Color separation in forensic image processing

In forensic image processing, it is often important to be able to separate a feature from an interfering background or foreground, or to demonstrate colors within an image to be different from each other. In this study, a color deconvolution algorithm that could accomplish this task is described, and it is applied to color separation problems in document and fingerprint examination. Subtle color differences (sometimes invisible to the naked eye) are found to be sufficient, which is demonstrated successfully for several cases where color differences were shown to exist, or where colors were removed from the foreground or background. The software is available for free in the form of an Adobe Photoshop-compatible plug-in.     

What’s So Funny About That?

This paper argues that it is impossible to know why we laugh. There are a number of theories that attempt to explain why we laugh but they all have limitations. It is possible, however, to know what makes us laugh and 45 techniques that inform humor are listed and used to analyze a number of humorous texts. These techniques can also be used to study the humor of different nations to determine which they favor and which they neglect, thus offering insights into national character.     

Extending the Confusion About Bayes

In R v T [2010] EWCA Crim 2439, [2011] 1 Cr App Rep 85, the Court of Appeal indicated that ‘mathematical formulae’, such as likelihood ratios, should not be used by forensic scientists to analyse data where firm statistical evidence did not exist. Unfortunately, when considering the forensic scientist's evidence, the judgment consistently commits a basic logical error, the ‘transposition of the conditional’ which indicates that the Bayesian argument has not been understood and extends the confusion surrounding it. The judgment also fails to distinguish between the validity of the relationships in a formula and the precision of the data. We explain why the Bayesian method is the correct logical method for analysing forensic scientific evidence, how it works and why ‘mathematical formulae’ can be useful even where firm statistical data is lacking.     

Social structure of the Jewish quarter in Vienna during the liberal era (1850–1900)

The article examines the nature of residential and coresidential patterns in the second half of the 19th century in a district of Vienna known as Leopoldstadt, which had a large Jewish population. Analysis of a database from this district, paying attention to occupation and class variables, suggests that the Jewish population therein was more mixed than traditional interpretations suggest, and that the concentration of Jews there can plausibly be explained mainly by reference to residential choices made by Jews to live near an economic infrastructure that catered to their religious and cultural needs. The patterns identified in the data suggest further that in interpreting the residential patterns of the city it is necessary to conceptualize the problem as one of interaction between religion, economics, and residential choice.     

Semiotics and Society

This essay introduces some of the basic concepts that can be used in applied semiotic analysis and discusses the work of some prominent semioticians, such as Ferdinande de Saussure, Charles Sander Peirce, Umberto Eco, and Roland Barthes. Barthes’ book Mythologies is identified as a seminal text in applied semiotic analysis. Marshall McLuhan’s book The Mechanical Bride is discussed as being semiotic in nature, though he doesn’t use the term. The utility of semiotics utility in studying teeth, facial expression and other aspects of people watching and communication is also dealt with.     

The Interplay of Adolescents’ Aggression and Victimization with Friendship and Antipathy Networks within an Educational Prosocial Intervention

Journal of Youth and Adolescence - How the interplay between peer relationships and behaviors unfolds and how this differs between classrooms is an understudied topic. This study examined whether...     

Firearm examination: Examiner judgments and computer‐based comparisons

Forensic firearm examination provides the court of law with information about the source of fired cartridge cases. We assessed the validity of source decisions of a computer‐based method and of 73 firearm examiners who compared breechface and firing pin impressions of 48 comparison sets. We also compared the computer‐based method's comparison scores with the examiners' degree‐of‐support judgments and assessed the validity of the latter. The true‐positive rate (sensitivity) and true‐negative rate (specificity) of the computer‐based method (for the comparison of both the breechface and firing pin impressions) were 94.4% and at least 91.7%, respectively. For the examiners, the true‐positive rate was at least 95.3% and the true‐negative rate was at least 86.2%. The validity of the source decisions improved when the evaluations of breechface and firing pin impressions were combined and for the examiners also when the perceived difficulty of the comparison decreased. The examiners were reluctant to provide source decisions for "difficult" comparisons even though their source decisions were mostly correct. The correlation between the computer‐based method's comparison scores and the examiners' degree‐of‐support judgments was low for the same‐source comparisons to negligible for the different‐source comparisons. Combining the outcomes of computer‐based methods with the judgments of examiners could increase the validity of firearm examinations. The examiners' numerical degree‐of‐support judgments for their source decisions were not well‐calibrated and showed clear signs of overconfidence. We suggest studying the merits of performance feedback to calibrate these judgments.     

Current issues in state mental health forensic programs

The major current issues facing state and local forensic mental health programs are presented in this paper. Debates over forensic patients' rights and the insanity defense are discussed, together with many administrative problems such as the pros and cons of correctional versus mental health system program control and payment incentives for treatment. The authors cite the differing goals of correctional and mental health systems, i.e., security and treatment, as reasons for difficulties in developing needed collaboration. Guidelines are suggested to address such important issues as mixing civil with criminal patients, developing units for special populations, defining patients who can respond to treatment, and follow-up after discharge.