{"id":14301,"date":"2011-06-07T10:07:12","date_gmt":"2011-06-07T10:07:12","guid":{"rendered":"http:\/\/www.labri.fr\/perso\/barla\/blog\/?p=14301"},"modified":"2014-02-20T13:33:19","modified_gmt":"2014-02-20T13:33:19","slug":"wmp-2011","status":"publish","type":"post","link":"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=14301","title":{"rendered":"WMP 2011"},"content":{"rendered":"<p id=\"top\" \/>Workshop on material perception @ Giessen University<\/p>\n<h3>Bart Anderson<\/h3>\n<ul>\n<li>Rotating specular maps breaks material perception while keeping skew statistics.<\/li>\n<li>But modifying skew without modifying orientations between diffuse and specular layers makes a texture look more glossy.<\/li>\n<li>Previous work has tried rotating specular maps in image space and it breaks gloss perception.<\/li>\n<li>Here thay keep the same shape, but change the 3D orientation of the lighting environment only for the specular layer. Perception seems correlated to the amount of lighting anisotropy.<\/li>\n<li><em>Couldn&#8217;t we be able to measure congruence by relating normal and reflected view vector fields ?<\/em> <em>Actually they are indeed related by slant.<\/em><\/li>\n<li><em>Wouldn&#8217;t it be more interesting to modify the shape for each ter, playing with different scales? Indeed, specularities tend to reveal higher shape frequencies than diffuse shading.<\/em><\/li>\n<li><em>And how much can you move from a diffuse to a specular shading and still perceive it as specular (w\/ or w\/o motion)?<\/em><\/li>\n<\/ul>\n<h3>Roland Fleming<\/h3>\n<ul>\n<li><em>If specularities are really aligned with (extrinsic) minimum curvature directions then why would flow singularities be a problem?<\/em><\/li>\n<li><em>Texture and specular flows are different, but what about diffuse flows ?<\/em><\/li>\n<li>Changing either saturation or value of transparent objects leads to changes in perceived thickness or opacity.<\/li>\n<li><em>What could we do if we had more information like normals or view vectors?<\/em><\/li>\n<li>Hue, saturation and value can be directly related to the distribution of wavelengths in a spectrum.<\/li>\n<li>We could imagine a more formal analysis of how spectrum is modified through multiple bounces in terms of hue, saturation and value (a spectral analysis of light transport).<\/li>\n<\/ul>\n<h3>Katja Doerschner<\/h3>\n<ul>\n<li>Velocity of a specular feature is inversely related to surface curvature.<\/li>\n<li>In the specular case, image features change in appearance too rapidly (untrackable) and generate sources and sinks.<\/li>\n<li>Divergence is used to measure contractions [Kappers et al. 1995]<\/li>\n<li><em>Some objects neither appear matte or shiny, but just weird.<\/em><\/li>\n<\/ul>\n<h3>Anya Thurlbert<em> <\/em><\/h3>\n<ul>\n<li>Cone contrast coordinates better correspond to stimuli organisation [Eskeur 1999]<em>.<\/em><\/li>\n<li>The hue angle remains approximately the same under changing illumination.<\/li>\n<\/ul>\n<h3>Sylvia Pont<em> <\/em><\/h3>\n<ul>\n<li><em>In what BRDF<\/em><em> models has asperity scattering been incorporated? How is it distributed across an object surface?<\/em><\/li>\n<li>There seems to be an important context effect in material (glossiness) perception.<\/li>\n<li><em>What about the influence of aera light size? It seems to really matter to photographers&#8230;<\/em><\/li>\n<\/ul>\n<h3>Graham Finlayson<\/h3>\n<ul>\n<li>The ratio of cone outputs relative ti the surrounding is a simple model of the effect of context on color perception (the gray world assumption).<\/li>\n<li>Spectral sharpening seems to be a more elaborate consideration of the contexte effect, and it is claimed to be an elegant simplification of [Philipona &amp; O&#8217;Regan].<\/li>\n<li>(r^3+g^3+b^3)\/(r*g*b) &#8211; 3 seems to be a good predictor for color naming. <em>Could it be used for abstraction purposes, for instance using morphology?<\/em><\/li>\n<\/ul>\n<h3>Reinhard Klein<em><\/em><\/h3>\n<ul>\n<li>BTFs<em> <\/em>are useful for asperity scattering, local shadowing, inter-reflection effects, and relief occlusions.<\/li>\n<li>Capture material-specific BTFs using strong apriori on repetitions and structure.<\/li>\n<li>Applied to leather and other cellular structures using texture synthesis for editing.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Workshop on material perception @ Giessen University Bart Anderson Rotating specular maps breaks material perception while keeping skew statistics. But modifying skew without modifying orientations between diffuse and specular layers makes a texture look more glossy. Previous work has tried rotating specular maps in image space and it breaks gloss perception. Here thay keep the &#8230; <a title=\"WMP 2011\" class=\"read-more\" href=\"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=14301\" aria-label=\"Read more about WMP 2011\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-14301","post","type-post","status-publish","format-standard","hentry","category-talks"],"_links":{"self":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/14301","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14301"}],"version-history":[{"count":22,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/14301\/revisions"}],"predecessor-version":[{"id":34781,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/14301\/revisions\/34781"}],"wp:attachment":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}