Videostroboscopy of vocal cords with CMOS sensors
First Claim
Patent Images
1. A method for providing an image comprising:
- continuously determining a frequency of a patient'"'"'s vocal cords during a videostroboscopy procedure;
strobing light from a light source at a strobing frequency that substantially matches the patient'"'"'s vocal cord frequency;
receiving a plurality of pulses of light from the light source as strobing input by a CMOS sensor during a pixel readout portion of a readout sequence and during a blanking portion of a readout sequence; and
reading out information obtained from the CMOS sensor to a processor, wherein at least one of the plurality of pulses of light from the light source is suppressed during one or both of the pixel readout portion of the read out sequence and the blanking portion of the readout sequence such that an aggregate amount of illumination which is the sum of the amplitude and the duration of all nonsuppressed pulses for a first blanking period is equal to the aggregate amount of illumination level of in a successive blanking period.
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Abstract
The disclosure relates and extends to a light source having a strobing or pulsing sequence suitable for use with a CMOS sensor that does not require, have, or use a global shutter. Instead, the CMOS sensor synchronizes the strobing input with the blanking portion of the sensor readout pattern and disables the strobing during sensor readout, or when the strobing would otherwise leave artifacts in the image. The CMOS sensor freezes its readout during the strobing.
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Citations
14 Claims
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1. A method for providing an image comprising:
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continuously determining a frequency of a patient'"'"'s vocal cords during a videostroboscopy procedure; strobing light from a light source at a strobing frequency that substantially matches the patient'"'"'s vocal cord frequency; receiving a plurality of pulses of light from the light source as strobing input by a CMOS sensor during a pixel readout portion of a readout sequence and during a blanking portion of a readout sequence; and reading out information obtained from the CMOS sensor to a processor, wherein at least one of the plurality of pulses of light from the light source is suppressed during one or both of the pixel readout portion of the read out sequence and the blanking portion of the readout sequence such that an aggregate amount of illumination which is the sum of the amplitude and the duration of all nonsuppressed pulses for a first blanking period is equal to the aggregate amount of illumination level of in a successive blanking period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing an image comprising:
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determining a frequency of a patient'"'"'s vocal cords during a videostroboscopy procedure; strobing light from a light source at a strobing frequency that substantially matches the patient'"'"'s vocal cord frequency; receiving a plurality of pulses of light from the light source as strobing input by a CMOS sensor during a pixel readout portion of a readout sequence and during a blanking portion of a readout sequence; reading out information obtained from the CMOS sensor to a processor, wherein at least one of the plurality of pulses in the light from the light source is suppressed during one or both of the pixel readout portion of the readout sequence and the blanking portion of the readout sequence such that an aggregate amount of illumination which is the sum of the amplitude and the duration of all nonsuppressed pulses for a first blanking period is equal to the aggregate amount of illumination level of in a successive blanking period; creating a sensor readout frame for each readout sequence of the CMOS sensor; and wherein creating the sensor readout frame comprises superimposing a plurality of pulses of light to obtain a resultant image.
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14. A method for providing an image comprising:
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determining a frequency of a patient'"'"'s vocal cords during a videostroboscopy procedure; strobing light from a light source at a frequency that substantially matches the patient'"'"'s vocal cord frequency; receiving a plurality of pulses of light from the light source as strobing input by a CMOS sensor during a pixel readout portion of a readout sequence and during a blanking portion of a readout sequence; reading out information obtained from the CMOS sensor to a processor, wherein at least one of the plurality of pulses of light from the light source is suppressed during one or both of the pixel readout portion of the read out sequence and the blanking portion of the readout sequence such that an aggregate amount of illumination which is the sum of the amplitude and the duration of all nonsuppressed pulses for a first blanking period is equal to the aggregate amount of illumination level of in a successive blanking period; creating a sensor readout frame for each readout sequence of the CMOS sensor, wherein a light pulse from the light source occurs during a first readout frame of the CMOS sensor; superimposing sensor readout frames comprising the first readout frame and a subsequent readout frame to obtain a resultant image; tracking a light deficiency for each row of the CMOS sensor in each superimposed sensor readout frame; and applying a digital gain to normalize the resultant image into an artifact-free image.
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Specification