Stevens K A, Brookes A
Department of Computer Science, University of Oregon, Eugene 97403.
Perception. 1988;17(1):35-42. doi: 10.1068/p170035.
The tendency to interpret as figure, relative to background, those regions that are lighter, smaller, and, especially, more convex is well known. Wherever convex opaque objects abut or partially occlude one another in an image, the points of contact between the silhouettes form concave cusps, each indicating the local assignment of figure versus ground across the contour segments. It is proposed that this local geometric feature is a preattentive determiner of figure-ground perception and that it contributes to the previously observed tendency for convexity preference. Evidence is presented that figure-ground assignment can be determined solely on the basis of the concave cusp feature, and that the salience of the cusp derives from local geometry and not from adjacent contour convexity.
相对于背景而言，将较亮、较小，尤其是更凸的区域解释为图形的倾向是众所周知的。在图像中，只要凸的不透明物体相互邻接或部分遮挡，轮廓之间的接触点就会形成凹尖，每个凹尖都表明了轮廓段上图形与背景的局部分配。有人提出，这种局部几何特征是图形-背景感知的前注意决定因素，并且它促成了先前观察到的凸性偏好倾向。有证据表明，图形-背景分配可以仅基于凹尖特征来确定，并且凹尖的显著性源于局部几何形状，而不是相邻轮廓的凸性。
