{"id":40218,"date":"2019-12-03T07:50:59","date_gmt":"2019-12-03T07:50:59","guid":{"rendered":"http:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40218"},"modified":"2021-05-24T19:45:32","modified_gmt":"2021-05-24T19:45:32","slug":"shapes-in-space-time","status":"publish","type":"post","link":"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40218","title":{"rendered":"Shapes &#038; layout"},"content":{"rendered":"<p id=\"top\" \/>\n<h3 class=\"wp-block-heading\">Shape structure<\/h3>\n\n\n\n<p>Synopsis: Comment on Kunsberg &amp; Zucker papers on shape ! Go back to papers on line-based rendering !<br>Veridicality of shape: depends on interpretability of image patterns.<\/p>\n\n\n\n<p>Ex1: occluding contours are clear-cut (provided enough patterns are available for accretion\/deletion)<br>Ex2: parabolic curves create loci of fusion\/separation of highlights (provided highlights are present)<br>Ex3: creases depend on scale, since zooming in will reveal a high curvature (still depends on shading)<br>Ex4: critical contours are more like skeletons of a smooth potential shadingpattern >>> much less prone to &#8220;veridicality&#8221;<\/p>\n\n\n\n<p>In a nutshell, some aspects of shape robustly and directly reveal to ourselves, other require exploration (and memory!)<\/p>\n\n\n\n<p>Line drawing is NOT a way to summarize veridical shape since its goal is to reproduce the image cues to shape.<br>Hence it makes sense to have lighting-dependent line-based rendering, at least for features like critical contours&#8230;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A history of violence<\/h3>\n\n\n\n<p>Global transformations such as twisting or bending of a shape are  usually visible on the resultant shape, even if the manipulations have  taken place in a distant past. There are thus properties of the shape (of its surface features, of the  distribution of its volume) that are indicative of these transformations. [Mention papers by Roland and colleagues that studied this]. <br> <br>One needs to detect that original shape properties have been tampered  with, then find a global transformation that could explain this  tampering visible at multiple locations on an object. This might have many similarities with the perception of material  properties, where the material may be seen to act as a filter: the  overall appearance of reflections is here explained by a common  transformation applied to them (say a blur). There might be some points in common indeed: one needs properties of the  original shape to be sufficiently salient so that they can clearly  appear in a deformed state afterwards. There might be some differences as well: the shape transformation might  actually create surface features that were not there before, such as  wrinkles, or folds for instance. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bombastic lettering<\/h3>\n\n\n\n<p>Look at complex graffiti and design-ish fonts, the way they convey  minimal shape and layout too! <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Shape structure Synopsis: Comment on Kunsberg &amp; Zucker papers on shape ! Go back to papers on line-based rendering !Veridicality of shape: depends on interpretability of image patterns. Ex1: occluding contours are clear-cut (provided enough patterns are available for accretion\/deletion)Ex2: parabolic curves create loci of fusion\/separation of highlights (provided highlights are present)Ex3: creases depend on &#8230; <a title=\"Shapes &#038; layout\" class=\"read-more\" href=\"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40218\" aria-label=\"Read more about Shapes &#038; layout\">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":[772],"tags":[],"class_list":["post-40218","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40218","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=40218"}],"version-history":[{"count":3,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40218\/revisions"}],"predecessor-version":[{"id":40469,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40218\/revisions\/40469"}],"wp:attachment":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}