checks the number of fingers and sends the respective command to be processed. More...

#include <FingerCounter.h>

Collaboration diagram for GestureDetection::FingerCounter:

Public Member Functions
	FingerCounter (void)

FingerAndCoordinates	findFingersCount (Mat input_image, Mat frame)

void	ConnectCallback (CaptureAndDetectCallbackInterface *)

Private Member Functions
int	getFinger ()

Point	getHighestPoint (const Mat &frame, const vector< vector< Point >> &contours, int biggest_contour_index, vector< Vec4i > &defects)

Point	farthest_point (vector< Vec4i > defects, vector< Point > contour, Point centroid)

double	findPointsDistance (Point a, Point b)

double	findAngle (Point a, Point b, Point c)

Private Attributes
Scalar	color_blue
	scalar to store blue color More...

Scalar	color_green
	scalar to store green color More...

Scalar	color_white
	scalar to store white color More...

Scalar	color_yellow
	scalar to store yellow color More...

CaptureAndDetectCallbackInterface *	palmCallback
	Callback interface to detect fist. More...

vector< int >	fingers
	to store number of fingers in the buffer for 15 frames More...

int	currentFinger = 0
	store the current detected finger More...

int	oldFinger = 0
	last detected finger More...

Point	oldFarPoint
	last detected far point More...

Iir::Butterworth::LowPass< 2 >	xFilter
	2nd order low pass iir filter to process x coordinates More...

Iir::Butterworth::LowPass< 2 >	yFilter
	2nd order low pass iir filter to process y coordinates More...

Detailed Description

checks the number of fingers and sends the respective command to be processed.

This class is called from the CaptureAndDetect after the initial image processing is done, the fingers and stored in the buffer. Once the buffer size is 15 the finger that occurs the most number of times in the buffer is considered and the appropriate command is sent. If finger is one or 3 then the coordinates are sent until a new finger is detected.

Definition at line 23 of file FingerCounter.h.

Constructor & Destructor Documentation

◆ FingerCounter()

FingerCounter::FingerCounter ( void )

The constructor for the FingerCounter class. Initializes the colors and iir filters.

Definition at line 5 of file FingerCounter.cpp.

Member Function Documentation

◆ ConnectCallback()

void FingerCounter::ConnectCallback ( CaptureAndDetectCallbackInterface * callback )

This function is used to connect the callback interface of CaptureAndDetect with this class

Parameters

callback The callback function that will be called when the fist is detected.

Definition at line 14 of file FingerCounter.cpp.

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◆ farthest_point()

Point FingerCounter::farthest_point	(	vector< Vec4i >	defects,
		vector< Point >	contour,
		Point	centroid
	)

private

It returns the point on the contour that is the farthest from the centroid

Parameters

defects	the convexity defects of the hand
contour	the contour of the hand
centroid	The centroid of the hand

Returns: the point with the highest y value.

Definition at line 150 of file FingerCounter.cpp.

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◆ findAngle()

double FingerCounter::findAngle	(	Point	a,
		Point	b,
		Point	c
	)

private

It finds the angle between the three points

Parameters

a	point one
b	point two
c	point three

Returns: The angle between the three points.

Definition at line 166 of file FingerCounter.cpp.

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◆ findFingersCount()

FingerAndCoordinates FingerCounter::findFingersCount	(	Mat	input_image,
		Mat	frame
	)

It finds the contours of the hand, finds the convex hull and the defects, and then counts the number of fingers

Parameters

input_image	The image that we want to find the fingers in.
frame	The frame from the camera

Returns: a struct of type FingerAndCoordinates.

Definition at line 18 of file FingerCounter.cpp.

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◆ findPointsDistance()

double FingerCounter::findPointsDistance	(	Point	a,
		Point	b
	)

private

It finds the distance between two points

Parameters

a	The first point
b	The second point.

Returns: The distance between two points.

Definition at line 161 of file FingerCounter.cpp.

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◆ getFinger()

int FingerCounter::getFinger ( )

private

It counts the number of times each finger is detected and returns the finger that is detected the most

Returns: The finger that is most frequently detected.

Definition at line 134 of file FingerCounter.cpp.

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◆ getHighestPoint()

Point FingerCounter::getHighestPoint	(	const Mat &	frame,
		const vector< vector< Point >> &	contours,
		int	biggest_contour_index,
		vector< Vec4i > &	defects
	)

private

It finds the highest point of the hand

Parameters

frame	The frame to draw on
contours	The contours of the hand
biggest_contour_index	The index of the biggest contour in the vector of contours.
defects	The convexity defects of the hand.

Returns: The highest point of the hand.

Definition at line 125 of file FingerCounter.cpp.

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Member Data Documentation

◆ color_blue

Scalar GestureDetection::FingerCounter::color_blue

private

scalar to store blue color

Definition at line 49 of file FingerCounter.h.

◆ color_green

Scalar GestureDetection::FingerCounter::color_green

private

scalar to store green color

Definition at line 51 of file FingerCounter.h.

◆ color_white

Scalar GestureDetection::FingerCounter::color_white

private

scalar to store white color

Definition at line 53 of file FingerCounter.h.

◆ color_yellow

Scalar GestureDetection::FingerCounter::color_yellow

private

scalar to store yellow color

Definition at line 55 of file FingerCounter.h.

◆ currentFinger

int GestureDetection::FingerCounter::currentFinger = 0

private

store the current detected finger

Definition at line 61 of file FingerCounter.h.

◆ fingers

vector<int> GestureDetection::FingerCounter::fingers

private

to store number of fingers in the buffer for 15 frames

Definition at line 59 of file FingerCounter.h.

◆ oldFarPoint

Point GestureDetection::FingerCounter::oldFarPoint

private

last detected far point

Definition at line 65 of file FingerCounter.h.

◆ oldFinger

int GestureDetection::FingerCounter::oldFinger = 0

private

last detected finger

Definition at line 63 of file FingerCounter.h.

◆ palmCallback

CaptureAndDetectCallbackInterface* GestureDetection::FingerCounter::palmCallback

private

Callback interface to detect fist.

Definition at line 57 of file FingerCounter.h.

◆ xFilter

Iir::Butterworth::LowPass<2> GestureDetection::FingerCounter::xFilter

private

2nd order low pass iir filter to process x coordinates

Definition at line 68 of file FingerCounter.h.

◆ yFilter

Iir::Butterworth::LowPass<2> GestureDetection::FingerCounter::yFilter

private

2nd order low pass iir filter to process y coordinates

Definition at line 70 of file FingerCounter.h.

The documentation for this class was generated from the following files:

src/gesture_detection/FingerCounter.h
src/gesture_detection/FingerCounter.cpp

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ FingerCounter()

Member Function Documentation

◆ ConnectCallback()

◆ farthest_point()

◆ findAngle()

◆ findFingersCount()

◆ findPointsDistance()

◆ getFinger()

◆ getHighestPoint()

Member Data Documentation

◆ color_blue

◆ color_green

◆ color_white

◆ color_yellow

◆ currentFinger

◆ fingers

◆ oldFarPoint

◆ oldFinger

◆ palmCallback

◆ xFilter

◆ yFilter