Shutter speed control method and system
First Claim
Patent Images
1. A shutter speed control method for controlling a shutter speed of a stereoscopical imaging apparatus which images an object from a plurality of different directions, the method comprising the steps of:
- dividing the image of the object produced by the imaging apparatus into a plurality of zones;
averaging a brightness for each zone to produce an average brightness value for each zone;
for each zone, determining a zone correction level with respect to a present shutter speed of the imaging apparatus, based upon the average brightness value for the zone;
producing a shutter speed correction level based upon the determined zone correction levels; and
correcting said present shutter speed of the imaging apparatus based on the shutter speed correction level, to thereby obtain a new shutter speed for the imaging apparatus.
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Abstract
A distance detecting system for detecting a distance to an object from a moving body such an automobile by means of imaging pictures by an imaging apparatus and processing pictures into distance distribution information, the imaging apparatus having a capability of always providing proper image pictures under rapidly changing illuminance conditions, whereby securing an accuracy in the distance detecting system.
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Citations
18 Claims
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1. A shutter speed control method for controlling a shutter speed of a stereoscopical imaging apparatus which images an object from a plurality of different directions, the method comprising the steps of:
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dividing the image of the object produced by the imaging apparatus into a plurality of zones; averaging a brightness for each zone to produce an average brightness value for each zone; for each zone, determining a zone correction level with respect to a present shutter speed of the imaging apparatus, based upon the average brightness value for the zone; producing a shutter speed correction level based upon the determined zone correction levels; and correcting said present shutter speed of the imaging apparatus based on the shutter speed correction level, to thereby obtain a new shutter speed for the imaging apparatus. - View Dependent Claims (2, 3)
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4. A shutter speed control method for controlling a shutter speed of a stereoscopical imaging apparatus which images an object from a plurality of different directions, the method comprising the steps of:
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designating at least one particular zone of the image of the object produced by the imaging apparatus; calculating a frequency distribution of brightness levels in the particular zone; producing a brightness histogram for the particular zone from the calculated frequency distribution of brightness levels; calculating a correction level with respect to a present shutter speed of the imaging apparatus based upon the brightness histogram; and correcting the present shutter speed of the imaging apparatus based upon the correction level, to thereby produce a new shutter speed for the imaging apparatus. - View Dependent Claims (5, 6)
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7. A shutter speed control system for controlling a shutter speed of a stereoscopical imaging apparatus which images an object from a plurality of different directions, the system comprising:
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zone dividing means for dividing the image of the object produced by the imaging apparatus into a plurality of zones; brightness averaging means for averaging a brightness of each zone and for producing an average brightness value for each zone; and correction level determining means for determining a zone correction level with respect to a present shutter speed of the imaging apparatus for each zone, in response to the average brightness value for the zone, and for producing a shutter speed correction level based upon the determined zone correction levels. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A shutter speed control system for controlling a shutter speed of a stereoscopical imaging apparatus which images an object from a plurality of different directions, the system comprising:
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zone designating means for designating at least one particular zone of the image of the object produced by the imaging apparatus; frequency distribution producing means for calculating a frequency distribution of brightness in the particular zone and for producing a brightness histogram for the particular zone from the calculated frequency distribution of brightness; correction level calculating means for calculating a correction level with respect to a present shutter speed of the imaging apparatus in response to the brightness histogram; and shutter speed correcting means for correcting the present shutter speed of the imaging apparatus in response to the calculated correction level, to thereby produce a new shutter speed for the imaging apparatus. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification