Measurements > Local Measurements

Generates and visualizes measurements from individual pixels in the image.

1. Measurement

Select the following types of measurements you would like to see visualized in the image.

  • Area Fraction: Measures the local area fraction of selected features at each pixel in the image
  • Thickness: Measures the local thickness along features by measuring the diameter of the largest circle that can fit inside a feature with the center of the circle at each point along the feature’s skeleton
  • Orientation: Measures the local orientation of features at each pixel in the image from – 90 degrees to + 90 degrees
  • Anisotropy: Measures the amount of local directionality of features at each pixel in the image, with 0 being completely random in direction and 1 being highly directional
  • Intensity Mean: Requires that a grayscale Companion Image be set earlier in the Recipe. Measures the local average grayscale intensity at each pixel within the features. The measured grayscale intensities come from the latest set Companion Image.
  • Intensity StdDev: Requires that a grayscale Companion Image be set earlier in the Recipe. Measures the local standard deviation in grayscale intensity at each pixel within the features. The measured grayscale intensities come from the latest set Companion Image.
  • Nearest Distance: Requires that a B/W Companion Image be set earlier in the Recipe. Measures the the distance between each feature’s pixel and the nearest feature pixel from the latest set Companion Image.

2. Parameters

Parameters vary depending on measurements.

  • Window Size: For Area Fraction, Orientation, Anisotropy, Intensity Mean, and Intensity StdDev the window size can be adjusted. The window size determines the number of pixels that will be used to calculate a measurement value for each pixel.
  • Method: Sets the method for window translation across the image. Options are Sliding (Slide) or Blocks (Step).
  • Trim Thresh: For Thickness the trim threshold can be adjusted. Local thickness measurements are made at each pixel along the features’ skeleton. The trim threshold determines the minimum length (in pixels) that all skeleton branches must be. Any branches below this length will be removed. This can be useful for removing small branches in the corners of features which do not represent pixels that one wishes to measure for thickness.
  • Method: For Thickness the method can be set. Local thickness measurements are made at each pixel along the features’ skeleton. The algorithm which calculates this skeleton can be selected here.
    - Advanced: Uses morphological thinning to produce skeletons typically with fewer branches. Often leads to more accurate thickness measurements.
    - Classic: Uses traditional skeletonization to produce skeletons typically with more branches. However, in the case of very simple shapes, this method can produce slightly longer skeletons such that more desired pixels are measured than with the advanced method.

3. Generate

  • Generate measurements with the current settings and print them in the table on the left

4. Select a Cell

  • Select any cell in the measurement column to view the local measurements on the right.

5. Save Image

  • Save image anywhere on your computer.

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