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Information Retrieval Class Presentation. Content Based Color Image Retrieval vi Wavelet Transformations. May 2, 2012 Author: Mrs. Y.M. Latha Presenter: Mahbubur Rahman Advisor: Prof. Susan Gauch. Table of Contents. Introduction Target Environment Proposed CBIR Wavelet Transform

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Information retrieval class presentation

Information Retrieval Class Presentation

Content Based Color Image Retrieval vi Wavelet Transformations

May 2, 2012

Author: Mrs. Y.M. Latha

Presenter: Mahbubur Rahman

Advisor: Prof. Susan Gauch


Table of contents
Table of Contents

  • Introduction

  • Target Environment

  • Proposed CBIR

  • Wavelet Transform

  • Feature Extraction

  • Similarity Criteria

  • Progressive Retrieval Strategy

  • Experiment Result

  • Conclusion


Introduction
Introduction

  • Content Based Image Retrieval

    • Database is huge

    • Retrieved the desired image from the database


Introduction1
Introduction

  • Content Based Image Retrieval

    • Images have specific features-horizontal or vertical lines

    • Image features are compared to find similar images

Query image

Feature extract to compare

Database Image


Target environment
Target Environment

  • Color Image Retrieval

    • Based on Object Visual contents of image

      • Color, Texture and Shape

    • Multimedia image with audio, text and video are not covered


Proposed cbir
Proposed CBIR

  • Wavelet Based CBIR

    • Indexing -wavelet decomposition then F-norm

    • Searching-wavelet decomposition, F-norm then similarity matching

Searching

Process

Indexing

Process


Wavelet transform
Wavelet Transform

  • Wavelet Transformation

    • Decompose using rescaling and keeping details of image


Wavelet transform1
Wavelet Transform

  • Haar Wavelet Transform

    • Find out N/2 wavelet values and N/2 coefficients from N data

    • Upper half is wavelet functions and lower half is coefficient values

N/2

N

N/2


Wavelet transform2
Wavelet Transform

  • Haar Wavelet Transform

    • Average and differentiate values to get wavelets function and coefficients

First half is the average

of each pair

second half is the

Difference of each pair


Wavelet transform3
Wavelet Transform

  • Haar Wavelet Transform

    • Average and differentiate values to get wavelets function and coefficients

First half is the average

of each pair

second half is the

Difference of each pair


Wavelet transform4
Wavelet Transform

  • Haar Wavelet Transform

    • First level decomposition

HL

HH

LL

LH


Wavelet transform5
Wavelet Transform

  • Haar Wavelet Transform

    • Haar matrix can do these steps in one operation


Wavelet transform6
Wavelet Transform

  • D4 Wavelet Transform

    • Use scaling function

    • Upper half scaling coefficients and lower half wavelets coefficients


Wavelet transform7
Wavelet Transform

  • D4 Wavelet Transform

    • D4 use four scaling function to transform image

Scaling functions

Wavelet functions


Features extraction
Features Extraction

  • Feature Vector

    • F-norm extract the image features from scaled image matrix


Features extraction1
Features Extraction

  • Feature Vector

    • F-norm extract the image features from scaled image matrix

||A0||F

||A1||F

||A3||F

||A5||F

||A7||F

||A0||F=0;

||A1||F =(5762+7042+7042+6402)1/2

∆A1= ||A1||F - ||A0||F =1316.29

||A2||F

||A4||F

||A6||F

Feature vector :

VAF={∆A1, ∆A2, ∆A3, ∆A4……. ∆An)


Similarity criteria
Similarity Criteria

  • Image matching criteria

    • Feature vector is calculate both for query image and indexed image

    • Extracts similarity criteria from feature vector

Similarity αiof ∆Ai and∆Bi

Image A

Similarity αiof full two images

Image B


Progressive retrieval
Progressive Retrieval

  • Rough Filtering from LL coefficient

    • Calculate Standard variances vectors

      • Query image as(σrq , σgq , σbq ) & database image as(σrd , σgd , σbd )

    • Roughly filter out database image using

      • F=(βσrq < σrq < σrq / β) && (βσgq < σgq < σgq / β) && (βσbq < σbq < σbq / β) where βε (0,1)

      • If F is false then image is not any kind of similar

  • Progressive Rough Filtering

    • Filter considering the high frequency component with LH and HL coefficients

  • More precise filtering

    • LL coefficient best reflect the image feature

    • Apply similarity criteria to LL coefficient

    • If α exceeds certain threshold, discard as mismatch

  • Iteration

    • Iterate filtering process for all decomposition level to return precise image


Experimental result
Experimental Result

  • Experiment Setup

    • D4 and Haar wavelet transform to decompose images

    • Maximal decomposition level =4

    • F-norm apply to extract image feature both for indexing and query image

    • Total 4 groups of images indexed, each containing 600 images

    • All images are preprocessed to be 256X256 sizes


Experimental result1
Experimental Result

  • Query result using Haar Wavelet

    • Relevant images retrieved using the similarity constants


Experimental result2
Experimental Result

  • Query result using D4 Wavelet

    • Relevant images retrieved using the similarity constants


Experimental result3
Experimental Result

  • Recall Rate Comparison

    • D4 wavelet recall rete is higher than the haar and existing wavelet histogram


Experimental result4
Experimental Result

  • Retrieval Speed Comparison

    • Both D4 and Haar are slower than existing histogram wavelet


Conclusion
Conclusion

  • Proposed CBIR applied

    • Wavelet decomposition of images

    • F-norm to extract images features

    • Progressive retrieval to get the precise result

  • Proposed CBIR

    • Retrieve more accurate result than existing wavelet technique

    • D4 wavelet ensure greater speed with increase recall rate

    • Achieved high retrieval performance in real time CBIR systems