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parms.doc
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1995-05-24
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Global, Fixed Parameters
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MIN_LINE_LENGTH: Minimum distance needed to group two corner or
hypothesize a virtual corner. Expected minimum edge
length of building in the scene. (Pixels).
Currently fixed at 5 pixels.
LINE_SEARCH_DIST: Maximum distance searched when linking corners. (pixels)
Fixed at 500 pixels.
Parameters Used in Computing Intersections
--------------------------------------------------------------------------------
ANGLE_THRESH: Allowed error in angle. (radians)
Min: .05 Max: 0.25
LINE_ENDPOINT_WINDOW: Line enpoints must lay within window to detect
intersection. Gives window radius in (pixels)
Min: 2.0 Max: 11.0
Parameters Using in Linking Intersections
--------------------------------------------------------------------------------
SEARCH_ANGLE: Angle of search cone from intersection i1. Used
when searching for corners that are oriented
towards each other. Given an intersection axis
from i1, the angle subtends the axis to create
a search cone each edge of the cone is
'LINE_SEARCH_DIST' long. Any two corners that
lay within each other's cones are "compatible".
(radians)
Fixed: 0.005
LINE_SWEEP_COLUMN: The rectangular width of the search region between
two corners for an edge response mask sweep.
A mask is swept along the line between two
compatible corners, and along a number of parallel
lines on either side, given by the sweep column.
Min: 1 Max: 6
MIN_EDGE_MAGNITUDE: Minimum edge response needed to classify a pixel
as "edge".
Min: 3.0 Max: 10.0
MAX_EDGE_VARIANCE Maximum allowed change in edge magnitude variance
over previous n-1 samples that will allow sample
"n" to be classified as "edge".
Min: 5.0 Max: 5.0
MIN_LINE_SUPPORT: Percentage of image pixels between two interesections
that need to be classified as "edge" for a link
to occur.
TOKEN_SUPPORT: Percentage of Boldt line coverage needed between
two intersections for a link to occur.
Min: 0.6 Max: 0.8
TOKEN_WINDOW: Both endpoints of Boldt lines must lay within
a rectangular window defined by the two
intersection points and a width of "token_window"
in order for the boldt line to contribute
to line support.
Min: 1 Max: 8