Multimedia Technologies and Applications

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Multimedia Technologies and Applications

• Assignment Image Retrieval

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Objectives

• Develop an image database system (IDS)
• Feature extraction and indexing mechanism
• Image storage manager
• Image retrieval mechanism
• Web-based user interface

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Project Information

• Course Link
• http//www.cs.cityu.edu.hk/rynson/mminfo/index.ht
  ml
• Assignment Link
• http//www.cs.cityu.edu.hk/rynson/mminfo/mmassign
  ment.html
• My Link
• http//www.cs.cityu.edu.hk/kwfli

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Software Tools

• IBM's Query By Image Content (Qbic)
• CVIPtools

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Part 1

• IBM's Query By Image Content (Qbic)

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Image Types Supported (Examples)

• OS/2 and Windows bitmap image, BA-type only (bmp)
  
• GIF 87 or 89a (gif)
• JPEG (jpg/jpeg)
• PBMPLUS portable graymap (pgm)
• PBMPLUS portable pixmap (ppm)
• TIFF 5.0 image, including CCITT Group 3 and Group
  4 fax image (tiff/tif)
• Targa (tga)

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Qbic Structure

• Environment variables
• QbicDatabaseName
• QbicCatalogName
• QbicImagePath
• QbicTextPath
• QbicThumbPath

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Qbic Commands

• Populating a QBIC database (QbMkDbs)
• Querying a QBIC database (QbQBE)
• Generating thumbnail images (QbMkThmb)
• Others
• Remarks You can run these programs in a command
  shell, or call them from your application using
  system or execl calls

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Populating a QBIC database

• Example
• C\imagesgtQbMkDbs -c ibm -d c\qbic\QbicData
• f QbColorHistogramFeatureClass DSC0001.jpg
• QbicCatalogName
• QbicDatabaseName
• Features described
• Pictures Filename

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Querying a QBIC database

• Example Retrieve most similar pictures from IDS
  based on the selected feature and the input
  picture
• C\gtQbQBE -f QbColorHistogramFeatureClass -i
  flower02.jpg -n 5
• Features described
• Input picture for comparing
• Number of pictures return (most similar)

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Features described

• QbColorFeatureClass
• average color of an image
• QbColorHistogramFeatureClass
• color histogram, or the percentages of the
  different colors
• QbDrawFeatureClass
• colors in an image, together with where they
  occur, also referred to as the color layout of an
  image
• QbTextureFeatureClass
• the average texture of an image.
• QbTextFeatureClass
• keywords

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Generating thumbnail images

• Example create a small picture to display on
  webpage faster
• C\gt QbMkThmb DSC0001.JPG DSC0001.ibm.gif
• Input Filename
• Output Filename

Catalog name included ?Easy to manage
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Demos