Image analysis – Histogram processing – For setting a threshold
Patent
1992-06-03
1996-11-05
Zimmerman, Mark K.
Image analysis
Histogram processing
For setting a threshold
395131, 382167, G06T 1550
Patent
active
055726356
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.
REFERENCES:
patent: 4645459 (1987-02-01), Graf et al.
patent: 5276779 (1994-01-01), Statt
Klinker et al., "The Measurement of Highlights in Color Images", International Journal of Computer Vision, 2, 7-32 (1988).
Takagi et al. "Accurate Rendering Technique Based of Colormetric Conception", Computer Graphics, vol. 24, No. 4, Aug. 1990, pp. 263-272.
Nishita et al., "Continuous Tone Representation of Three-Dimensional Objects Illuminated by Sky Light", Computer Graphics, vol. 20, No. 4, Aug. 1986, pp. 125-132.
Kato Makoto
Miyaoka Shinichiro
Takizawa Yuri
Hitachi , Ltd.
Zimmerman Mark K.
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