Airis N754 VGA Driver
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Airis N754 VGA Driver
There are a number of problems arising from this extended illumination time. Firstly, the drive current of the near IR illuminator, and thus Airis N754 VGA peak illumination falls with pulse time. For instance if the frame readout time for a WOI is 2 milliseconds msthen the peak drive current for the diode Airis N754 VGA about 2.
Secondly, eye safety standard requirements dictate total power incident in the eye over a period of time, so the extended exposure time necessitates a shorter exposure in order to meet those standards. Short pulses can be considerably brighter than long pulses while maintaining eye safety.
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Although in general the near IR illumination used for iris imaging contemplated in this disclosure is well within the eye safety envelope, maintaining a large eye safety margin is good Airis N754 VGA for a device that may be used on a regular basis. Thirdly, more energy will be used in a longer exposure pulse, which compromises the battery life of the mobile computing device.
Readout time for a progressive scan detector can be significantly reduced by providing Airis N754 VGA parallel readout channels.
As many as all lines in the imager could have its own pair of readout amplifiers one per color for the Bayer filter for each row. This would allow a pixel Airis N754 VGA plus 50 pixel over-scan to be read out in about 2.
Intermediate solutions could achieve smaller speedups by adding less readout amplifiers, with each readout amplifier handling either an interleaved sets Airis N754 VGA lines, or a dedicated block of lines. Interleaved lines would be Airis N754 VGA useful for speeding up WOI reads than dedicated blocks because it is more likely that all the added signal chains could be used independently of the size and position of the WOI.
One disadvantage of adding additional readout amplifiers is that analog amplifiers and analog to digital conversion ADC components tend to be quite power hungry, potentially leading to significant heat and battery lifetime issues.
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One way to address this issue would be to enable signals to be routed to a single set of Airis N754 VGA chains for regular use, powering on, and rerouting signals to the additional signal chains only when a rapid readout is required. Additional signal chains could also be associated with on-chip binning controls, such that a single set is used when the detector is binned down to low resolution mode, and additional sets of signal chains come on line as resolution is increased. Global Shutter Detectors A global shutter detector may be used in place of a rolling shutter detector.
In a global shutter detector, all pixels in the imager begin and end integration at the same time, however this feature requires at least 1 extra transistor to be added to each pixel, which is difficult to achieve with the very small pixels used Airis N754 VGA the detectors used in many mobile computing devices. Generally, this requires a slightly larger pixel pitch. However, if a detector supporting a global shutter feature is used, it would facilitate combined Airis N754 VGA and portrait imaging.
This is because it would allow Airis N754 VGA more accurate synchronization of near IR illumination and the image exposure, as the entire exposure could be captured at once. As a result, the near IR illuminator could be driven at higher power for less time.
The higher power would in turn allow for a higher SNR in the subtracted iris image. Charge Counter Pixel Design Many modern detectors Airis N754 VGA photoelectron charge on a pixel for a set amount of time, and then transfers that charge to a readout amplifier to compute the signal.
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However, in one implementation the detector of the imaging system may be designed to include a very small full well by causing the output transistor gate on the pixel to have extremely low capacitance. This allows for a very high transcapacitance gain and therefore an extremely low read noise, in some cases less than the voltage signal of a single photoelectron. This Airis N754 VGA of detector does not include a traditional signal chain or an ADC.
If the detector Airis N754 VGA this structure, each pixel can be coupled to a comparator that is designed to switch after a given Airis N754 VGA of photoelectrons have been detected. When the integrated photo-current charge in a pixel has reached a predetermined level the comparator flips. When the comparator flips, it sends a pulse that increments Airis N754 VGA counter that maintains an increment total for each pixel, and also resets the pixel for a new integration cycle.
In this way the dynamic range of detector is set only by the size of the counter.
The benefit of this arrangement is that the image can be non-destructively read at any time simply by copying the content of the counter. In this way the detector can simulate a global shutter, Airis N754 VGA isolating the background image from the near IR image, while Airis N754 VGA the duration of the flash.
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A detector with this design allows for easy synchronization between effective image integration periods with periods where the near IR illuminator is turned on and off. A further advantage of this design Airis N754 VGA that it allows for extremely high dynamic range, limited only by the maximum counter rate.
This would allow for imaging of the IR glint without loss of linearity, even though this glint would be highly saturated in a traditional detector. An unsaturated glint image allows for extremely precise image re-centering, and would provide Airis N754 VGA extremely high SNR point spread image which could be used to de-convolve the iris image to achieve even higher image quality than could be achieved with a traditional detector. The brightness of the glint can also be used to distinguish real eyes from photographs and from glass eyes.
In traditional double correlated sampling, a pixel value is Airis N754 VGA after reset, then after the integration period is over, and the two values subtracted to estimate the pixel photocurrent. The double correlation process may be carried Airis N754 VGA digitally or in analog depending on the architecture of the detector. For iris imaging, double correlated sampling can be modified by reading the pixel after reset, then once again after an integration time during which the pixel is not illuminated by the near IR illuminator, then once more after the near IR illuminator has been flashed on.