Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1998-07-22
2000-06-20
Mack, Ricky
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359583, G02B 2714, G02B 110
Patent
active
060784296
ABSTRACT:
A color separating prism is disclosed for use in an electronic imaging systems such as a video or digital still-image camera. The prism separates an incoming light beam into red, green and blue light components and directs the separated light components onto adjacent imaging sensors. Beam-splitting interfaces of the prism are optically configured to admit approximately ten to twenty percent of a violet light contained in the incoming light beam into the red color channel. The prism may beneficially be optically coupled to a light-rejecting filter or mirror which rejects undesired far-red, far-violet and blue-green components of the light beam. In this manner, the resultant red, green and blue channels approximate a set of substantially non-negative color matching functions to facilitate highly colorimetrically accurate color imaging and thereby reduce or eliminate the need for post-imaging color correction.
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Blanksby et al, Noise Performance of a Color CMOS Photogate Image Sensor, IEDM 97-205 pp.8.6.1-8.6.4 (1997).
Juenger, Andrew K., Color Sensitivity Selection for Electronics Still Cameras Based on Noise Considerations in Photographic Speed Maximization, IS&T's 1998 PICS Conference.
Hunt, R. W. G., The Reproduction of Colour, Fifth Edition, Fountain Press, Kingston-upon-Thames, 1995 (Ch. 19, especially 19.12 and figure 19.9).
Foveon, Inc.
Mack Ricky
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