Method for changing a natural image based on a light environment in the natural image
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United States of America Patent
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Nov 5, 1996
Grant Date -
N/A
app pub date -
Jun 3, 1992
filing date -
Jun 4, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A function of simulating change of weather and time in one scene by changing a sky area and an object area in a natural image while maintaining a relationship therebetween. The natural image is separated into a sky area and an object area excluding the sky area. The color of the object area is generated from a reflection model of the object, based on the color of sunlight, the color of a sky light, and a reflectance of the object. The sky light is determined by averaging pixel values of the sky area. The color of the sky light can be determined based on the color of the sunlight and meteorological conditions such as clouds and fog. The color of the sunlight, the meteorological conditions and the color of the sky light can be determined by specifying parameters representing time and weather. By changing the parameters, a simulation for changing the time and the weather can be performed on the entire natural image.
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Cited Art Landscape
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