The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	A comparative study of image compress schemes
Author:	Wang, Kui
View Online:	njit-etd1996-104 (xii, 67 pages ~ 4.0 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Master of Science
Program:	Electrical Engineering
Document Type:	Thesis
Advisory Committee:	Akansu, Ali N. (Committee chair) Ansari, Nirwan (Committee member) Siveski, Zoran (Committee member)
Date:	1996-01
Keywords:	Image compression.
Availability:	Unrestricted
Abstract:	Image compression is an important and active area of signal processing. All popular image compression techniques consist of three stages: Image transformation, quantization (lossy compression only), and lossless coding (of quantized transform coefficients). This thesis deals with a comparative study of several lossy image compression techniques. First, it reviews the well-known techniques of each stage. Starting with the first stage, the techniques of orthogonal block transformation and subband transform are described in detail. Then the quantization stage is described, followed by a brief review of the techniques for the third stage, lossless coding. Then these different image compression techniques are simulated and their rate-distortion performance are compared with each other. The results show that two-band multiplierless PR-QMF bank based subband image codec outperforms other filter banks considered in this thesis. It is also shown that uniform quantizers with a "dead-zone" perform best. Also, the multiplierless PR-QMF bank outperforms the DCT based on uniform quantization, but underperforms the DCT based on uniform quantization with a "dead-zone".