---
title: "Obtaining Surface Orientation from Texels under Perspective Projection"
authors:
  - "Tu-ichi Ohta"
  - "Kiyoshi Maenobu"
  - "Toshiyuki Sakai"
doi: ""
url: "https://ijcai.org/proceedings/1981/143"
pdf: "https://ijcai.org/proceedings/1981/0143.pdf"
venue: "Proceedings of the Seventh International Joint Conference on Artificial Intelligence"
year: 1981
pages: "746-750"
track: "Vision: Low-level"
keywords:
---

# Obtaining Surface Orientation from Texels under Perspective Projection

Tu-ichi Ohta, Kiyoshi Maenobu, Toshiyuki Sakai

*Proceedings of the Seventh International Joint Conference on Artificial Intelligence*, pages 746-750.

## Abstract

A neav method to obtoln 1u.rfQC• orielltotion of testi.U'Ol plone u.nder per1pectille projection u de1cribed. Flntt~. 1118 deri11e o 2-0 Affine tro111formotion which oppro:r:imote1 the dutortion of te:r:el potter111 u.ntler per1pectille projection. Then 111• pre1e11t o method to obtoln the llollilhinr line of the plone from the oreo of te:r:ell in the picture. It con obtoln o IIOIIilmnr point from 011 orbi.trory pctir of te:r:eu; when 11 tenu .e:r:i1t, 11 C2 ""'"""'"' pointl con be obtoined. An olrorithm to 1ollle the 2-D Affine motri:r: between two potter111 u ctUo pre1ented. It reinforce• the method to be oppUcoble to o testu.re which i1 co111titu.ted from more thon two kintl1 of tent potter111. E:sperimentl ore performed ~ &Ulnll ortificioU-y renerctted testu.re1.