Unified sun and sky illumination for shadows under trees
Conference
·
OSTI ID:6196767
Assume the sun, sky and clouds are represented as a raster image on a plane at infinity, and the shadows of a tree canopy are represented as a raster transparency mask on a canopy plane. Then the illumination on the ground is the correlation of these two rasters, which can be rapidly computed by Fast Fourier Transform techniques.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6196767
- Report Number(s):
- UCRL-95911; CONF-870738-3; ON: DE87014232
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS
990220* -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COLOR
COMPUTER GRAPHICS
COMPUTERIZED SIMULATION
CORRELATIONS
FOURIER TRANSFORMATION
ILLUMINANCE
IMAGE PROCESSING
INTEGRAL TRANSFORMATIONS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
PROCESSING
SHADING
SIMULATION
SUN SHADES
THREE-DIMENSIONAL CALCULATIONS
TRANSFORMATIONS
990220* -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COLOR
COMPUTER GRAPHICS
COMPUTERIZED SIMULATION
CORRELATIONS
FOURIER TRANSFORMATION
ILLUMINANCE
IMAGE PROCESSING
INTEGRAL TRANSFORMATIONS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
PROCESSING
SHADING
SIMULATION
SUN SHADES
THREE-DIMENSIONAL CALCULATIONS
TRANSFORMATIONS