Early photographic critical point synchronization system and method
First Claim
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1. A method for synchronizing a photographic lighting device to image acquisition by a camera, the method comprising:
- associating a photographic lighting device having a light emission profile with an initial critical point and a terminal critical point with the camera;
detecting a predictor signal and/or event;
determining an amount of time from the occurrence of the predictor signal and/or event until a desired time for the initiation of light emission of the photographic lighting device wherein the determining the amount of time includes utilization of a time value determined using a calibration that includes;
initiating an image acquisition sequence;
determining a start of movement of a second shutter blade; and
using a shutter speed of the image acquisition, a shutter blade travel time for the camera, the time from the occurrence of the predictor signal and/or event to the start of movement of the second shutter blade to determine the time from the predictor signal and/or event to the stopping of movement of the first shutter blade;
communicating to the photographic lighting device an instruction for the initiating light emission of the photographic lighting device at the desired time; and
initiating light emission from the photographic lighting device prior to a first shutter blade of the camera stopping movement such that the initial critical point occurs at a point in time after about 1 millisecond before the first shutter blade moves to a position that no longer obstructs light to an imaging portion of a sensor of the camera.
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Abstract
A system and method for synchronizing a photographic lighting device to image acquisition by a camera such that initiation of light emission of the photographic lighting device occurs after the first shutter blade of the camera begins to expose an image acquisition sensor of the camera to light and before X-sync associated with the first shutter blade stopping movement.
168 Citations
51 Claims
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1. A method for synchronizing a photographic lighting device to image acquisition by a camera, the method comprising:
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associating a photographic lighting device having a light emission profile with an initial critical point and a terminal critical point with the camera; detecting a predictor signal and/or event; determining an amount of time from the occurrence of the predictor signal and/or event until a desired time for the initiation of light emission of the photographic lighting device wherein the determining the amount of time includes utilization of a time value determined using a calibration that includes; initiating an image acquisition sequence; determining a start of movement of a second shutter blade; and using a shutter speed of the image acquisition, a shutter blade travel time for the camera, the time from the occurrence of the predictor signal and/or event to the start of movement of the second shutter blade to determine the time from the predictor signal and/or event to the stopping of movement of the first shutter blade; communicating to the photographic lighting device an instruction for the initiating light emission of the photographic lighting device at the desired time; and initiating light emission from the photographic lighting device prior to a first shutter blade of the camera stopping movement such that the initial critical point occurs at a point in time after about 1 millisecond before the first shutter blade moves to a position that no longer obstructs light to an imaging portion of a sensor of the camera. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for synchronizing a photographic lighting device to image acquisition by a camera, the system comprising:
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a means for associating a photographic lighting device having a light emission profile with an initial critical point and a terminal critical point with the camera; a means for detecting a predictor signal and/or event; a means for determining an amount of time from the occurrence of the predictor signal and/or event until a desired time for the initiation of light emission of the photographic lighting device wherein the determining the amount of time includes utilization of a time value determined using a calibration that includes; initiating an image acquisition sequence; determining a start of movement of a second shutter blade; and using a shutter speed of the image acquisition, a shutter blade travel time for the camera, the time from the occurrence of the predictor signal and/or event to the start of movement of the second shutter blade to determine the time from the predictor signal and/or event to the stopping of movement of the first shutter blade; a means for transmitting to the photographic lighting device an instruction for the initiating light emission of the photographic lighting device at the desired time; and a means for initiating light emission from the photographic lighting device prior to a first shutter blade of the camera stopping movement such that the initial critical point occurs at a point in time after about 1 millisecond before the first shutter blade moves to a position that no longer obstructs light to an imaging portion of a sensor of the camera.
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33. A system for synchronizing a photographic lighting device to image acquisition by a camera, the system comprising:
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a connection to a camera circuitry providing access to a camera predictor signal; a memory including information related to instructions for initiating light emission prior to a first shutter blade of the camera stopping movement such that the initial critical point occurs at a point in time after about 1 millisecond before the first shutter blade moves to a position that no longer obstructs light to an imaging portion of a sensor of the camera and including a time value determined using a calibration that includes; initiating an image acquisition sequence; determining a start of movement of a second shutter blade; and using a shutter speed of the image acquisition, a shutter blade travel time for the camera, the time from the occurrence of the predictor signal to the start of movement of the second shutter blade to determine the time from the predictor signal to the stopping of movement of the first shutter blade; a processor element configured to use the information and the camera predictor signal to generate a lighting emission initiation signal and to use the time value to determine an amount of time from the occurrence of the predictor signal until a desired time for the initiation of light emission of the photographic lighting device; and a connection to the photographic lighting device in communication with the processing element for communicating the lighting emission initiation signal to the photographic lighting device.
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34. A method for synchronizing a photographic lighting device to image acquisition by a camera, the method comprising:
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associating a photographic lighting device having a light emission profile with an initial critical point and a terminal critical point with the camera; and detecting a predictor signal and/or event; determining an amount of time from the occurrence of the predictor signal and/or event until a desired time for the initiation of light emission of the photographic lighting device, wherein the determining an amount of time includes utilization of a time value determined using a calibration that includes; initiating an image acquisition sequence; analyzing the resultant image; and modifying an adjustment factor that impacts the time value, communicating to the photographic lighting device an instruction for the initiating light emission of the photographic lighting device at the desired time; and initiating light emission from the photographic lighting device prior to a first shutter blade of the camera stopping movement such that the initial critical point occurs at a point in time after about 1 millisecond before the first shutter blade moves to a position that no longer obstructs light to an imaging portion of a sensor of the camera. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification