Shape, Gravity, and the Perception of the Right Angle

Maniatis, Lydia Maria

doi:10.1068/p6333

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Finally, consider a 2D image of a 3D scene in which there is a 2D planar picture of a rectangular object (Fig. 7, see Pizlo & Salach-Golyska, 1994;Maniatis, 2010a). The image is a projective transformation of the object, which includes both orthographic and perspective transformations (Pizlo, 2008, see also Pirenne, 1970).…”

Section: Recovering a Rectangular Shape From Its 2d Imagementioning

confidence: 99%

“…The recovered shapes show that the parallelograms of the table tops in the images are projections of different rectangles while the shapes of the parallelograms are identical. Maniatis (2010a) reported another illusion in which the perceived shape of a bath-tub changes from its picture in a 3D scene when the picture is seen from different positions in the scene. We drew images of parallelopipeds based on three different views of the bath-tub's picture and the model was applied to these images (Fig.…”

Section: Fig 12 (A)mentioning

confidence: 99%

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A role of rectangularity in perceiving a 3D shape of an object

Dvoeglazova,

Sawada

2024

Preprint

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Rectangularity and perpendicularity of contours are important properties of 3D shape for thevisual system and the visual system can use them as a priori constraints for perceiving shape veridically.The present article provides a comprehensive review of prior studies of the perception of rectangularityand perpendicularity and it discusses their effects on 3D shape perception from both theoretical andempirical approaches. It has been shown that the visual system is biased to perceive a rectangular 3Dshape from a 2D image. We thought that this bias might be attributable to the likelihood of arectangular interpretation but this hypothesis is not supported by the results of our psychophysicalexperiment. Note that the perception of a rectangular shape cannot be explained solely on the basis ofgeometry. A rectangular shape is perceived from an image that is inconsistent with a rectangularinterpretation. To address this issue, we developed a computational model that can recover arectangular shape from an image of a parallelopiped. The model allows the recovered shape to beslightly inconsistent so that the recovered shape satisfies the a priori constraints of maximumcompactness and minimal surface area. This model captures some of the phenomena associatedwith the perception of the rectangular shape that were reported in prior studies. This finding suggeststhat rectangularity works for shape perception by incorporating it with some additional constraints.

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Section: Recovering a Rectangular Shape From Its 2d Imagementioning

confidence: 99%

Section: Fig 12 (A)mentioning

confidence: 99%

A role of rectangularity in perceiving a 3D shape of an object

Dvoeglazova,

Sawada

2024

Preprint

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“…The orientations of edges are perceived in relation to the object vertical. (Figure2bafterManiatis, 2010)…”

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confidence: 99%

The problem of viewpoint II: Constraints on the structure of the pictorial percept

Maniatis

2024

Preprint

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The veridicality of percepts in the context of real-world viewing makes it easy to overlook the profound gap between the visual stimulation and the resulting visual experience. The non-veridical nature of pictorial percepts forces us to address this gap more directly. Here, I try to show that the structure of the pictorial percept reflects pressure to symmetrize not only the shape of the object, but also a. the relationship of the object to the environment and b. the relationship of the viewer to the the environment, via perceptually-imposed coordinate systems. These systems ultimately (evolutionarily) derive from real-world environmental and anatomical constraints, but are not directly tied to them. Rather, they are embedded in the physiological process instigated by the visual stimulation. I analyze the structure of the relevant coordinate systems and demonstrate their mutual interactions and effects with some cases in point, to be supplemented by a more thorough set of examples in a subsequent publication in this series.

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A role of rectangularity in perceiving a 3D shape of an object

Dvoeglazova,

Sawada

2024

Vision Research

View full text Add to dashboard Cite

Shape, Gravity, and the Perception of the Right Angle

Cited by 3 publications

References 9 publications

A role of rectangularity in perceiving a 3D shape of an object

A role of rectangularity in perceiving a 3D shape of an object

The problem of viewpoint II: Constraints on the structure of the pictorial percept

A role of rectangularity in perceiving a 3D shape of an object

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