Weighted Reference Shifted Phase Encoded Fjtc Technique for Class Associative Target Detection

3rd International Conference on Electrical & Computer Engineering

ICECE 2004, 28-30 December 2004, Dhaka, Bangladesh

ISBN 984-32-1804-4 426

WEIGHTED REFERENCE SHIFTED PHASE ENCODED FJTC

TECHNIQUE FOR CLASS ASSOCIATIVE TARGET DETECTION

M. Fahad*, M. Hasan*, T. Husna*, Md. Rafiqul Haider* and Mohammed Nazrul Islam*

*Department of Electrical and Electronic Engineering, Bangladesh University of Engineering and

Technology, Dhaka-1000, Bangladesh, E-mail: nazrul@eee.buet.ac.bd

ABSTRACT

A new weighted reference based class associative

joint transform correlation technique has been

proposed for multiple target detection process.

Different channels are used for each member of the

class to get the correlation output and then the

different channel outputs are summed up to get the

final correlation output. The phase encoding and

phase-shifting principle is used to eliminate the false

alarms and other extraneous signals. Finally, a new

post processing technique is employed to enhance

the discrimination ratio between target and nontarget

objects. Simulation results are presented to

verify the efficiency of the proposed method.

1. INFORMATION

Optical pattern recognition may be broadly

classified into two categories; namely, VanderLugt

type filter-based correlation [1] and joint transform

correlation (JTC) [2]. A VanderLugt type correlator

requires a priori fabrication of the filter used in the

correlation process, whereas the JTC technique can

be operated at the video frame rates [3]. However, a

classical JTC suffers from poor discrimination,

strong zero-order peak and wide correlation width.

Among the various modifications of JTC technique,

the shifted phase-encoded fringe adjusted JTC

(SPFJTC) is found to be the superior one