Systems that operate with biometrics identifies a person with the behavioral and physiological biometric data. The unique characteristics such as face, fingerprint, and palm print and iris remains unchanged throughout the life of a person. The versatility of biometric system depends on the requirement of an application so that it can be used as a verification mode or identification mode. Fingerprint is a pattern of bifurcations, curves and minutiae, which are extracted using inked impression on a paper or sensors. A high quality fingerprint contains 25 to 80 minutiae depending on sensor resolution and finger placement on the sensor. In latent fingerprint matching case, it is very challenging to estimate the orientation field based only on the image due to the blurredness and lacking area of the latent. In this paper, we propose a new fingerprint matching algorithm which is especially designed for matching latent. The proposed algorithm modifies the orientation based minutia to the texture descriptor by adding the ridge frequency information and histogram equalization is also employed in improving the intensity of the latent images. The experimental results are performed on two different latent databases, NIST SD27 latent databases and the proposed algorithm is written in mat lab.
Keywords- latent,minutiae,databases-NISTSD27,orientation field
Introduction
Fingerprints remain unique for every individual and thus it plays a major role in identification of the culprits in forensics. The latent fingerprint matching algorithms proposed includes the image enhancement; feature extraction and matching of the latents.The different characteristics of the images which give a prominent difference bet...
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... latent examiners. Although this classification of latent prints as “good”, “bad”, and “ugly” is subjective, it has been shown that such a classification is correlated with the matching performance. Another indicator of fingerprint quality that affects the matching performance is the number of minutiae in the latent print.
IMPLEMENTATION
Fig: Latent Fingerprint
Fig: Thinned image
Fig: Feature Extraction
Summary
A fingerprint matching algorithm is designed for matching latents to rolled or /plain fingerprints which is based on texture based Hough transform alignment. The performance of the proposed matcher is compared for two different latent databases. The texture based descriptor is used to improve the matching accuracy especially when the overlap between the latents and rolled prints is more.
Next we will discuss the processes used when dealing with latent prints. First I will discuss the analysis of a latent print. So first when a latent print is sent to the lab who conducts the analysis? The forensic analysis is he person that conducts the analysis, or a fingerprint technician or even a police officer. Bu...
Nowadays, DNA is a crucial component of a crime scene investigation, used to both to identify perpetrators from crime scenes and to determine a suspect’s guilt or innocence (Butler, 2005). The method of constructing a distinctive “fingerprint” from an individual’s DNA was first described by Alec Jeffreys in 1985. He discovered regions of repetitions of nucleotides inherent in DNA strands that differed from person to person (now known as variable number of tandem repeats, or VNTRs), and developed a technique to adjust the length variation into a definitive identity marker (Butler, 2005). Since then, DNA fingerprinting has been refined to be an indispensible source of evidence, expanded into multiple methods befitting different types of DNA samples. One of the more controversial practices of DNA forensics is familial DNA searching, which takes partial, rather than exact, matches between crime scene DNA and DNA stored in a public database as possible leads for further examination and information about the suspect. Using familial DNA searching for investigative purposes is a reliable and advantageous method to convict criminals.
The acceptance of fingerprint identification in the judicial system as scientific evidence has become like expert testimony. Advances in image processing have impacted how fingerprints can be lifted without being destroyed, which has led to fingerprint evidence becoming the silent testimony leading to more conventions. In the case of the United States v. Byron C. Mitchell Criminal Action No. 96-00407, fingerprints found in the car were the scientific evidence which identified Mitchell as a participant in an armored car robbery (Appellant Counsel for Appellee, 2003).
Another discrepancy between actual forensics and how it is portrayed in the media is the availability of information in databases. There is only a small percentage of the entire population’s fingerprints or DNA samples stored within databases such as the Integrated Automated Fingerprint Identification System (IAFIS). This makes finding a match between a DNA sample or fingerprint difficult, as a match would only be found if the person’s information was already stored within the database. If there is no match previously stored in a database, the fingerprint or DNA sample could be potentially rendered useless within a trial. Typically, in order to perform an analysis, investigators must already have a suspect in mind and request a DNA or fingerprint sample from him or her. If the suspect does not want to provide one however, the sample collected as evidence may not count as valid. The CSI effect creates an idealized image that all crimes can be solved with a hair or drop of blood, but this is not always the case in real life.
Contextual information also affects the human comparative part of fingerprint analysis, in ways that alter the matching of the same fingerprints, years apart; however, when contextual information is provided, it actually helps 20% of forensic technicians, but that still leaves 80% hindered by contextual information (Dror et al, 2006). Contextual information affects the psychological aspects of perception and problem-solving, in a way that can obscure information that does not support the context, and it can even affect how forensic technician’s view and handle forensic evidence (Bernstein et al, 2013). However, there are some advantages of contextual information, because it can give the forensic division a mental shortcut, saving time and money; however, these shortcuts lead to inaccurate and biased conclusions. This essay has shown that contextual information creates erroneous mistakes and prejudiced results in forensic investigations. A possible way to remove the negative effects of contextual information is to have the forensic technicians, not know the context of the crime so that they do not
By the 19th century, the criminology research scholars have had a keen interest in biometric identification, they hope to combine physical characteristics with criminal tendencies, which resulting in a series of measuring devices, and also collected a large amount of data. Since then, the concept of measuring a person's physical characteristics are finalized, fingerprints also become the identification of international methodological standards for public security agencies. People often debate whether fingerprints have absolutely unique, and also thought that the different countries have the different standard for identifying fingerprints. So far, it is still the most widely methods of public security organs, and the process is also automated.
In U.S. v. Havvard, numerous scientific findings challenged the validity and accuracy of the latent fingerprint matching technique. The technique involves using special procedures to uncover finger print residues that are invisible to the naked eye, and studies find that it can vary significantly in its quality and correctness. The court, nevertheless, referred to latent finger print matching as the “archetype” of reliable expert testimony by asserting that it “[has] been used in ‘adversarial testing for roughly 100 years,’ which offered a greater sense of the reliability of fingerprint comparisons than could the mere publication of an article.” Though many studies point out that finger print collection and examination can be highly inaccurate if done without rigor, fingerprinting methods such as latent print matching have not suffered a sustained challenge in federal court in nearly 100 years. In addition to latent print matching, the National Academy of Sciences, the National Commission on Forensic Science, the President’s Council of Advisors on Science, and Technology and the Texas Forensic Science Commission have found that many well-known and admitted forensic science techniques such as bite-mark analysis, microscopic hair comparison, and arson evidence are questioned by independent
The three different main types of fingerprints are Loops, Arches, and Whorls (Jackson 1). Henry Faulds is known as the Father of Fingerprints and developing fingerprints (Jackson 1). His discovery of fingerprints has made a huge impact not only in his time but, in Modern Crime Scene Investigation (Jackson 1). Without fingerprinting, it would be very difficult to convict criminals of crimes and very hard to try to process information. Crime Scene Investigators make a huge impact in Forensic Science. We need CSI workers, without them people could only imagine what crime would be like not only in our community, but in our
Law enforcement uses several methods to solve all types of crimes. Having a variety of ways to help solve an investigation gives officials an advantage. If one method fails or isn’t helpful, there are several others they can rely on. For instance, if there are no physical witnesses to a crime, the criminal may have left a fingerprint at the crime scene. An individual’s fingerprint is unique, “no two persons have exactly the same arrangement of ridge patterns” (“Fingerprint ID”). Fingerprints of criminals and of civilians are collected and stored. Also, “People who apply for government jobs, jobs that handle confidential information, banking jobs, teaching jobs, law enforcement jobs, and any job that involves security issues can be fingerprinted” (“The First ID”). Fingerprints are processed within hours and minutes through the Integrated Automated Fingerprint ID System. This system was developed in 1991, and made it easier for different law enforcement agencies to store and share fingerprints.
The easiest way to figure out who was at the crime scene is by taking fingerprints. Good impressions such as fingerprints can be the most valuable pieces of evidence in a forensic investigation. Impressions help link a person to a crime scene or crime as well can provide information on any weapon that could've been used at the scene. An educated technician would compare and search fingerprints manually and on AFIS computer system for classification, comparison and identification. "Analyzing evidence is not a quick or simple process.
Biometrics is described as the use of human physical features to verify identity and has been in use since the beginning of recorded history. Only recently, biometrics has been used in today’s high-tech society for the prevention of identity theft. In this paper, we will be understanding biometrics, exploring the history of biometrics, examples of today’s current technology and where biometrics are expected to go in the future.
Principal Component Analysis (PCA) is a multivariate analysis performed in purpose of reducing the dimensionality of a multivariate data set in order to recognize the shape or pattern of that data set. In other words, PCA is a powerful technique for pattern recognition that attempts to explain the variance of a large set of inter-correlated variables. It indicates the association between variables, thus, reducing the dimensionality of the data set. (Helena et al, 2000; Wunderlin et al, 2001; Singh et al, 2004)
...A. Maria, Ruth M. Robin. (2009). Latent prints: a perspective on the state of the science. Forensic Science Communications. 11.4.
Finger print detection is a really good way to find criminals. Finger prints are excellent on finding the exact criminal because no two fingerprints are exactly the same(Source #1, 1982-Galton, sentence 3) . So once you match the fingerprint with one person then thats the criminal or whoever you are looking for. All you have to do is take advantage of the friction ridge patterns
As one of the feature of biometric, signature verification is used to find the authenticity of a person to give the access the most valued and important documents and shelf. Firstly the signature of a person are taken as a reference in database. To generate the database, number of attempts from the same person has been taken, as it would permit minute deviations in signatures that generates due to environmental conditions. Once it is done, then the signatures at other times are every time then verified with the existing database. Because of confidentially of the file/document/transaction giving access is the crucial process that should be monitored with perfection. The same happens with offline signature verification. Computerized process and verification algorithm (thus software) takes fully care of signature under test, generate results that are 100% authentic, and advocates credibility of the concerned person .However, there might raise issue of authenticity even if the same person performs the signature. Or, at times a forge person may duplicate the exact signature. Many research have been done to find the accuracy of result so as to prevent from forgery. Forgery is also divided into different categories depending upon their severity as