Research On Invisible Information For Visible Imaging Light Communications

In recent years,the researches on visible light communication have become more and more hot,and visible light imaging communication is one of visible light communication.With the continuous development of LCD and imaging devices,the application of visible light imaging communication is becoming more and more widely.Visible light imaging communication is divided into display imaging communication and implicit imaging communication,the main application of imaging communication is two-dimensional code,and implicit imaging communication can increase the user’s experience,the main application of implicit imaging communication is information push and implicit advertising.Based on the analysis of imaging communication model,transmission characteristics,perspective distortion and modulation or detection algorithm of implicit imaging communication,the implicit imaging communication algorithm of frequency domain,luminance and RGB component are studied,and the an implicit imaging communication system is designed based on RGB algorithm.the main works of this paper are as follows:Firstly,the system model of implicit imaging communication is established,and the influence of angle and distance on implicit imaging communication are analyzed.the imaging channel the visual characteristics,implicit imaging communication and two image distortion caused by the transmission characteristics are studied,implicit image communication modulation and detection technology are analyzed from two aspects of frequency domain and space-time domain.the DCT algorithm,DWT algorithm,RGB component algorithm and brightness component algorithm are analyzed,finally,the detection of space-time synchronization are studied.Secondly,Laplasse Pyramid decomposition implicit imaging communication algorithm is proposed based on the implicit information modulation decomposition using the principle of Gauss Pyramid and Laplasse Pyramid decomposition,and the Sobel edge detection algorithm of Hof detection,line detection and distortion correction are analyzed,At the same time,the video of different modulation intensity coefficients was tested by the way that the tester watched the video,the BER of DCT algorithm,DWT algorithm and frequency domain algorithm under different modulation intensity coefficients are simulated.The simulation results show that the optimum modulation intensity factor is 0.05,and the bit error rate is reduced by 10%.Thirdly,An implicit image communication algorithm based on brightness and RGB components is proposed,and the brightness modulation intensity coefficient and the RGB component of the image are studied.At the same time,the video of different modulation intensity coefficients was tested by the way that the tester watched the video,the BER of RGB component algorithm,luminance algorithm and frequency domain algorithm under different modulation intensity coefficients are simulated.Simulation results show that the error rate of the luminance algorithm and the RGB component algorithm is reduced by 5% compared with the frequency domain algorithm.Finally,the system of visible light imaging implicit communication is designed and implemented,the implicit effect and transmission performance of the system are analyzed,the results show that the transmission of implicit information can realized in the range of 0.7 to 2.4 meters and the angle is not greater than 15 degrees range.