Controlling an exposure time for digital cameras
First Claim
Patent Images
1. A digital photography device, comprising:
- a global shutter to control exposure time;
a sensor array, wherein the global shutter is in an optical path of light going to the sensor array; and
a flash to generate a pulsed illumination, wherein the shutter speed of the global shutter during a pre-flash illumination is timed to substantially match the shutter speed during the flash illumination when a picture is taken using the flash illumination based on the global shutter receiving a trigger signal from a controller.
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Abstract
Various methods, apparatuses, and systems in which a digital photography device includes a global shutter to control exposure time, a sensor array, and a flash illumination are described. The global shutter is in the optical path of light going to the sensor. The flash illumination generates a pulsed illumination. The shutter speed of the global shutter during a pre-flash illumination substantially matches the shutter speed during the flash illumination during the taking of a picture using the flash illumination based on the global shutter receiving a trigger signal from a controller.
86 Citations
29 Claims
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1. A digital photography device, comprising:
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a global shutter to control exposure time; a sensor array, wherein the global shutter is in an optical path of light going to the sensor array; and a flash to generate a pulsed illumination, wherein the shutter speed of the global shutter during a pre-flash illumination is timed to substantially match the shutter speed during the flash illumination when a picture is taken using the flash illumination based on the global shutter receiving a trigger signal from a controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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tracking an amount of light being exposed to a sensor array in a digital photography device at a first time period, a second time period, and a third time period; and transitioning a global shutter between an open state and a closed state just before and after the second and the third time period with the shutter speed during the second time period substantially matching the shutter speed during the third time period. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. An apparatus, comprising:
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means for tracking an amount of light being exposed to a sensor array in a digital photography device at a first time period, a second time period, and a third time period; and means for transitioning a global shutter between an open state and a closed state just before and after the second and the third time period with the shutter speed during the second time period substantially matching the shutter speed during the third time period. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification