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Binary and General Thresholding Techniques in Image Processing

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Learn about binary and general thresholding in image processing, including implementation using ITK. Explore different thresholding modes and their effects on images.

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Binary and General Thresholding Techniques in Image Processing

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  1. Thresholding Filter 指導老師:張 顧 耀 報 告 人:張 偉 政 學 號:E9506006

  2. Outline • What is Threshold. • Binary Thresholding. • General Thresholding. • Program Perform. • Reference.

  3. Thresholding • Change or Identify pixel values. • Base on specifying one or more values. • This perform using ITK.

  4. Binary Thresholding Filter • Binary • Transform an image into a binary image • itk::ImageFileReader • CH7，P263

  5. Binary Thresholding Filter • SetOutsideValue( outsideValue ); • SetInsideValue( insideValue ); • SetLowerThreshold( lowerThreshold ); • SetUpperThreshold( upperThreshold );

  6. Binary Thresholding Filter • Effect of the BinaryThresholdImageFilter

  7. General Thresholding Filter • Three different ways. • Threshold-below mode. • Threshold-above mode. • Threshold-outside mode.

  8. General Thresholding Filter • Threshold-below mode. • SetOutsideValue(outsideValue ); • ThresholdBelow(Below Value);

  9. General Thresholding Filter • Threshold-above mode. • SetOutsideValue(outsideValue ); • ThresholdAbove(Above Value );

  10. General Thresholding Filter • Threshold-outside mode. • SetOutsideValue(outsideValue ); • ThresholdOutside( Lower,Upper );

  11. Program Perform • Binary Thresholding • SetOutsideValue(0); • SetInsideValue(4000); • SetLowerThreshold(650); • SetUpperThreshold(1600 ); • SetOutsideValue(0); • SetInsideValue(4000); • SetLowerThreshold(400); • SetUpperThreshold(2600);

  12. Program Perform • General Thresholding • Threshold-below mode. • SetOutsideValue(0); • ThresholdBelow(800); • SetOutsideValue(0); • ThresholdBelow(2000);

  13. Program Perform • General Thresholding • Threshold-above mode. • SetOutsideValue(0); • ThresholdAbove(1200); • SetOutsideValue(0); • ThresholdAbove(2600);

  14. Program Perform • General Thresholding • Threshold-outside mode. • SetOutsideValue(0); • ThresholdOutside(880,2600); • SetOutsideValue(0); • ThresholdOutside(1880,2600);

  15. Reference • The ITK Software Guide Second Edition Updated for ITK version 2.4 • http://www.csie.dyu.edu.tw/~canseco/

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