Podcast
Questions and Answers
What is the primary advantage of text-based search in multimedia databases?
What is the primary advantage of text-based search in multimedia databases?
When the database is fully indexed with proper keywords.
Which of the following features are often used in image retrieval?
Which of the following features are often used in image retrieval?
What does C-BIRD stand for?
What does C-BIRD stand for?
Content-Based Image Retrieval from Digital libraries.
What is the purpose of a color histogram in image search?
What is the purpose of a color histogram in image search?
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A color histogram counts pixels with specific pixel values in _____ (list three colors).
A color histogram counts pixels with specific pixel values in _____ (list three colors).
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Histogram intersection is used to compare sound features in multimedia retrieval.
Histogram intersection is used to compare sound features in multimedia retrieval.
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What step is done in C-BIRD for each target image during preprocessing?
What step is done in C-BIRD for each target image during preprocessing?
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What happens during the histogram intersection process?
What happens during the histogram intersection process?
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Study Notes
Content Based Retrieval in Digital Libraries
- Content-based retrieval utilizes multimedia content itself to retrieve information, as opposed to text-based search which relies on keywords.
- Common image retrieval features used include color histogram, color layout, texture, and their variations.
C-BIRD
- C-BIRD (Content-Based Image Retrieval from Digital Libraries) is an image database search engine.
- Its online database can be searched through various tools, including text annotations, color histogram, color layout, texture layout, illumination invariance, and object model.
- The GUI allows users to browse the image database and search for specific images.
Color Histogram
- It counts pixels with specific Red, Green, and Blue (RGB) values in an image.
- It is represented as a 3-dimensional array with 256³ bins for images with 8-bit values in each of R, G, B.
- In C-BIRD, a color histogram is calculated for each image during preprocessing and referenced in the database against user query images.
Histogram Intersection
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Histogram intersection is used to measure the similarity between color histograms.
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Images in the database have normalized histograms with a sum of unity.
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These histograms are intersected with the query image histogram using the formula:
intersection = Σ(min(Hji , Hjm))where
jrepresents the histogram bin,nrepresents the total number of bins for each histogram,Hjiis the histogram bin value for the target image, andHjmis the histogram bin value for the model (query) image. -
The resulting intersection value represents the degree of similarity between the query image and each target image in the database.
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Description
Explore the fundamentals of content-based retrieval, focusing on multimedia content for information search. Learn how C-BIRD, an image database search engine, employs features like color histograms and textures for effective image retrieval.
