Shutter speed control method and system
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorKatsuyuki Kise
Life of this patent
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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.
Claims18
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.
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:
- 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.
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:
- 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.
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:
- 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.
Dependencies are inferred from the claim text.