Assessment of Yarn Diameter and Fabric Pore Size using Image Analysis Method

Objective: The objective of this experiment is to determine the yarn diameter and fabric pore size of a fabric sample using image analysis software.


  • Fabric sample
  • Microscope or camera with a magnification lens
  • Image analysis software (such as ImageJ or Photoshop)
  • Ruler or calibration slide
  • Computer


  1. Sample Preparation: a. Select a representative sample of the fabric to be analyzed. The sample should be free from wrinkles, folds, and other distortions that could affect the accuracy of the measurement. b. Cut a small section of the fabric sample, approximately 5 x 5 cm in size. c. Mount the fabric sample on a microscope slide or other flat surface, ensuring that it is taut and free from wrinkles.
  2. Image Capture: a. Set up the microscope or camera with the magnification lens to capture an image of the fabric sample. b. Ensure that the lighting is appropriate and that the fabric sample is in focus. c. Capture the image and save it onto the computer.
  3. Calibration: a. Calibrate the image analysis software using a ruler or calibration slide. b. Measure the distance between two known points on the ruler or calibration slide. c. Enter the measured distance into the software to calibrate the image.
  4. Analysis: a. Open the image of the fabric sample in the image analysis software. b. Using the software’s measurement tool, measure the diameter of several yarns in the image. c. Take multiple measurements to ensure accuracy. d. Record the average diameter of the yarns. e. Using the software’s measurement tool, measure the pore size of the fabric by measuring the distance between two adjacent yarns. f. Take multiple measurements to ensure accuracy. g. Record the average pore size of the fabric.
  5. Data Analysis: a. Calculate the average yarn diameter and fabric pore size from the recorded measurements. b. Calculate the standard deviation of the measurements to determine the precision of the measurement. c. Compare the results to the specifications or standards for the fabric.
  6. Conclusion: a. Summarize the results and compare them to the objectives of the experiment. b. Discuss any sources of error or limitations of the method used. c. Suggest improvements to the method or potential future experiments to further investigate the fabric properties.

Safety Considerations:

  • Use caution when handling sharp objects such as scissors or microscopes.
  • Avoid touching the fabric sample with bare hands to prevent contamination or damage.
  • Follow any additional safety guidelines provided by the equipment manufacturer.