## EE/CSE 576: Image Understanding## Spring 2001 |

#If there are no circular arcs detected, the whole section (including the comment lines) will be missing.<image cols><image rows>#Lineszero or more line descriptions# #CircularArcsone or more circular arc descriptions

A line description is a single line with 13 numbers:

int | line ID |

int | string ID (see chainpix output format) |

float | start point column |

float | start point row |

float | end point column |

float | end point row |

float | midpoint column |

float | midpoint row |

float | length |

float | variance in length parallel to direction of line |

float | variance in length perpendicular to direction of line |

float | orientation of line (0 <= theta < pi) |

float | variance in orientation |

A circular arc description is a single line with 20 numbers:

int | arc ID |

int | string ID (see chainpix output format) |

int | direction (-1 = clockwise, 1 = anticlockwise) |

float | origin column |

float | origin row |

float | start point column |

float | start point row |

float | midpoint column |

float | midpoint row |

float | endpoint column |

float | endpoint row |

float | midpoint of line joining endpoints column |

float | midpoint of line joining endpoints row |

float | radius |

float | length |

float | variance of length in parallel direction |

float | variance of length in perpendicular direction |

float | width (distance between endpoints of arc) |

float | height (distance between midpoint of line joining endpoints and midpoint of arc) |

float | orientation of line joining origin to midpoint |