The computation of orientation statistics from visual texture

被引:196
作者
Dakin, SC [1 ]
Watt, RJ [1 ]
机构
[1] UNIV STIRLING,DEPT PSYCHOL,STIRLING FK9 4LA,SCOTLAND
关键词
texture; orientation; scale; centroid; resolution;
D O I
10.1016/S0042-6989(97)00133-8
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
This paper examines how observers estimate the overall orientation of spatially disorganised textures containing variable orientation. Experiments used asymmetrical distributions of orientations to separate the predictions from different models of average orientation estimation. Stimuli were composed of two spatially intermingled sets of oriented patches, each set having Gaussian distributed element orientation. The threshold separation of the means of the two sets was determined for a variety of tasks. Discrimination of these textures from a reference composed of two sets with the same mean orientation was well predicted by discrimination of orientation variability. A single interval judgement of which set contained more elements required a greater separation of the set orientations and suggested that the sets must be resolved in the orientation domain for independent representation of their properties. That resolution is required to perform this task further suggests that orientational skew is not coded. Threshold offsets for judgement of average orientation were re-expressed as shifts of four candidate features for coding the central tendency of texel orientations, Comparison with similar thresholds for single distributions of orientations indicated that average orientation is assigned to the centroid of a set of orientation measures. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:3181 / 3192
页数:12
相关论文
共 32 条
[1]   SPATIAL LOCATION AND HYPERACUITY - THE CENTER-SURROUND LOCALIZATION CONTRIBUTION FUNCTION HAS 2 SUBSTRATES [J].
BADCOCK, DR ;
WESTHEIMER, G .
VISION RESEARCH, 1985, 25 (09) :1259-1267
[2]   THE ABSOLUTE EFFICIENCY OF PERCEPTUAL DECISIONS [J].
BARLOW, HB ;
LAL, S .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES, 1980, 290 (1038) :71-82
[3]   SHAPE FROM TEXTURE - ESTIMATION, ISOTROPY AND MOMENTS [J].
BLAKE, A ;
MARINOS, C .
ARTIFICIAL INTELLIGENCE, 1990, 45 (03) :323-380
[4]   The detection of structure in glass patterns: Psychophysics and computational models [J].
Dakin, SC .
VISION RESEARCH, 1997, 37 (16) :2227-2246
[5]  
FOGEL I, 1989, BIOL CYBERN, V61, P103, DOI 10.1007/BF00204594
[6]   MERIDIONAL ANISOTROPIES OF ORIENTATION DISCRIMINATION FOR SINE WAVE GRATINGS [J].
HEELEY, DW ;
TIMNEY, B .
VISION RESEARCH, 1988, 28 (02) :337-344
[7]   RECOGNITION OF STIMULUS ORIENTATION [J].
HEELEY, DW ;
BUCHANANSMITH, HM .
VISION RESEARCH, 1990, 30 (10) :1429-1437
[8]  
HUBEL D, 1967, J PHYSL, V160, P106
[9]   TEXTONS, THE ELEMENTS OF TEXTURE-PERCEPTION, AND THEIR INTERACTIONS [J].
JULESZ, B .
NATURE, 1981, 290 (5802) :91-97
[10]  
KASS M, 1985, 9TH P INT JOINT C AR, P944