Chao* JI, Xiao-dong YANG, Wei WANG. Invariance of image ellipse oblateness degree and its application to construction of affine invariants[J]. Optics and precision engineering, 2016, 24(8): 2078-2086.
DOI:
Chao* JI, Xiao-dong YANG, Wei WANG. Invariance of image ellipse oblateness degree and its application to construction of affine invariants[J]. Optics and precision engineering, 2016, 24(8): 2078-2086. DOI: 10.3788/OPE.20162408.2078.
Invariance of image ellipse oblateness degree and its application to construction of affine invariants
As the traditional affine invariants based on the invariant of area ratio are characterized by unstable and redundant feature points
error accumulation
this paper proposes a novel method based on the division strategy of image ellipse oblateness degree for construction of affine invariants. The affine transformation model was presented
and the condition of affine approximation was obtained. In combination of the definition of image ellipse oblateness degree and the invariant moment theory
the invariance of image ellipse oblateness under affine transformation was verified. Meanwhile
the definition of image oblateness degree and its physical meaning were given. Then
on the basis of the image ellipse oblateness degree
the affine invariant moments below the 3rd order were selected as the feature descriptors
the image target was described by calculation of the affine invariants of each concentric region. Finally
the proposed method was applied to the actual ship images and its stability was analyzed by discrete coefficients. Experimental results indicate that all kinds of the target images for the same ship under different affine transformations have the same oblateness degree
and the maximum discrete coefficient in the divided feature region is 1.55%.It concludes that the proposed method is unique for the image division and constructed affine invariants have good stability.
关键词
Keywords
references
FLUSSER J, SUK T. Pattern recognition by affine moment invariants[J]. Pattern Recognition, 1993, 26(1): 167-174.
YANG Z W, COHEN F S. Image registration and object recognition using affine invariants and convex hulls [J]. IEEE Trans. on Image Processing, 1999, 8(7): 934-946.
ZHANG J Q, TAN T N. Affine invariant texture analysis based on structural properties[C]. Proc. of the Fifth Asian Conference on Computer Vision, Melbourne, Australia, 2002: 216-221.
FLUSSER J. Moment invariants in image analysis[C]. Proc. of World Academy of Science Engineering and Technology, 2006, 11: 196-201.
HU M K. Visual pattern recognition by moment invariants[J].Trans. on Information Theory, 1962, 8: 179-187.
HORNG M. Multilevel thresholding selection based on the artificial bee colony algorithm for image segmentation[J].Expert Systems with Applications, 2011, 38(11): 13785-13791.
AVID D, LOWE G. Distinctive image features from scale-invariant keypoints[J].International Journal of Computer Vision, 2004, 60(2): 99-114.
RAHTU E, SALO M, HEIKILA J. Affine invariant pattern recognition using multiscale autoconvolution[J].IEEE Trans.on Pattern Analysis and Machine Intelligence, 2005, 27(6): 908-918.
WANG X N, QIU L K, CHENG Y, et al. An area ratio between rings based translation, rotation and scale invariant descriptor[J]. Pattern Recognition and Artificial Intelligence, 2012, 25(1): 82-88. (in Chinese)
LIU Y SH.Affine invariants based on covariance matrix[J]. Journal of Chinese Computer Systems, 2007, 28(7): 1282-1286. (in Chinese)
LIU Y SH. A set of invariants based on mass/area[J]. Journal of South China Normal University(Natural Science Edition) , 2007(2): 57-61. (in Chinese)
CHEN T, SU Y, JIANG Y M, et al. Affine invariant feature extraction based on affine geometry[J]. Journal of Image and Graphics, 2007, 12(9): 1633-1641.
WANG L, WEI W, WU L G, et al. Novel target recognition method for SAR images[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(3): 429-434.(in Chinese)
LI X T, CAO L H, WANG S W. Aircraft recognition based on affine transform[J]. Opt. Precision Eng., 2009, 17(2): 402-408.(in Chinese)
MENG Y ZH, MA Y, BAI B, et al. Improved lung segmentation algorithm based on 2D Otsu optimized by PSO[J].Chinese Journal of Liquid Crystals and Displays, 2015, 30(6): 1000-1007.(in Chinese)
JIA P, XU N, ZHANG Y. Automatic target recognition based on local feature extraction[J]. Opt. Precision Eng., 2013, 21(7): 1898-1905.(in Chinese)