PHASE-BASED DISPARITY MEASUREMENT

被引:168
作者
FLEET, DJ
JEPSON, AD
JENKIN, MRM
机构
[1] UNIV TORONTO,DEPT COMP SCI,TORONTO M5S 1A4,ONTARIO,CANADA
[2] YORK UNIV,DEPT COMP SCI,N YORK M3J 1P3,ONTARIO,CANADA
来源
CVGIP-IMAGE UNDERSTANDING | 1991年 / 53卷 / 02期
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/1049-9660(91)90027-M
中图分类号
TP31 [计算机软件];
学科分类号
081202 ; 0835 ;
摘要
The measurement of image disparity is a fundamental precursor to binocular depth estimation. Recently, Jenkin and Jepson (in Computational Processes in Human Vision (V. Pylyshyn, Ed.), Ablex, New Jersey, 1988) and Sanger (Biol. Cybernet, 59, 1988, 405-418) described promising methods based on the output phase behavior of bandpass Gabor filters. Here we discuss further justification for such techniques based on the stability of bandpass phase behavior as a function of typical distortions that exist between left and right views. In addition, despite this general stability, we show that phase signals are occasionally very sensitive to spatial position and to variations in scale, in which cases incorrect measurements occur. We find that the primary cause for this instability is the existence of singularities in phase signals. With the aid of the local frequency of the filter output (provided by the phase derivative) and the local amplitude information, the regions of phase instability near the singularities are detected so that potentially incorrect measurements can be identified. In addition, we show how the local frequency can be used away from the singularity neighbourhoods to improve the accuracy of the disparity estimates. Some experimental results are reported. © 1991.
引用
收藏
页码:198 / 210
页数:13
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