Pictorial relief for equiluminant images

Pictorial relief for equiluminant images

Van Doorn, A.J.
De Ridder, H.
Koenderink, J.J.

Industrial Design Engineering

Human Information Communication Design

2005-03-18

Pictorial relief depends strongly on “cues” in the image. For isoluminant renderings some cues are missing, namely all information that is related to luminance contrast (e.g., shading, atmospheric perspective). It has been suggested that spatial discrimination and especially pictorial space suffer badly in isoluminant conditions. We have investigated the issue through quantitative measurement of pictorial depth-structure under normal and isoluminant conditions. As stimuli we used monochrome halftone photographs, either as such, or “transposed” to Red/Green or Green/Red hue modulations. We used two distinct methods, one to probe pictorial pose (by way of correspondences settings between pictures of an object in different poses), the other to probe pictorial depth (by way of attitude settings of a gauge figure to a perceptual “fit”). In both experiments the depth reconstructions for Red/Green, Green/Red and monochrome conditions were very similar. Moreover, observers performed equally well in Red/Green, Green/Red and monochrome conditions. Thus, the general conclusion is that observers did not do markedly worse with the isoluminant Red/Green and Green/Red transposed images. Whereas the transposed images certainly looked weird, they were easily interpreted. Much of the structure of pictorial space was apparently preserved. Thus the notion that spatial representations are not sustained under isoluminant conditions should be applied with caution.

pictorial space
isoluminant images
pictorial relief
picture perception
pictorial cues

http://resolver.tudelft.nl/uuid:55d5d114-33ad-4897-be80-8bb72b691631

SPIE

0277-786X

Proceedings of SPIE, 2005 vol. 5666

Institutional Repository

conference paper

(c)2005 Van Doorn, A.J., De Ridder, H., Koenderink, J.J.