21 / 06 / 2000segmentation of sea-bed images.1 josepha unia ecole centrale de lyon
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21 / 06 / 2000 Segmentation of Sea-bed Images. 1
Segmentation of Sea-bed Images. Segmentation of Sea-bed Images.
JosephaUNIA
Ecole Centrale de Lyon
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21 / 06 / 2000 Segmentation of Sea-bed Images. 2
SummarySummary
• Introduction
• Sensing
• Image segmentation
• Vector quantization
• Preliminary results
• Perspectives
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IntroductionIntroduction
• Provide the information necessary for a safe and sustainable exploitation of underwater resources.
• Develop and implement mathematical models, and sensingsensing and guidance techniques
• Marine application : Mapping of living/dead Maerl.
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21 / 06 / 2000 Segmentation of Sea-bed Images. 4
Sensing (WP3, subtask 3.1)Sensing (WP3, subtask 3.1)Design signal processing algorithms for :
– on-line extraction of features for platform guidanceSegmentation of video imagesSegmentation of video images
– video mosaicing
– using contour information to correct (effects of) positioning errors
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21 / 06 / 2000 Segmentation of Sea-bed Images. 5
Image segmentationImage segmentation
ROV Control
Image
SegmentationSegmentation Contour-extraction
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DictionaryDictionary• What size for window (vector) ?
Vector quantizationVector quantization
•What size for dictionary ?
•What words ?
•What resemblance measure ?
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Algorithm OutlineAlgorithm Outline
Dictionary learning
• Initialize dictionaryInitialize dictionary (centroid of all vectors - windows)
• Split until desired dictionary size is reachedSplit until desired dictionary size is reached
• PARTITIONING : make best attribution of each vector to current dictionary • CORRECT DICTIONARY to get minimal distortion (for current partioning)
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Preliminary results (1)Preliminary results (1)Dic
Window2 4 16 32
30 x 30
3 x 3
10 x 10
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Preliminary results (2)Preliminary results (2)
Frame 01 Frame 02 Frame 03 Frame 04
F_out 02F_out 01 F_out 03 F_out 04
2 CODEWORDS - WINDOW 10x102 CODEWORDS - WINDOW 10x10
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Preliminary results (3)Preliminary results (3)
Frame 01 Frame 02 Frame 03 Frame 04
F_out 02F_out 01 F_out 03 F_out 04
16 CODEWORDS - WINDOW 10x1016 CODEWORDS - WINDOW 10x10
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Lower resolution imageLower resolution image
Window 10x10 & 2 clusters
What resolution ?What resolution ?
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• Learning• representation of classes (coverage with enough vectors)• rotation invariance
PerspectivesPerspectives
•Choice of distance• Euclidean distance good for compression• Distance more sensitive to texture variation
•Automatic tuning of the algorithm’s parameters • distance size of windows size of dictionary.
• Adaptive adjustment (tracking of classes’ characteristics)