---
title: "Inferring the Direction of the Sun from Intensity Values on a Generalised Cone"
authors:
  - "Mike Brady"
doi: ""
url: "https://ijcai.org/proceedings/1979/24"
pdf: "https://ijcai.org/proceedings/1979/0024.pdf"
venue: "Proceedings of the Sixth International Joint Conference on Artificial Intelligence"
year: 1979
pages: ""
track: ""
keywords:
---

# Inferring the Direction of the Sun from Intensity Values on a Generalised Cone

Mike Brady

*Proceedings of the Sixth International Joint Conference on Artificial Intelligence*.

## Abstract

An initial attempt to synthesise some of the ideas of Marr and Horn about surface geometry and lighting is described. In some situations the direction of the sun can be deduced from intensity values on a section of a generalised cone which flanks a bounding contour.