Title :
Digital reconstruction of Fourier optical signal using efficient 24-bit floating point multiply-add-subtract module
Author :
Wahab, Abdul ; Heok, Tan Beng ; Erdogan, S.S.
Author_Institution :
Sch. of Appl. Sci., Nanyang Technol. Univ., Singapore
Abstract :
This paper describes a practical Fourier optical signal processor (FOSP) as a pre-processor for digital signal processing (DSP). The input illumination is a coherent light source from a HeNe laser and computation of the Fourier Transform (FT) is carried out via an FT lens. An image is placed in the front focal plane of the FT lens and at the back focal plane of the lens, the Fourier transform image results. Using the method reported by Xu (1988) for the measurement of the phase information the real and imaginary information is retrieved and fed electronically into a Fast Fourier Transform (FFT) module, using 24-bit floating point units capable of performing efficient multiplication, addition and subtraction to reconstruct the original image. Many of such floating-point units are used in parallel in a pipelined architecture to perform FFT or other complex function for digital signal processing (DSP) computations
Keywords :
fast Fourier transforms; floating point arithmetic; image reconstruction; optical information processing; FT lens; Fast Fourier Transform; Fourier Transform; Fourier optical signal processor; Fourier optical signal reconstruction; Fourier transform image; HeNe laser; digital signal processing; digital signal processing computations; floating point multiply-add-subtract module; input illumination; pipelined architecture; Digital signal processing; Fourier transforms; Image reconstruction; Information retrieval; Lenses; Light sources; Lighting; Optical signal processing; Phase measurement; Signal processing;
Conference_Titel :
TENCON '94. IEEE Region 10's Ninth Annual International Conference. Theme: Frontiers of Computer Technology. Proceedings of 1994
Print_ISBN :
0-7803-1862-5
DOI :
10.1109/TENCON.1994.369157