Frédéric Cao, José-Luis Lisani, Jean-Michel Morel, Pablo Musé, Frédéric Sur (auth.)9783540684800, 3540684808, 3540684816, 9783540684817
Recent years have seen dramatic progress in shape recognition algorithms applied to ever-growing image databases. They have been applied to image stitching, stereo vision, image mosaics, solid object recognition and video or web image retrieval. More fundamentally, the ability of humans and animals to detect and recognize shapes is one of the enigmas of perception.
The book describes a complete method that starts from a query image and an image database and yields a list of the images in the database containing shapes present in the query image. A false alarm number is associated to each detection. Many experiments will show that familiar simple shapes or images can reliably be identified with false alarm numbers ranging from 10-5 to less than 10-300.
Technically speaking, there are two main issues. The first is extracting invariant shape descriptors from digital images. The second is deciding whether two shape descriptors are identifiable as the same shape or not. A perceptual principle, the Helmholtz principle, is the cornerstone of this decision.
These decisions rely on elementary stochastic geometry and compute a false alarm number. The lower this number, the more secure the identification. The description of the processes, the many experiments on digital images and the simple proofs of mathematical correctness are interlaced so as to make a reading accessible to various audiences, such as students, engineers, and researchers.
Table of contents :
Front Matter….Pages i-xi
Introduction….Pages 1-12
Extracting Meaningful Curves from Images….Pages 15-35
Robust Shape Directions….Pages 41-59
Invariant Level Line Encoding….Pages 61-77
A Contrario Decision: the LLD Method….Pages 81-92
Meaningful Matches: Experiments on LLD and MSER….Pages 93-125
Hierarchical Clustering and Validity Assessment….Pages 129-149
Grouping Spatially Coherent Meaningful Matches….Pages 151-165
Experimental Results….Pages 167-182
The SIFT Method….Pages 185-208
Securing SIFT with A Contrario Techniques….Pages 209-224
Back Matter….Pages 225-257
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