Content-based Image Retrieval

Content-based Image Retrieval - Content-based Image...

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Content-based Image Content-based Image Retrieval Retrieval Presentation by Presentation by Charlie Neo Charlie Neo
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Introduction Introduction Why Digital image database growing rapidly in size Professional needs – Logo Search Difficulty in locating images on the web Example Find a picture of me and jack on the bus
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Application CBIR Application CBIR Search for one specific image. General browsing to make an interactive choice. Search for a picture to go with a broad story or search to illustrate a document. Search base on the esthetic value of the picture.
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Two Classes of CBIR Two Classes of CBIR Narrow vs. Broad Domain Narrow vs. Broad Domain Narrow Medical Imagery Retrieval Finger Print Retrieval Satellite Imagery Retrieval Broad Photo Collections Internet
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Challenges Challenges Semantic gap The semantic gap is the lack of coincidence between the information that one can extract from the visual data and the interpretation that the same data have for a user in a given situation. User seeks semantic similarity, but the database can only provide similarity by data processing. Huge amount of objects to search among. Incomplete query specification. Incomplete image description.
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Description Of Content: Description Of Content: Image Processing Image Processing Color Color Local Shape Local Shape Texture Texture
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Color Image Processing Color Image Processing Problems with color variances Problems with color variances Surface Orientation Surface Orientation Camera Viewpoint Camera Viewpoint Position of Illumination Position of Illumination Intensity of the Light Intensity of the Light
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Color Image Processing Color Image Processing Approaches Approaches Opponent color axes Advantage of isolating the brightness information on the third axis. Invariant to changes in illumination intensity and shadows.
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This note was uploaded on 05/22/2011 for the course COMP 207 taught by Professor Zhangli during the Spring '11 term at University of Liverpool.

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Content-based Image Retrieval - Content-based Image...

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