Low light level colour camera
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United States of America Patent
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N/A
Issued Date -
Aug 24, 2006
app pub date -
Feb 21, 2006
filing date -
Feb 21, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Video Camera for producing video images at low light levels, such as Quarter Moonlight (10 mLux) is disclosed. The camera comprises a CCD sensor 10 selected because of its larger pixel size in comparison with other sensor designs. An angled mosaic filter 18, comprising yellow and cyan stripes is disposed directly on the image plane of the sensor, though spaced slightly from it, allowing a colour signal to be produced. The spacing defocuses the image of the mosaic and reduces intermodulation errors which were found to otherwise occur. Additional circuitry is provided in the camera to filter out the intermodulation errors, as well as remove any cross chroma errors resulting from the pattern of the mosaic filter. Black level matching circuitry is also provided to equalize the black level in each of the red, green and blue colour paths. A specific geometry for the colour pattern and pixels is disclosed for digital (pixel by pixel) decoding.
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