WebResults reveal that lightness constancy significantly increases when: (i) the luminance ratio at the contextual edge is larger than that at the mediating edge creating an impossible shadow, and (ii) the reflectance of the contextual background is lower than that of the mediates one. 18 PDF View 1 excerpt, cites background Web1. okt 2024 · This phenomenon, referred to as edge loss, yields erroneous, underestimated reflectance measurements. In the case of colored and opalescent materials, the impact of edge loss on the measured ...
Lightness constancy: Ratio invariance and luminance profile
Webedge from a reflectance edge on the one hand, and from a translucent edge on the other. Distinct from luminance junctions, these features are global characteristics of the … Web15. jún 1980 · A simple two-stage lateral-inhibition mechanism is described that permits edges due to changes in surface illumination and orientation to be distinguished directly … franceclean.fr
The perception of shading and reflectance - Massachusetts …
Web1. jan 2015 · Theoretical Importance. Mach bands are a common visual phenomenon and can be observed both on reflectance edges (as presented on Fig. 1) and on illumination edges, where a penumbra is created.They served in a number of vision paradigms because they are a robust phenomenon easily created in the laboratory and because they … Web1. sep 1994 · Edge integration and competing operations According to Gilchrist (1988), the proper framework for understanding lightness constancy and the con- ditions that provoke its partial failure is a model based not only local properties of the image, but also on the overall interpretation of edges, as due to illumination or reflectance changes (edge ... Webthe same when an illumination edge crosses one or more reflectance edges. In other words, in the constancy condition the mediating edge was seen as an illumination edge because the context revealed another luminance edge sharing the same ratio. However, it should be noted that in the contrast condition observers chose a patch france coal power plants