas of logic synthesis. Due to the nature of this problem, it is often difficult to systematically explore the space of all feasible encodings in order to find an optimal one. In this paper, we show that when the objects to be encoded are Boolean functions, it is possible to formulate and solve the problem optimally. We present a general approach to t...

The demand on fast H.264 video processing technology is highly increasing since the electronics devices with encoding, transmission, and decoding high-resolution video are becoming popular in the consumer market. In this paper, we present a fast H.264 video decoding method by modifying the algorithm dealing with parsing bit-stream of variablelength code (VLC). The key idea of our approach is to...