Support Force Constraint: A supporting object should haveĮnough strength to provide contact reactionary forces on the.Static Equilibrium: Under the static world assumption, the forces and torquesĪcting on a block should cancel out (Newton's first law).But more importantly, our approach automatically generates 3D parse graphs which describe qualitative geometric and mechanical properties of objects and relationships between objects within an image. For surface layout estimation, our method demonstrates an improvement in performance over the state-of-the-art geometric context algorithm. We also present a novel iterative 'interpretation-by-synthesis' approach where, starting from an empty ground plane, we progressively ``build up'' a physically-plausible 3D interpretation of the image. Our representation allows us to apply powerful global geometric constraints between 3D volumes as well as the laws of statics in a qualitative manner. Inspired by the 'Blocks World' work in the 1960's, we present a qualitative physical representation of an outdoor scene where objects have volume and mass, and relationships describe 3D structure and mechanical configurations. Since most current scene understanding approaches operate either on the 2D image or using a surface-based representation, they do not allow reasoning about the physical constraints within the 3D scene.

Block world problem in ai code