Research And Design Of Video Spectral Comparator With Automatic Scanning And Recognition

Document examination is a kind of usual methods for judicial expertise, which identifies smeared handwriting, indented handwriting, fading, alteration, scrape, watermarking, lightness characters, seal stamps in the documents with the optical detection principles, such as infrared absorption, reflection, projection, photometry, ultraviolet fluorescence, monochromatic light excited fluorescence, etc.Together with the economic development, the social legal sense is strengthened gradually. More and more contracts and notes are applied in businesses and property protections. In accordance, there are increasing cases requesting to indentify whether the characters, digitals, writing date or nominal date in the contracts and notes have been added, tampered or forged. The video spectral comparator is becoming the necessary instrument for identification for all judicial bureaus. Recently, along with the innovation of judicial system in China, the independent judicial expertise agencies are taking the responsibility of identification from the police, the procuratorate, the court and other government departments. Most of these judicial expertise agencies are not equipped with advanced and sufficient hardware and software, especially short of the instruments for identification. Consequently, it is the most urgent and important issue for those agencies to supplement and perfect the relative instruments.This article is devoted into developing a low-cost, high-automatic document examination system of the capability to fulfill the request for identification. There are six chapters to explain the research for the document examination instrument.Chapter One introduces the development in document examination research, expatiates upon the instrumental analytical methods and the domestic and foreign current situation of document examination instrument.Chapter Two propounds the general design project of document examination instrument, and points out the innovation of this article.Chapter Three, Chapter Four and Chapter Five clarify separately the design of the monochromatic illumination system, the receiving system and the image display and processing system, and fully prove the design project by concrete experiments.Chapter Six gives the conclusion and expectation of this article.