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Projective geometry-aware anisotropic convolutional filters Poster @ Pacific Ballroom #147 Renata Khasanova, Pascal Frossard, LTS4, EPFL, Switzerland Motivation Photo credits: https://www.ti.uni-bielefeld.de/html/research/equipment.html

  1. Projective geometry-aware anisotropic convolutional filters Poster @ Pacific Ballroom #147 Renata Khasanova, Pascal Frossard, LTS4, EPFL, Switzerland

  2. Motivation Photo credits: https://www.ti.uni-bielefeld.de/html/research/equipment.html https://www.t3.com/features/best-drone � 2 https://www.zemax.com/blog/zemax-blog/october-2017/getting-to-the-finish-line-faster-optical-technolo

  3. Omnidirectional camera representation ? Spherical surface Rectangular representation � 3

  4. Geometric distortion of equirectangular images � 4

  5. Geometric distortion of cube-map images � 5

  6. Graphs for geometry modelling � 6

  7. Graphs for geometry modelling pixel — node pixel’s intensity — node’s signal � 7

  8. Geometry aware graph filters Idea: adapt filters depending on image location Example of a filter applied to equirectangular projection � 8

  9. Geometry aware graph filters Multiple directed graphs for anisotropic filters Example of filters � 9

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  12. Classification: adaptation to various projective geometries Dataset — projected MNIST Spherical (S) Modified spherical (MS1, MS2, MS3) Fish-eye stereographic projection (F) Cube-map (CM) � 12

  13. Classification results Method S MS1 MS2 MS3 F CM 69.4 64.3 64.1 62.8 71.8 40.0 regular graph (w=1) regular graph (w=1/d) 69.8 63.4 64.5 62.5 70.2 40.5 GA graph (w=1/d) 70.2 63.9 62.5 62.8 72.1 44.2 ConvNets 94.2 91.3 91.2 90.5 93.4 79.4 SphereNet 94.8 — — — — — SphericalCNN 95.2 84.5 83.3 80.9 94.9 — Ours 96.9 95.1 95.3 94.9 95.7 84.3 � 13

  14. Compression Cube-map projection of SUN* dataset with 360-indoor images *https://groups.csail.mit.edu/vision/SUN/ � 14

  15. Decompression challenges � 15

  16. Visual decompression result Original Balle et. al (2017) Ours � 16

  17. Summary � Novel graph construction approach to define a filter, which adapts to the specific geometry of the wide-angle images � Our filters are anisotropic, which permits richer representation � Our filters can be applied to a wider class of tasks compared with standard graph- based filters � Our approach reaches state-of-the-art performance on classification and compression tasks Thank you! Poster: @ Pacific Ballroom #147 Code: https://github.com/RenataKh/GAfilters � 17

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1 Handling exceptions (III) Handling exceptions (II) n try -statements can be nested and

2.6 Error, exception and event Error and exception handling in handling Pascal n There are conditions that have to be fulfilled by a n While errors definitely can occur in Pascal programs, program that sometimes are not fulfilled, which Pascal

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