Image Association

Workflow Image Association in HGrid247-3.5

This workflow was created using HGrid247 and ran on an Apache Hadoop cluster .

Purpose
In contrast to Image Similarity , this workflow aims to:

Displays the relationship (association) between images
Shows matching keypoints between two images
Produces visualization of points of similarity

The output is not a number, but an image of the result of feature matching.

Konsep Image Association

If similarity only produces numbers:

    cover4 vs cover3 = 0.49

So the association produces:
visual connection lines between keypoints
Example:

Same corner point of book
Identical image patterns
Suitable texture

Methods used:

    SIFT (Scale Invariant Feature Transform)

Step 1 – Copy Workflow

Right click:
```
    WFImageSimilarity
```
Choose:
```
    Copy Workflow 
```
New name:
```
    WFImageAssociation
```

The goal: reuse the pipeline without creating it from scratch

Step 2 – Modify Workflow

Remove the following components:

    transformator_2
    GroupBy_1
    transformator_3
    Hfs_sink_1

Because:

No need for similarity value
No need to sort
Focus on visual association

Step 3 – Image Association Processing

Add Transformator (

) Connect:

    Transformator_1 → Transformator_4

Output Field

    img_association : Object

Main Functions

Use the function:

    KeyPointsAssociation

Relation:

    image1 ─┐
            ├── KeyPointsAssociation ──> img_association
    image2 ─┘

Parameter

Key Point Descriptor Method:
SIFT

This function will:

detect keypoints on both images
match keypoints
produce an image with connection lines

Step 4 – Saving Results to HDFS

Add Custom Sink (

)

Relation:

    Transformator_4 → Custom_output_format_1

Use Output Format:

    com.solusi247.image.ImageOutputFormat

Output is an image file (not text)

Step 5 – Compile Workflow

Click:

    Generate ()

Output:

    workshop_mr.jar

Step 6 – Running the Workflow

Command:

    hadoop jar workshop_mr.jar workshop.WFImageAssociation book output_association book/cover4.jpg

Parameter

    Parameter               Description
    -------------------------------------
    book                    image dataset
    output_association      results folder
    cover4.jpg              reference image

Output Results

The results are in the form of visual association images , for example:

Image association of cover4.jpg and cover1.jpg

Image association of cover4.jpg and cover2.jpg

Image association of cover4.jpg and cover3.jpg

Image association of cover4.jpg and cover4.jpg

Image association of cover4.jpg and cover5.jpg

Note : The file of workflow WFImageAssociation can be found in the following link : WFImageAssociation.csd