Dissertation > Excellent graduate degree dissertation topics show

The THz images streaks noise cancellation method

Author: ZouYuanYuan
Tutor: GeQingPing
School: Capital Normal University
Course: Communication and Information System
Keywords: THz images stripe noise Fourier transform amplitude spectrum frequency domain threshold denoise filter
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 157
Quote: 3
Read: Download Dissertation

Abstract


The terahertz(THz) radiation occupies a large portion of the electromagnetic spectrum between the microwave and infrared bands.Since it possesses many attractively characteristic properties,THz imaging and sensing technologies can provide information not available through conventional methods such as microwave and X-ray techniques.THz waves contain rich information involved in molecular vibration and rotation,and have sub-picoseconds pulse width,low photon energy and high space-time coherence.Because its’ special characteristics,THz imaging technology has huge application potentiality in biological medicine,security inspection,testing of aerospace materials aspects and so on.In the research using CW THz imaging technology to deboned in space shuttle insulating foam,the noise severely affects the future image processing.The research content is the reduction of stripe noises in THz images.The basic objective is to effectively remove stripe noises while preserving the original image details as much as possible so that the original informations could be obtained better.In this paper,we analysis the generation of the stripe noise in THz images.According analysis the characteristics for stripes,analogy noise generation,we propose two new methods for stripes denoise in frequency area,and through experiments to compare algorithm performance and evaluation.The research contents of the paper are as follows:1.Using a threshold to determine the noise’s frequency points,using frequency domain filter principle to combinated threshold segmentation and frequency domain filtering,so that filtering process more intuitive,the image.2.Based on the amplitude spectrum of the image of the projection automatically determines frequency noise algorithm,than using the traditional low-pass,band stop,notch filter for image processing,statistical methods and filtering idea of combining this ways to achieve relatively simple,and better able to eliminate stripes noise.The experimental results show that both methods can effectively eliminate the stripe noise of THz images,but also can better maintain the original image information.

Related Dissertations

  1. Research on Electromagnetic Acoustic Transducer Detection System Based on FPGA,TH878.2
  2. Algorithm Research on SINS/GPS Integrated Navigation Syste,V249.328
  3. Satellite Attitude Determination Based on Gyro and Star Sensor,V448.2
  4. Research on Transfer Alignment of the Missile Onboard the Aircraft,V249.322
  5. Research on Cooperative Orbit Determination in Satellite Network Based on Multi-Agent System Theory,V474
  6. Research on Data Acquisition and Processing Methods for Weapon Evaluation System,TJ06
  7. The Study of Control Algorithm for Automotive Power Window Based on Lin Bus,U463.6
  8. Study of Three-Phase AC Chopper Surge and Its Harmonic Elimination Technology,TM423
  9. Design of Servo Control System with Linear Motor Based on Digital Filter Technology,TM359.4
  10. Resrarch on Multisignatures and Multisigncryptions from Identity-based,TN918.1
  11. Research on Spread Spectrum Code Acquisition of Double Threshold Based on Sliding Correlator,TN914.42
  12. Performance Analysis of Anti-Multipath Capability in DSSS System and Study on the Compensation Methods,TN914.42
  13. Analysis of Spread Spectrum Signals Based on FRFT,TN911.6
  14. Maneuver Detection and Tracking with the Radar Rate Measurement,TN953
  15. The Maneuvering Target Tracking Research Based on VRPF,TN957.52
  16. Research on Improvement of DSSS Receiver Based on Phase Domain,TN914.42
  17. Design and Processing of Hybrid Modulated HF Radar Waveform,TN958.93
  18. Research of High Speed Image Pre-processing System Based on FPGA,TP391.41
  19. Research on Methods of Medical Ultrasound Image Denoising,TP391.41
  20. The Research of 3D Human Motion Capture Based on Reference Points,TP391.41
  21. Research on Visual Detection and Tracking of Mobile Robots,TP242.62

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
© 2012 www.DissertationTopic.Net  Mobile