Research On New Techniques For Examination Of Added Printing

At present,office automation has been fully popularized,office printing equipment has been applied in various fields,but with the wide use of printed documents,a variety of problems have followed,the addition of documents,tampering phenomenon is becoming more and more common,the means of adding changes tend to be complex and diverse.With the use of text editing software,it is difficult to check the files,and even the traces are difficult to be found.In this situation,the technical method of adding print inspection is higher.The traditional test methods are mainly based on microscopic examination and video spectrometry,or the microscopic morphology and distribution characteristics of ink,or the composition analysis by infrared and Raman spectroscopy,so as to achieve the purpose of distinguishing the addition printing.In this paper,a new test method is used to explore the features from different angles,including three-dimensional features of printed text,gray scale features and electrostatic features.This paper is divided into five chapters to outline the above methods,experiments,comments and so on.The first chapter mainly describes the features of adding printed documents and their conventional test methods.The most common features of adding printing are the spacing of words and the morphological features of ink marks,which are relatively easy to find and can be found by practical tests.Correspondingly,for these features,people find test methods for discovery and identification,including observation and measurement,microscopic observation with the help of instruments or composition analysis.The second chapter will focus on one of the new inspection techniques,that is,quantitative analysis,data statistics,discovery and summary of the ink layer characteristics of India with the help of instruments.In the study of the characteristics of ink layer,there are many factors to be excluded and problems to be solved.These contents will also be explained and solved one by one by principle explanation and experimental proof.Finally,the second chapter will show the two sub-content of ink layer characteristics comprehensively,and prove the feasibility and effectiveness of the test method.The third chapter starts from the brief overview of the gray value,emphatically explains the gray value measurement method,extracts the statistical data,determines the printer corresponding gray scale range interval,and through the data contrast way proves to add the printing fact,thus explains the gray value detection this method feasible,the reliability.The fourth chapter focuses on the principle of electrostatic appearance and the performance of experimental results predicted according to this principle,and analyzes and reflects on the actual experimental results.The fifth chapter will analyze the advantages and disadvantages of each new test method compared with the traditional test method in the form of a special chapter,and summarize the experimental results and findings.In any case,the study of adding printing can greatly promote the identification of document identity and tampering with forged documents in forensic practice.This paper studies the addition of printed files through the above new technical methods,which can provide another perspective to discover and observe the characteristics of the files,broaden the inspection ideas,and improve the technical methods of adding printed files.