Detailed Description

Configuration parameters for BlobDetector.

Public Attributes
float	thresholdStep
	Step size in intensity units between successive threshold values in the range [minThreshold, maxThreshold).
float	minThreshold
	Lowest grayscale intensity used for binarization during the multi-threshold sweep.
float	maxThreshold
	Upper bound (exclusive) of the threshold sweep.
size_t	minRepeatability
	Minimum number of threshold levels at which a blob must be redetected at roughly the same location before it is accepted in the final output.
float	minDistBetweenBlobs
	Minimum spatial separation in pixels between blob centers when grouping detections across thresholds.
bool	filterByColor
	If true, reject blobs whose binarized pixel value at the center differs from blobColor.
unsigned char	blobColor
	Expected binarized pixel value (0 = dark blob on bright background, 255 = bright blob on dark background) used when filterByColor is enabled.
bool	filterByArea
	If true, reject blobs whose contour area in pixels is outside [minArea, maxArea).
float	minArea
	Minimum contour area in pixels².
float	maxArea
	Maximum contour area in pixels² (exclusive).
bool	filterByCircularity
	If true, reject blobs whose circularity `4π·area/perimeter²` falls outside [minCircularity, maxCircularity).
float	minCircularity
	Minimum allowed circularity in [0, 1]. Values near 1 indicate round blobs.
float	maxCircularity
	Maximum allowed circularity (exclusive).
bool	filterByInertia
	If true, reject blobs whose inertia ratio (ratio of minimum to maximum second central moment eigenvalues) falls outside [minInertiaRatio, maxInertiaRatio).
float	minInertiaRatio
	Minimum allowed inertia ratio in [0, 1].
float	maxInertiaRatio
	Maximum allowed inertia ratio (exclusive).
bool	filterByConvexity
	If true, reject blobs whose convexity (contour area divided by convex-hull area) falls outside [minConvexity, maxConvexity).
float	minConvexity
	Minimum allowed convexity in (0, 1]. Values near 1 indicate compact, convex shapes.
float	maxConvexity
	Maximum allowed convexity (exclusive).

Member Data Documentation

◆ thresholdStep

float ImFusion::BlobDetector::Params::thresholdStep

Step size in intensity units between successive threshold values in the range [minThreshold, maxThreshold).

Smaller steps increase sensitivity to weak blobs but also runtime and the number of intermediate detections.

◆ maxThreshold

float ImFusion::BlobDetector::Params::maxThreshold

Upper bound (exclusive) of the threshold sweep.

Thresholds satisfy minThreshold <= t < maxThreshold.

◆ minRepeatability

size_t ImFusion::BlobDetector::Params::minRepeatability

Minimum number of threshold levels at which a blob must be redetected at roughly the same location before it is accepted in the final output.

Higher values suppress unstable detections that appear only at a single threshold.

◆ minDistBetweenBlobs

float ImFusion::BlobDetector::Params::minDistBetweenBlobs

Minimum spatial separation in pixels between blob centers when grouping detections across thresholds.

Also compared against blob radius so that overlapping blobs are merged into the same track rather than reported twice.

◆ minArea

float ImFusion::BlobDetector::Params::minArea

Minimum contour area in pixels².

Blobs smaller than this are discarded when filterByArea is enabled.

◆ maxArea

float ImFusion::BlobDetector::Params::maxArea

Maximum contour area in pixels² (exclusive).

Blobs with area greater than or equal to this value are discarded when filterByArea is enabled.

◆ filterByInertia

bool ImFusion::BlobDetector::Params::filterByInertia

If true, reject blobs whose inertia ratio (ratio of minimum to maximum second central moment eigenvalues) falls outside [minInertiaRatio, maxInertiaRatio).

Low ratios indicate elongated shapes.

◆ minInertiaRatio

float ImFusion::BlobDetector::Params::minInertiaRatio

Minimum allowed inertia ratio in [0, 1].

Also scales the confidence weight used when averaging sub-threshold observations of the same blob.

The documentation for this struct was generated from the following file:

ImFusion/Vision/BlobDetector.h