Unlock Class Reference

Contains various methods to unlock the system. More...

#include <guardmypi.h>

Public Member Functions
int	loadcascade ()
	Loads the hand and face cascades used to unlock the system during daytime hours (7am-8pm) More...
int	face (Mat ReferenceFrame, clock_t startTime)
	This method takes the input frame from the camera if the time is between 8am and 9pm. More...
int	QRUnlock (Mat frame, clock_t startTime)
	This method is the alternative unlocking method once it is night time. More...
int	QRLock (Mat frame)
	This method looks for another QR code whilst the system is in its unlocked state. More...
int	Deactivate (Mat frame)
	This method searches for the user to reset the system when it's detected an intruder. More...

Public Attributes
int	faceflag = 0
	Flag set by facial recognition.
int	intruderflag = 0
	Intruder flag set by motion detector & face recognition.
int	lockflag = 0
	Lock flag set by QR Lock method.
int	QRunlockflag = 0
	Flag set by the QR Unlock method.
int	resetflag = 0
	Reset flag set when intruder flag is high and by QR Unlock method.
int	ID = -1
	Initial LBPH ID.
double	secondsPassed = 0.0
	Number of seconds passed since the current timestamp.

Protected Attributes
Mat	gray
Mat	thresh
Mat	new_avg
Mat	diff
Mat	GrayFrame
	Various members to contain a grayscale, threshold, running average and difference frame.
CascadeClassifier	hand_cascade
	Instance of the HAAR cascade object.
Scalar	color = Scalar(255, 0, 0)
CascadeClassifier	face_cascade
	Instance of the HAAR classifier for facial detection.
Ptr< LBPHFaceRecognizer >	recogniser = LBPHFaceRecognizer::create(1,8,8,8,123)
	Instance of LBPH algorithm.
double	confidence = 0.0
	Confidence level is altered by the LBPH algorithm of the chances it is the correct face.
string	name
	Name of the recognised resident.
QRCodeDetector	qrDecoder
	Instance of the QR Code detection object.
Mat	bbox
Mat	rectifiedImage
	Holds the rectified QR Code and position of the QR Code.

Detailed Description

Contains various methods to unlock the system.

Facial recognition utiises a LBPH algorithm to preict a detected face. QR detection is also implemented using the QRCodeDetector object.

Member Function Documentation

Deactivate()

int Unlock::Deactivate

(

Mat

frame

)

This method searches for the user to reset the system when it's detected an intruder.

By essentially setting the intruder flag to 0 and all unlock method flags to high the system enters it's disarmed state

Parameters

frame

Input frame from the camera feed

Returns

1 to escape function once QR code is detected

0 to escape function if the incorrect/no QR code is detected

face()

int Unlock::face	(	Mat	ReferenceFrame,
		clock_t	startTime
	)

This method takes the input frame from the camera if the time is between 8am and 9pm.

It additionally takes the time stamp called immediately before the function. The method looks for a particularly trained face depending on the trained algorithm (*.yml file), which if not detected in less than 10s return 0 and set the intruder flag high alerting the user.

See also

Unlock::loadcascade()

Parameters

ReferenceFrame	Input frame from the video frame capture
startTime	Time stamp initially called prior to the methd

Returns

camerafeed with or without "Motion Detected" text to signify code functioning

loadcascade()

int Unlock::loadcascade

(

)

Loads the hand and face cascades used to unlock the system during daytime hours (7am-8pm)

See also

Unlock::face

QRLock()

int Unlock::QRLock

(

Mat

frame

)

This method looks for another QR code whilst the system is in its unlocked state.

Until the camera detects a QR code with a key called "lock" then nothing happens.

Parameters

frame	Input frame from the camera feed
startTime	Time stamp initially called prior to the methd

Returns

1 to escape function once QR code is detected

0 to escape function if the incorrect/no QR code is detected

Condition looking for a QR Code

QRUnlock()

int Unlock::QRUnlock	(	Mat	frame,
		clock_t	startTime
	)

This method is the alternative unlocking method once it is night time.

See also

Unlock::loadcascade() Unlock::face()

Parameters

frame	Input frame from the video frame capture
startTime	Time stamp initially called prior to the methd

Returns

1 to escape function once QR code is detected

0 to escape function if the incorrect/no QR code is detected