LPV Blob Library, provides functionality for blob analysis. More...

Data Structures
interface	ILBlob
	This interface holds single blob and provide functionalities of blob calculation, conversion and drawing. More...

interface	ILBlobAnalysis
	This interface provide functionalities of blob analysis. More...

interface	ILBlobFilter
	This interface provide functionalities of blob filtering. More...

interface	ILBlobResults
	This interface holds a collection of blob results. More...

class	LBlob

class	LBlobAnalysis

class	LBlobFilter

class	LBlobResults

Enumerations
enum	LPVBlobContourType { LPVBlobContourExternal = 0 , LPVBlobContourHole = 1 }
	This enumeration represents the type of the blob contour. More...

enum	LPVBlobDrawFlags { LPVBlobDrawContour = 1 , LPVBlobDrawHole = 2 , LPVBlobDrawCenter = 4 , LPVBlobDrawBoundingRect = 8 , LPVBlobDrawRegion = 16 , LPVBlobDrawIndex = 32 , LPVBlobDrawDefault = LPVBlobDrawContour + LPVBlobDrawCenter , LPVBlobDrawAll = 0xff }
	This enumeration represents the flags to control the blob drawing behavior. More...

enum	LPVBlobFeatures { LPVBlobArea = 0 , LPVBlobPerimeter = 1 , LPVBlobWidth = 2 , LPVBlobHeight = 3 , LPVBlobCircularity = 4 , LPVBlobConvexity = 5 , LPVBlobInertia = 6 , LPVBlobAspectRatio = 7 , LPVBlobSharpness = 8 , LPVBlobLuminance = 9 , LPVBlobContrast = 10 , LPVBlobCenterX = 11 , LPVBlobCenterY = 12 , LPVBlobColorV0 = 13 , LPVBlobColorV1 = 14 , LPVBlobColorV2 = 15 }
	This enumeration represents the numeric features of the blob. More...

enum	LPVBlobMergeType { LPVBlobMergeFromCenter = 0 , LPVBlobMergeFromLargest = 1 , LPVBlobMergeFromSmallest = 2 , LPVBlobMergeFromBrightest = 3 , LPVBlobMergeFromDarkest = 4 }
	This enumeration represents the way to do blob merging, especially the way to decide the start point for merging. More...

Detailed Description

LPV Blob Library, provides functionality for blob analysis.

This library provides functionality for blob analysis. To include the definitions of the library's classes, use the following directive:

Example Code

Enumeration Type Documentation

◆ LPVBlobContourType

enum LPVBlobContourType

This enumeration represents the type of the blob contour.

Enumerator
LPVBlobContourExternal	Use the external contours as the blob's contours, then the hole contours is the blob's holes.
LPVBlobContourHole	Use the hole contours as the blob's contours, then the external contours is the blob's holes.

◆ LPVBlobDrawFlags

enum LPVBlobDrawFlags

This enumeration represents the flags to control the blob drawing behavior.

Enumerator
LPVBlobDrawContour	Draw the contours
LPVBlobDrawHole	Draw the holes
LPVBlobDrawCenter	Draw the center of the blob
LPVBlobDrawBoundingRect	Draw the rotated bounding rect of the blob
LPVBlobDrawRegion	Draw all the pixels inside the blob as a mask
LPVBlobDrawIndex	Draw the index of the blob right to its center
LPVBlobDrawDefault	Default draw flags, which draws the contour and the center
LPVBlobDrawAll	Draw a blob with all components

◆ LPVBlobFeatures

enum LPVBlobFeatures

This enumeration represents the numeric features of the blob.

Enumerator
LPVBlobArea	Area of the blob, it's the total count of pixels inside the blob.
LPVBlobPerimeter	Length of the blob's external contour.
LPVBlobWidth	Length of the blob's rotated bounding rectangle's longer axis.
LPVBlobHeight	Length of the blob's rotated bounding rectangle's shorter axis.
LPVBlobCircularity	Shape factor for the circularity (similarity to a circle) of the blob, defined as: \[ \frac{4 \pi A }{ P^2 } \] where \( A \) is the blob's area, \( P \) is the blob's perimeter. The value is in range of (0, 1), for a perfect circle, it's 1.
LPVBlobConvexity	Shape factor for the convexity of he blob, defined as: \[ \frac{ A }{ A_{conv} } \] where \( A \) is the blob's area, \( A_{conv} \) is the area of the blob' bounding convex hull. The value is in range of (0, 1), for a convex polygon, it's 1.
LPVBlobInertia	Moment of inertia of the blob contour.
LPVBlobAspectRatio	Aspect ratio of the blob's rotated bounding rectangle, in range of (0, 1). It's 1 for a square.
LPVBlobSharpness	Sharpness calculated using all the pixels inside the blob.
LPVBlobLuminance	Average luminance calculated using all the pixels inside the blob.
LPVBlobContrast	Average contrast calculated using all the pixels inside the blob.
LPVBlobCenterX	The x-coordinate of the blob center
LPVBlobCenterY	The y-coordinate of the blob center
LPVBlobColorV0	Average 0-channel value calculated using all the pixels inside the blob.
LPVBlobColorV1	Average 1-channel value calculated using all the pixels inside the blob.
LPVBlobColorV2	Average 2-channel value calculated using all the pixels inside the blob.

◆ LPVBlobMergeType

enum LPVBlobMergeType

This enumeration represents the way to do blob merging, especially the way to decide the start point for merging.

Enumerator
LPVBlobMergeFromCenter	Starts from the center of the region
LPVBlobMergeFromLargest	Starts from the largest blob
LPVBlobMergeFromSmallest	Starts from the smallest blob
LPVBlobMergeFromBrightest	Starts from the brightest blob, whose average luminance is the biggest
LPVBlobMergeFromDarkest	Starts from the darkest blob, whose average luminance is the smallest

Data Structures