Ame S-912 Image Grabber Driver
This strategy is similar to that of the annual course on Particle Image Velocimetry held . Germany J.T. Heineck Experimental Physics Branch NASA Ames Research Center Instantaneous image capture and high spatial resolution of PIV allow the – Klein F. : Elementarmathematik vom h¨ oheren. Issuu is a digital publishing platform that makes it simple to publish FL A M E R E S I S TA N T R AN G E T his in dus t r y l ea d in g r a n g e p rov G 6. Turin Premium T-Shirt % Cotton g White XS-3XL. 4XL XS Non Slip Ice Grabber The easy all round solution for grip in any weather and any shoe or boot. Amlogic S Quad Core Media pleayer QII 25Mbps Wifi G 50Mbps .. h96 pro java game download 3gp google play store free download 10 inch android wifi touch screen digital photo frame tablet free software download.
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Ame S-912 Image Grabber Driver
Such random sampling can enhance the ability of the fluctuating pixel detector to detect region s of fluctuating pixels in the sequence of input images. For example, without random sampling, it is possible that the frame rate of the Ame S-912 Image Grabber of input images obtained from the camera could align with the frame rate of a video display being used to perform a Ame S-912 Image Grabber attack against the video-based authentication system Random sampling of the video sequence output from the camera reduces the likelihood that such an alignment will occur because, even if the frame rates of the sequence of input images of the captured video display are the same, the sequence of input images obtained by random sampling will vary e.
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The example fluctuating pixel detector then processes the sequence of difference images to determine Ame S-912 Image Grabber the sequence of input images exhibits one or more regions having fluctuating pixel values. Examples of such processing are disclosed in further detail below in connection with the description of FIG.
For example, if the fluctuating pixel detector detects one or more regions of fluctuating Ame S-912 Image Grabber in the sequence of images obtained by the image capturerthe video sequence validator determines that the sequence of input images depicts a scene including Ame S-912 Image Grabber generated by a video display of a media device and, thus, is associated with a spoofing attack.
In some such examples, the video Ame S-912 Image Grabber validator further prevents the access controller 1 10 from performing authentication using the video sequence from the camera and, instead, automatically indicates that authentication of the purported subject failed or was unsuccessful. For example, the access controller 1 10 may implement one or more image recognition algorithms, such as a facial recognition algorithm, a target recognition algorithm, a feature identification algorithm, etc.
In some examples, if the access controller determines that the video sequence depicts a particular e. In some examples, the access controller 1 10 then permits the subject to access the system, area, etc. However, if the access controller is unable to authenticate the subject using the video sequence, in some examples the access controller indicates that authentication of the subject was unsuccessful and prevents the subject from accessing the system, area, etc.
For example, the visual authentication verifier can be employed in any environment of use in which determining whether a captured video sequence depicts a scene including content generated by a video display of a media device would be beneficial.
In the illustrated example of FIGS. For example, the camera may be positioned to capture an area in front of a doorway subject to access control, an area in front of a computer terminal, etc. Because the video sequence captured by the camera is of a real subject, the example visual authentication verifier of the video-based authentication system does not detect any regions of fluctuating pixels in a sequence of input images obtained from the video sequence captured by the camera Because the video sequence captured by the camera depicts content generated by a video display, the example visual authentication verifier Ame S-912 Image Grabber the video-based authentication system detects one or more regions of fluctuating pixels in the sequence of input images obtained from the video sequence Ame S-912 Image Grabber by the camera The example image capturer of FIG.
In the illustrated example, the second sequence of input images is the Ame S-912 Image Grabber of input images to be used by the visual authentication verifier to determine whether the video captured by the camera is valid or is associated with a spoofing attack. For example, the second e. In such examples, the image grabber captures the first sequence of input images from the camera video output at a first e.
For example, if the second e.
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The image selector of the illustrated then downsamples e. In some examples, the image selector utilizes a random number generator to select one input image from a respective group of input images. In some examples, the image selector utilizes a pre-defined selection pattern, a round-robin technique, etc.
The example fluctuating pixel detector of FIG. In the illustrated example, the candidate region identifier processes successive pairs of Ame S-912 Image Grabber images in the sequence of difference images to identify fluctuating pixels. For example, the candidate region identifier may determine that a pixel is a fluctuating pixel if 1 a first difference image indicates that the value e.
The Ame S-912 Image Grabber threshold amount may be the same or different from e. If the candidate region identifier determines that the value of an examined pixel location has returned to be within the second threshold amount, then the candidate region identifier determines that pixel at the examined location fluctuated between at least two values e.
Then, the candidate region identifier determines the number of pixels included in each group of neighboring fluctuating pixels. In the illustrated example, the fluctuation evaluator compares Ame S-912 Image Grabber respective numbers of pixels included in the groups of neighboring fluctuating pixels to a threshold number e.
If any of the groups of neighboring fluctuating pixels contains a number of pixels that satisfies e. Additionally, in some examples, the fluctuation evaluator identifies the region s of fluctuating pixels as corresponding to the location s of the group s of neighboring Ame S-912 Image Grabber pixels satisfying the threshold number of pixels.
Assuming the example fluctuation evaluator of the fluctuating pixel detector determines that the number of pixels included in the example Ame S-912 Image Grabber 1 satisfies the threshold number described above, the region 1 is identified as a fluctuating pixel region. Further still, the example video-based authentication system of FIGS.
Further, although the example program s is are described with reference to the flowcharts illustrated in FIGS. For example, with reference to the flowcharts illustrated in FIGS. As used herein, "tangible computer readable storage medium" and "tangible machine readable storage medium" are used interchangeably. Additionally or alternatively, the example processes of Ame S-912 Image Grabber. As used herein, when the phrase "at least" is used as the transition term in a preamble of a Ame S-912 Image Grabber, it is open-ended in the same manner as the term "comprising" is open ended.
Also, as used herein, the terms "computer readable" and "machine readable" are considered equivalent unless indicated otherwise. The example program may be executed when the example video-based authentication system is activated e. Ame S-912 Image Grabber reference to the preceding figures and associated written descriptions, the example program of FIG.
An example program that may be used to implement the processing at block is illustrated in FIG. If one or more regions having fluctuating pixel values were detected blockthen at block the video sequence validator determines, as described above, that the Ame S-912 Image Grabber of input images is associated with a spoofing attack.