Embedded System for Image Encoder/Decoder Based on Fast Wavelet MALLATs Algorithm: Application to Nuclear Imaging
Slami Saadi, Maamar Touiza, Abderrezak Guessoum · 2007
In this work, we present a mixed software/hardware Implementation of 2D signals Encoder/Decoder using dyadic Discrete Wavelet Transform based on quadrature mirror filters (QMF), by applying fast wavelet Mallats algorithm. The proposed work is implemented and compiled on the embedded development kit EDK6.3i and the synthesis software ISE6.3i available with Xilinx Virtex-II FPGA using C language. The calculated wavelet coefficients will be encoded using Huffman coding scheme in order to be transmitted progressively through an Ethernet TCP/IP based connection. The proposed design can significantly accelerate the DWT and the possible reconfiguration can be exploited to reach a higher performance in the future. The basic motivation of our application to radio isotopic images and neutron tomography projections is to reduce the data volume and to achieve a low bit rate in the digital representation images without perceived loss of image quality. The system is designed to be integrated as an extension to the nuclear imaging system implemented around our nuclear research reactor and have been appreciated by neutron radiography physists. This implementation can be used to accelerate other image processing applications. Keywords-Encoder/Decoder, DWT, Embedded, FPGA, nuclear imaging, research reactor.