lifting wavelet tranform project

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  • 8/2/2019 lifting wavelet tranform project


    Image fusion algorithm using

    lifting wavelet transform

    Project work by:





    Guided by:D. N. Krishna Kumar

    Asst. Professor


  • 8/2/2019 lifting wavelet tranform project


    Introduction Image fusiona technique that integrates complementary information from

    multiple image sensor data such that the new image is more suitable for

    processing tasks.


    s -

    Pixel level fusion : Generates a fused image in which information associated with

    each pixel is determined from a set of pixels in source images.

    Feature level fusion : Requires the extraction of salient features which are

    depending on their environment such as pixel intensities, edges or textures. Thesesimilar features from input images are fused.

    Decision level fusion : Is a higher level of fusion. Input images are processed

    individually for information extraction. The obtained information is then combined

    applying decision rules to reinforce common interpretation.

  • 8/2/2019 lifting wavelet tranform project


    Introduction (cont)

    y Wavelets - mathematical functions that cut up data

    into different frequency components, and then study

    each component with a resolution matched to its

    scale. They have advantages over traditional Fourier

    methods in analyzing physical situations where

    the signal contains is continuities and sharp spikes.

    y DWT - discrete variant of the wavelet transform. The DWT of

    images is a transform based on the tree structure with D levels that

    can be implemented by using an appropriate bank of filters.

  • 8/2/2019 lifting wavelet tranform project


    Existing System

    y Fusion framework in feature-level.

    y Self-Organizing Neural Network.

    y Fuzzy Logic Neural Networks

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    Proposed Systemy An algorithm for image fusion using Lifting Wavelet filter is


    y In this algorithm, fusion is performed in transformed domain.

    y The performance of this algorithm is compared with that obtained

    using Laplacian Pyramid, Averaging fusion based approaches and

    guidelines on selection of an appropriate image fusion algorithm for

    different sensor conditions are evolved

  • 8/2/2019 lifting wavelet tranform project


    Lifting Wavelet Transform

    y Lifting Wavelet Transform is similar to DWT except that the number of

    samples at each stage is same as the initial set of samples. The input

    samples are split into odd and even sets of samples and passed through

    the filters (lifting steps) to give rise to approximation and details.


    The lifting scheme is a technique for both designing wavelets andperforming the DWT. Actually it is worthwhile to merge these steps and

    design the wavelet filters while performing the wavelet transform. This is

    then called the second generation wavelet transform.

  • 8/2/2019 lifting wavelet tranform project


    Block Diagram

  • 8/2/2019 lifting wavelet tranform project


    Functional Flow Diagrams

  • 8/2/2019 lifting wavelet tranform project


    Applicationsy Aerial and Satellite imaging

    y Robot vision

    y Concealed weapon detection

    y Multi-focus image fusion

    y Digital camera application

    y Battle field monitoring

  • 8/2/2019 lifting wavelet tranform project


    Applications (cont)

    yMedical imaging -

    Fusing X-ray computed topography (CT) and

    magnetic resonance (MR) images.

    Computer assisted surgery.

    Spatial registration of 3-D surface.

    yReal time applications -

    Deployed to make geographical data live GOOGLE MAPS or


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    y Because of the trade off between spatial resolution and spectral

    resolution in satellite imagery, it is often desirable to fuse lower

    resolution multispectral imagery with a high-resolution

    panchromatic image in order to obtain an image with the

    spectral resolution and quality of the former and the spatial

    resolution and quality of the latter.

    y Older algorithms tend to distort the color information.

    y The results from wavelet-based methods can be improved by

    applying more sophisticated schemes or more advanced models

    for injecting detail information.

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    Tools The basic algorithm is implemented using MATLAB r2009a running

    on a computer system.

    MATLAB (matrix laboratory) is a numerical computing environment

    and fourth-generation programming language.

    Developed by Mathworks, it has a large number of inbuilt toolboxes.

    We use the following ones

    Image Processing Toolbox

    Wavelet Toolbox

    Image Acquisition Toolbox

    Mapping Toolbox

  • 8/2/2019 lifting wavelet tranform project



    y The proposed algorithm chooses a different rule to fuse the image.

    y It is compared with Laplacian pyramid, the traditional low

    frequency and "average" algorithm.

    y It executes fast and saves memory.

    y Details and the edge of the fused image are reserved better.

    y The algorithm is very effective and is able to fuse multi-source


  • 8/2/2019 lifting wavelet tranform project


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