Print Email Facebook Twitter Human discrimination of depth of field in stereoscopic and nonstereoscopic photographs Title Human discrimination of depth of field in stereoscopic and nonstereoscopic photographs Author Zhang, T. Nefs, H.T. Heynderickx, I.E.J.R. Faculty Electrical Engineering, Mathematics and Computer Science Department Intelligent Systems Date 2014-12-01 Abstract Depth of field (DOF) is defined as the distance range within which objects are perceived as sharp. Previous research has focused on blur discrimination in artificial stimuli and natural photographs. The discrimination of DOF, however, has received less attention. Since DOF introduces blur which is related to distance in depth, many levels of blur are simultaneously present. As a consequence, it is unclear whether discrimination thresholds for blur are appropriate for predicting discrimination thresholds for DOF. We therefore measured discrimination thresholds for DOF using a two-alternative forced-choice task. Ten participants were asked to observe two images and to select the one with the larger DOF. We manipulated the scale of the scene—that is, the actual depth in the scene. We conducted the experiment under stereoscopic and nonstereoscopic viewing conditions. We found that the threshold for a large DOF (39.1 mm) was higher than for a small DOF (10.1 mm), and the thresholds decreased when scale of scene increased. We also found that there was no significant difference between stereoscopic and nonstereoscopic conditions. We compared our results with thresholds predicted from the literature. We concluded that using blur discrimination thresholds to discriminate DOF may lead to erroneous conclusions because the depth in the scene significantly affects people’s DOF discrimination ability. Subject depth of fielddiscriminationstereo photographs To reference this document use: http://resolver.tudelft.nl/uuid:9513c303-96a1-4efa-a526-540ed62c021c DOI https://doi.org/10.1068/p7616 Publisher Pion ISSN 0301-0066 Source Perception, 43 (5), 2014 Part of collection Institutional Repository Document type journal article Rights (c) 2014 Pion Files PDF 317162.pdf 1.22 MB Close viewer /islandora/object/uuid:9513c303-96a1-4efa-a526-540ed62c021c/datastream/OBJ/view