Limits...
Local Solid Shape

View Article: PubMed Central - PubMed

ABSTRACT

Local solid shape applies to the surface curvature of small surface patches—essentially regions of approximately constant curvatures—of volumetric objects that are smooth volumetric regions in Euclidean 3-space. This should be distinguished from local shape in pictorial space. The difference is categorical. Although local solid shape has naturally been explored in haptics, results in vision are not forthcoming. We describe a simple experiment in which observers judge shape quality and magnitude of cinematographic presentations. Without prior training, observers readily use continuous shape index and Casorati curvature scales with reasonable resolution.

No MeSH data available.


Related in: MedlinePlus

Interquartile ranges for the Casorati curvature settings pooled over all sessions of single observers. Notice that the functional dependencies are idiosyncratic, although one believes to spot a tendency—doing considerable coarse graining by eye—of a monotonic increase.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
getmorefigures.php?uid=PMC5016822&req=5

fig7-2041669515604063: Interquartile ranges for the Casorati curvature settings pooled over all sessions of single observers. Notice that the functional dependencies are idiosyncratic, although one believes to spot a tendency—doing considerable coarse graining by eye—of a monotonic increase.

Mentions: Observers were able to use the curvature scale too (Figure 6). This was more difficult because they had to keep the unit reference example in mind at all times. In a simultaneous comparison, it is likely that they would do much better. The results suggest a Weber fraction (Helmholtz, 1867) of about 10%, of course, with a considerable absolute plateau. This is at most twofold the discrimination threshold for planar ellipses. In view of the obviously large idiosyncratic spreads (Figure 7), there is little more that could be said.Figure 6.


Local Solid Shape
Interquartile ranges for the Casorati curvature settings pooled over all sessions of single observers. Notice that the functional dependencies are idiosyncratic, although one believes to spot a tendency—doing considerable coarse graining by eye—of a monotonic increase.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
Show All Figures
getmorefigures.php?uid=PMC5016822&req=5

fig7-2041669515604063: Interquartile ranges for the Casorati curvature settings pooled over all sessions of single observers. Notice that the functional dependencies are idiosyncratic, although one believes to spot a tendency—doing considerable coarse graining by eye—of a monotonic increase.
Mentions: Observers were able to use the curvature scale too (Figure 6). This was more difficult because they had to keep the unit reference example in mind at all times. In a simultaneous comparison, it is likely that they would do much better. The results suggest a Weber fraction (Helmholtz, 1867) of about 10%, of course, with a considerable absolute plateau. This is at most twofold the discrimination threshold for planar ellipses. In view of the obviously large idiosyncratic spreads (Figure 7), there is little more that could be said.Figure 6.

View Article: PubMed Central - PubMed

ABSTRACT

Local solid shape applies to the surface curvature of small surface patches—essentially regions of approximately constant curvatures—of volumetric objects that are smooth volumetric regions in Euclidean 3-space. This should be distinguished from local shape in pictorial space. The difference is categorical. Although local solid shape has naturally been explored in haptics, results in vision are not forthcoming. We describe a simple experiment in which observers judge shape quality and magnitude of cinematographic presentations. Without prior training, observers readily use continuous shape index and Casorati curvature scales with reasonable resolution.

No MeSH data available.


Related in: MedlinePlus