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Image Field Categorization and Edge/Corner Detection from Gradient Covariance
February 2000 (vol. 22 no. 2)
pp. 179-190
ASCII Text
x 
 
Shigeru Ando, "Image Field Categorization and Edge/Corner Detection from Gradient Covariance," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 22, no. 2, pp. 179-190, February, 2000.
 
 
BibTex
x
 
@article{ 10.1109/34.825756,
author = {Shigeru Ando},
title = {Image Field Categorization and Edge/Corner Detection from Gradient Covariance},
journal ={IEEE Transactions on Pattern Analysis and Machine Intelligence},
volume = {22},
number = {2},
issn = {0162-8828},
year = {2000},
pages = {179-190},
doi = {http://doi.ieeecomputersociety.org/10.1109/34.825756},
publisher = {IEEE Computer Society},
address = {Los Alamitos, CA, USA},
}
 
 
RefWorks Procite/RefMan/Endnote
x 
 
TY - JOUR
JO - IEEE Transactions on Pattern Analysis and Machine Intelligence
TI - Image Field Categorization and Edge/Corner Detection from Gradient Covariance
IS - 2
SN - 0162-8828
SP179
EP190
EPD - 179-190
A1 - Shigeru Ando,
PY - 2000
KW - Image feature extraction
KW - edge
KW - corner
KW - vertex
KW - gradient covariance.
VL - 22
JA - IEEE Transactions on Pattern Analysis and Machine Intelligence
ER -
 

Abstract—Edges, corners, and vertices in an image correspond to 1D (one-dimensional) and 2D discontinuities in the intensity surface of the underlying scene. Ridges and peaks correspond to 1D and 2D extrema in it. All of them can be characterized by the distribution of gradients, particularly by dimensionality of it. The approach to image field categorization here is to construct a covariance matrix of the gradient vector in each small window and apply the canonical correlation analysis to it. Schwarz's inequality on the matrix determinant and the related differential equation is the key to this analysis. We obtain two operators $P_{EG}$ and $Q_{EG}$ to categorize the image field into a unidirectionally varying region (UNIVAR), an omnidirectionally varying region (OMNIVAR), and a nonvarying region. We investigate the conditions under which their absolute maximum response, i.e., $P_{EG}=1$ and $Q_{EG}=1$, occurs in the small window and show that they are, respectively, the desired 1D and 2D discontinuities/extrema and OMNIVAR, is in many cases, a 1D pattern in polar coordinates. This leads to an algorithm to obtain further classification and accurate localization of them into edges, ridges, peaks, corners, and vertices through detailed analysis in the informative (varying) axis of them. We examined and compared the performance of the operators and the localization algorithm on various types of images and various noise levels. The results indicate that the proposed method is superior with respect to stability, localization, and resolution.

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Index Terms:
Image feature extraction, edge, corner, vertex, gradient covariance.
Citation:
Shigeru Ando, "Image Field Categorization and Edge/Corner Detection from Gradient Covariance," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 22, no. 2, pp. 179-190, Feb. 2000, doi:10.1109/34.825756
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