合成纹理图像的视觉相似性眼动分析

Eye-movement Analysis of Visual Similarity Perception on Synthesized Texture Images

探索了当人眼视觉感知纹理图像相似性时纹理特征(整体特征和局部特征)对视觉注意过程及相似性结果选择的影响。采用PGPC纹理合成方法,分别控制纹理的整体特征和局部特征,合成具有相同整体特征和局部特征的纹理。实验分为3组纹理场景,每一组有3幅纹理图像(A,B和S),S为对比纹理图像;实验者带着"纹理A和纹理B,哪个与纹理S更相似"的视觉感知任务观察纹理场景;利用Tobii T60眼动仪记录实验过程中观察者的眼动,跟踪获取89位实验者的眼动数据(眼动数据度量指标包含感兴趣区域内注视点散度和不同感兴趣区域间的眼跳次数);通过Tobii studio导出眼动数据,并基于R软件进行了方差分析和配对T检验等统计分析。通过对3组纹理图像的注视轨迹图及热点图的分析,验证了纹理整体特征和局部特征对视觉感知过程中的注视模式和相似性结果的选择有影响。实验结果表明:1)对于全局特征与对比纹理图像一致的纹理,其眼动注视点分散,而对于局部特征与对比纹理图像一致的纹理,其眼动注视点集中。2)纹理组相似性的最终选择结果与纹理组内不同纹理图像间的视觉搜索行为有关。

Global features and local features are very important for texture visual perception.This paper investigated the influence of the global features and local features of texture on the eye movement pattern and the relationship between the eye movement pattern and visual similarity selection.Firstly,the texture images were synthesized by separately controlling global textural features and local textural features with primitive,grain,and point configuration（PGPC）texture model,which is a mathematical morphology based texture model.In the experiment,three scenes were utilized.For each scene,three textures（A,B,and S）were included.Secondly,an experiment was conducted on visual similarity selection to acquire eye movement data while the subjects were viewing the visual similarities of texture scenes under the task of＂Which texture is more similar to texture S,texture A or texture B？＂.Experimental data were obtained with an eye tracker Tobii T60 by conducting two tests on 89 subjects.The collected eye-tracking data were analyzed in terms of fixation point variance in each ROI and fixation transfer count between different ROIs.Analysis results indicate that the global features and local features of texture influence the eye-movement pattern,namely,the texture image that is globally similar to the compared texture contains dispersed fixation points,and the texture image that is locally similar to the compared texture contains concentrated fixation points.Besides,the final visual similarity selection is related to the visual search between different ROIs.