NearHistogramPeakVoxels¶

MacroModule¶

author	`Volker Dicken`
package	`FMEwork/ReleaseMeVis`
definition	NearHistogramPeakVoxels.def

Purpose¶

IntervalThreshold segmentation based on closeness to histogram peak position.

Usage¶

Connect an image and a related histogram to the two inputs. Specify drop levels from peak to define boundary if the interval thresholding performing the segmentation.

Details¶

The modules simply performes an interval thresholding using the gray values were the histogram first drops below the stated percentage of the max histogram bin value when moving up / down from the max. bin position.

Interaction¶

Connect an input image and a histogram of the relevant part of the input image or the relevant subset of the histogram range.

Tips¶

You may need to smooth the input histogram and perform morphological filtering on the output to get meaningful segmentations from noisy images.

If using the full input image histogram you will probably end up with a segmentation of the background only.

Windows¶

Default Panel¶

../../../Modules/Macros/HistogramThresholding/mhelp/Images/Screenshots/NearHistogramPeakVoxels._default.png

Input Fields¶

input0¶

name: input0, type: Image¶: Some scalar input image.

curveInput¶

name: curveInput, type: MLBase¶: Histogram or smoothed histogram of the input image or probably more useful some region of interest in the input image.

Output Fields¶

output0¶

name: output0, type: Image¶: Thresholded image

outImageBypass¶

name: outImageBypass, type: Image¶: Just a copy of the input may be used for simpler network layouts.

outCurveList¶

name: outCurveList, type: MLBase, deprecated name: outCurveBypass¶: CurveList visualizing the peak and the drop levels / values used in thresholding. Mainly intended for debugging.

Parameter Fields¶

Field Index¶

Autp Update: Bool

Peak Lower Drop Level: Double

Peak Lower Drop Value: Double

Peak Position: Double

Peak Upper Drop Level: Double

Peak Upper Drop Value: Double

Update: Trigger

Visible Fields¶

Peak Lower Drop Level¶

name: peakLowerDropLevel, type: Double, default: 90, minimum: 0, maximum: 100¶: Specified percentage of highest frequency in histogram. The highest x value below the peak position that were the frequency in the histogram falls below that percentage of the max. frequency determines the lower threshold (c.f. Peak Lower Drop Value).

Peak Upper Drop Level¶

name: peakUpperDropLevel, type: Double, default: 90, minimum: 0, maximum: 100¶: Specified percentage of highest frequency in histogram. The lowest x value above the peak position that were the frequency in the histogram falls below that percentage of the max. frequency determines the upper threshold (c.f. Peak Upper Drop Value).

Peak Lower Drop Value¶

name: peakLowerDropValue, type: Double, default: 556¶: c.f. Peak Lower Drop Level

Peak Upper Drop Value¶

name: peakUpperDropValue, type: Double, default: 627¶: c.f. Peak Upper Drop Level

Peak Position¶

name: peakPosition, type: Double, default: 596¶: The grey value with highest value in the histogram. If there are multiple values with the same frequency the lowest will be used as starting point for the drop levels search.

Update¶

name: update, type: Trigger¶: Update computation.

Autp Update¶

name: autpUpdate, type: Bool, default: TRUE¶: Auto update results on input or parameter changes.