Afis thesis

Die Zahl gibt die Anzahl der vertikalen Pixel an. Damit ist gemeint, dass das Bild im Interlace-Verfahren aufgebaut wird. Es wird also abwechselnd je ein halbes Bild auf dem Bildschirm angezeigt. Damit ist gemeint, dass immer das komplette Bild auf einmal dargestellt wird.

Afis thesis

Afis thesis

Biometric functionality[ edit ] Many different aspects of human physiology, chemistry or behavior can be used for biometric authentication. The selection of a particular biometric for use in a specific application involves a weighting of several factors.

Universality means that every person using a system should possess the trait. Uniqueness means the trait should be sufficiently different for individuals in the relevant population such that they can be distinguished from one another.

Permanence relates to the manner in which a trait varies over time. Measurability collectability relates to the ease of acquisition or measurement of the trait. In addition, acquired data should be in a form that permits subsequent processing and extraction of the relevant feature sets.

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Performance relates to the accuracy, speed, and robustness of technology used see performance section for more details. Acceptability relates to how well individuals in the relevant population accept the technology such that they are willing to have their biometric trait captured Afis thesis assessed.

Circumvention relates to the ease with which a trait might be imitated using an artifact or substitute. Proper biometric use Afis thesis very application dependent.

Certain biometrics will be better than others based on the required levels of convenience and security. Three steps are involved in the verification of a person.

In the second step, some samples are matched with reference models to generate the genuine and impostor scores and calculate the threshold. Third step is the testing step.

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This process may use a smart cardusername or ID number e. PIN to indicate which template should be used for comparison. The system will succeed in identifying the individual if the comparison of the biometric sample to a template in the database falls within a previously set threshold.

The first time an individual uses a biometric system is called enrollment. During the enrollment, biometric information from an individual is captured and stored. In subsequent uses, biometric information is detected and compared with the information stored at the time of enrollment. Note that it is crucial that storage and retrieval of such systems themselves be secure if the biometric system is to be robust.

The first block sensor is the interface between the real world and the system; it has to acquire all the necessary data. Most of the times it is an image acquisition system, but it can change according to the characteristics desired.

The second block performs all the necessary pre-processing: In the third block necessary features are extracted. This step is an important step as the correct features need to be extracted in the optimal way.

A vector of numbers or an image with particular properties is used to create a template. A template is a synthesis of the relevant characteristics extracted from the source. Elements of the biometric measurement that are not used in the comparison algorithm are discarded in the template to reduce the filesize and to protect the identity of the enrollee[ citation needed ].

During the enrollment phase, the template is simply stored somewhere on a card or within a database or both. During the matching phase, the obtained template is passed to a matcher that compares it with other existing templates, estimating the distance between them using any algorithm e.

The matching program will analyze the template with the input. This will then be output for any specified use or purpose e. Selection of biometrics in any practical application depending upon the characteristic measurements and user requirements.Crime Scene Training A blog to teach the fundamentals of Crime Scene Investigation, and to encourage input, feedback and involvement from site visitors.

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Afis thesis

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Biometrics - Wikipedia