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The Research on Application of Wavelet Based Digital Image Technology

Author: TianLei
Tutor: ZhangMiaoMiao；XuYanLing；HuangXiaoDong
School: Tongji University
Course: Software Engineering
Keywords: Wavelet Transform Image Compression JPEG 2000
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 248
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Abstract


The wavelet transform is used to signal and image compression is an important aspect of the wavelet transform is applied . It is characterized by a high compression ratio , compression speed , the compressed signal with the characteristics of the image can be maintained unchanged , and can antijamming in transmission . In 2000, developed at the Joint Photographic Experts Group JPEG 2000 standard , using a discrete wavelet transform to replace the discrete cosine transform of the original JPEG standard , so that the image quality at the same compression ratio has greatly improved , and can be Select lossy and lossless compression and error recovery functions . The paper used in the JPEG 2000 standard 5 /3 wavelet transform and 9 /7 wavelet transform , first start from the basic principles of the wavelet transform signal commence from the sequence to the derivation of the discrete wavelet transform , two-dimensional wavelet transform . And 5 /3 wavelet transform in JPEG 2000 and 9 / 7 wavelet transform structure is introduced . The wavelet transform as an important part in the JPEG 2000 standard , and its parameters will directly affect the quality of image quality . The paper combines a large number of experimental data , research and analysis of wavelet transform layers , the choice of the wavelet basis image quality . Papers on 5 /3 wavelet transform in the JPEG 2000 standard , and 9 / 7 wavelet transform to achieve in-depth study to explore the signal cyclical expansion of pretreatment part 5 / 3 wavelet transform and 9 / 7 wavelet details transform to enhance the structure of the implementation process , and provide a framework and pseudo- code . Proved wavelet transform intermediate results of the extremal problem encountered in practical engineering . In the accuracy of the small number of issues of the wavelet transform process is also an important factor in the video image quality , given the specific implementations of fixed-point decimal arithmetic , certain guiding significance for practical engineering application .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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