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AVL.ExtractBlobs_DoG Method
Segments an image into blobs by thresholding Difference of Gaussians.
| Namespace: | AvlNet |
|---|---|
| Assembly: | AVL.NET.dll |
Syntax
public static void ExtractBlobs_DoG( AvlNet.Image inImage, AvlNet.Region inRoi, float inStdDev, float inStdDevRatio, float inKernelRelativeSize, AvlNet.IntensityThresholdParams inThresholdParams, AvlNet.RegionProcessingParams inRegionProcessingParams, AvlNet.BlobSplittingParams inBlobSplittingParams, out AvlNet.Region[] outBlobs, out int[] diagBlobAreas, out AvlNet.Region diagBaseRegion )
Parameters
| Name | Type | Range | Default | Description | |
|---|---|---|---|---|---|
 | inImage | AvlNet.Image | Image from which blobs are extracted. | ||
| inRoi | AvlNet.Region | Range of pixels to be processed. Default value: atl::NIL, or null. | ||
| inStdDev | float | <0.0f, INF> | 3.0f | Smoothing standard deviation for the smaller Gaussian kernel. Default value: 3.0f. |
| inStdDevRatio | float | <1.0f, INF> | 1.6f | Defines how many times larger is the second Gaussian kernel. Default value: 1.6f. |
| inKernelRelativeSize | float | <0.0f, 3.0f> | 3.0f | A multiple of the standard deviation determining the size of the Gaussian kernel. Default value: 3.0f. |
| inThresholdParams | AvlNet.IntensityThresholdParams | Parameters for thresholding an image. | ||
| inRegionProcessingParams | AvlNet.RegionProcessingParams | Parameters for opening and closing of a region. | ||
| inBlobSplittingParams | AvlNet.BlobSplittingParams | Parameters for splitting region into blobs. | ||
 | outBlobs | AvlNet.Region | Blobs extracted from the input image. | ||
 | diagBlobAreas | int | Areas of extracted blobs. | ||
| diagBaseRegion | AvlNet.Region | Region of pixels right after thresholding. |
Description
This filter can be used to quickly segment an image by thresholding Difference of Gaussians. It performs a series of operations on inImage:
- Difference of Gaussians is computed by DifferenceOfGaussians
- Difference of Gaussians is thresholded by ThresholdToRegion using parameters from inThresholdParams
- resulting region is opened and then closed by OpenRegion and CloseRegion using parameters from inRegionProcessingParams
- resulting region is split into blobs by SplitRegionIntoBlobs using parameters from inBlobSplittingParams
Examples
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ExtractBlobs_DoG performed on the sample image with inStdDev = 6.0 and inThresholdParams.MaxIntensity = -4.0.
