Research On Information Recovery And Character Recognition Of Computer Video Electromagnetic Leakage

When computer equipment transmits information,it also generates electromagnetic leakage.Intercepting the electromagnetic signals leaked from computer equipment and recovering the information transmitted by the equipment is of great significance in the field of information security.The computer display system contains a wealth of user information.This paper focuses on the interception of video radiation signals,recovery of image information,and text recognition of images.The problems of large volume of information interception equipment and low automation of video information recovery technology were improved.The work and innovations done in this paper are summarized as follows:1.This paper summarizes the principles and coupling approaches of electromagnetic leakage,and compares and discusses the main sources of information leakage in computer display systems.After analyzing the composition and spectral characteristics of video signals,the principles of intercepting computer video radiation signals and the conditions required to recover image information are summarized.2.This paper designs a computer video signal electromagnetic leakage monitoring system.The monitoring system can intercept the video radiation signal and restore the video image of the LCD monitor in real time.The hardware platform is based on small software radios to intercept video radiated signals.The software platform is based on technologies such as auto-correlation and multi-frame average noise reduction for data sample processing and information recovery.By improving the hardware solution and video information recovery technology,this system has the advantages of small size,high degree of automation,and real-time performance.3.A method of counting the average values of pixels in the horizontal and vertical directions is designed for synchronous detection,which can identify the image display area and the blanking area.This paper also designs an automatic image tilt correction algorithm.After experimental verification,each frame can be automatically aligned.4.This paper has designed a set of computer text recognition process and method for electromagnetic leakage information.In order to perform character recognition research on the recovered image,image pre-processing is performed first to remove noise and image blanking areas and enhance the outline of the text.Then use the method based on connected areas to locate and segment the text area,and finally make a training set and train it,which improves the accuracy of text recognition.Through the experimental verification on the test set,the accuracy of text recognition for numbers is as high as 96.4%.