Electronic level device and level staff used for electronic level device
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United States of America Patent
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Sep 1, 2015
Grant Date -
Jul 19, 2012
app pub date -
Jan 11, 2012
filing date -
Jan 13, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic level includes a wide-angle lens system having a two-dimensional imaging element configured to form thereon a picture image including an image of a level staff assigned with a code pattern, an extraction part configured to extract the image of the level staff from the picture image, a height-level measurement value calculation part configured to obtain a height-level measurement value indicated by a portion of the code pattern in the image of the level staff extracted by the extraction part, the portion of the code pattern located at a collimation optical axis of the wide-angle lens system, and a calculation part configured to calculate a collimation height from the height-level measurement value.
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