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ExtractBlobs_Color

Header:	FIL.h
Namespace:	fil
Module:	FoundationBasic

Segments an image into blobs by color-based thresholding.

Syntax

void fil::ExtractBlobs_Color
(
	const fil::Image& inImage,
	ftl::Optional<const fil::ShapeRegion&> inRoi,
	ftl::Optional<const fil::CoordinateSystem2D&> inRoiAlignment,
	const fil::ColorThresholdParams& inThresholdParams,
	const fil::RegionProcessingParams& inRegionProcessingParams,
	const fil::BlobSplittingParams& inBlobSplittingParams,
	ftl::Array<fil::Region>& outBlobs,
	ftl::Array<int>& diagBlobAreas,
	fil::Region& diagBaseRegion
)

Parameters

Name	Type	Default	Description
inImage	const Image&		Image from which blobs are extracted
inRoi	Optional<const ShapeRegion&>	NIL	Range of pixels to be processed
inRoiAlignment	Optional<const CoordinateSystem2D&>	NIL	Adjusts the region
inThresholdParams	const ColorThresholdParams&		Parameters for color-based thresholding
inRegionProcessingParams	const RegionProcessingParams&		Parameters for opening and closing of a region
inBlobSplittingParams	const BlobSplittingParams&		Parameters for splitting region into blobs
outBlobs	Array<Region>&		Blobs extracted from the input image
diagBlobAreas	Array<int>&		Areas of extracted blobs
diagBaseRegion	Region&		Region of pixels right after thresholding

Requirements

For input inImage only pixel formats are supported: 1⨯uint8, 2⨯uint8, 3⨯uint8, 4⨯uint8.

Read more about pixel formats in Image documentation.

Description

This filter can be used to quickly segment an image using color-based thresholding. It performs a series of operations on inImage:

image is thresholded by ThresholdToRegion_Color 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

ExtractBlobs_Color performed on the sample image with inThresholdParams.RgbColor = (189, 36, 25), inThresholdParams.MaxDifference = 40.0 and inRegionProcessingParams.ClosingRadius = 5.

Errors

List of possible exceptions:

Error type	Description
DomainError	Region exceeds an input image in ExtractBlobs_Color.
DomainError	Not supported inImage pixel format in ExtractBlobs_Color.