Controlling an exposure time for digital cameras
First Claim
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1. A digital photography device comprising:
- a sensor array configured to receive light from an object propagating along an optical path;
a mechanical global shutter disposed in the optical path and characterized by a first shutter speed implemented during a pre-flash illumination period that is substantially equal to a second shutter speed implemented during a flash illumination period, wherein shutter speed measures how quickly the mechanical global shutter opens and closes to begin and end exposing the sensor array to light;
a flash configured to generate pulsed illumination; and
a controller in electrical communication with the flash, wherein the controller is configured to provide a trigger signal to the flash.
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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.
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Citations
10 Claims
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1. A digital photography device comprising:
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a sensor array configured to receive light from an object propagating along an optical path; a mechanical global shutter disposed in the optical path and characterized by a first shutter speed implemented during a pre-flash illumination period that is substantially equal to a second shutter speed implemented during a flash illumination period, wherein shutter speed measures how quickly the mechanical global shutter opens and closes to begin and end exposing the sensor array to light; a flash configured to generate pulsed illumination; and a controller in electrical communication with the flash, wherein the controller is configured to provide a trigger signal to the flash. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification