vpRingLight Class Reference

#include <vpRingLight.h>

Public Member Functions
	vpRingLight ()
	~vpRingLight ()
void	pulse ()
void	pulse (double time)
void	on ()
void	off ()

Detailed Description

Ring light management under unix.

Warning

This class works only at Irisa with the Edixia's ring light system.

Here is an example showing how to synchronise the framegrabbing with the lighting system.

#include <visp/vpConfig.h>
#include <visp/vpImage.h>
#include <visp/vp1394TwoGrabber.h>
#include <visp/vpRingLight.h>

int main()
{
#if defined(VISP_HAVE_PARPORT) && defined(VISP_HAVE_DC1394_2)
  vp1394TwoGrabber g; // Firewire framegrabber based on libdc1394-2.x third party lib
  vpImage<unsigned char> I;

  vpRingLight light; // Open the device to access to the ring light.

  for (int i=0; i < 10; i++) {
    light.pulse(); // Send a pulse to the lighting system
    g.acquire(I); // Acquire an image
  }
#endif
}

Here is an example showing how to turn on the lighting during 10 seconds.

#include <visp/vpConfig.h>
#include <visp/vpRingLight.h>
#include <visp/vpTime.h>

int main()
{
#ifdef VISP_HAVE_PARPORT
  vpRingLight light;         // Open the device to access to the ring light.

  int nsec = 10;             // Time to wait in seconds
  light.on();                // Turn the ring light on
  vpTime::wait(nsec * 1000); // Wait 10 s
  light.off();               // and then turn the ring light off
#endif
}

Examples:

ringLight.cpp.

Definition at line 115 of file vpRingLight.h.

Constructor & Destructor Documentation

vpRingLight::vpRingLight

(

)

Constructor to acces to the ring light device connected to the parallel port.

Open and initialise the default parallel port device "/dev/parport0" to communicate with the ring light.

Exceptions

vpParallelPortException::opening

If the device used to access to the parallel port can't be opened. A possible reason is that you don't have write access.

Turn the ring light off.

Definition at line 77 of file vpRingLight.cpp.

References off().

vpRingLight::~vpRingLight

(

)

Destructor to close the device.

Turn the ring light off.

Exceptions

vpParallelPortException::closing

If the device used to access to the parallel port can't be closed.

Definition at line 90 of file vpRingLight.cpp.

References off().

Member Function Documentation

void vpRingLight::off

(

)

Turn the ring light off.

To turn the ring light on, see on().

Examples:

ringLight.cpp.

Definition at line 209 of file vpRingLight.cpp.

References vpParallelPort::sendData().

Referenced by vpRingLight(), and ~vpRingLight().

void vpRingLight::on

(

)

Turn the ring light on.

To turn the ring light off, see off().

Examples:

ringLight.cpp.

Definition at line 183 of file vpRingLight.cpp.

References vpParallelPort::sendData().

void vpRingLight::pulse

(

)

Activates the ring light by sending a pulse throw the parallel port.

The pulse width is 500 us. This pulse activates a NE555 which turns on on the light during 10ms.

Examples:

ringLight.cpp.

Definition at line 102 of file vpRingLight.cpp.

References vpParallelPort::sendData().

void vpRingLight::pulse

(

double

time

)

Activates the ring light by sending a pulse throw the parallel port during a specified duration.

Parameters

time	: Duration in milli-second (ms) during while the light is turned on.

Definition at line 145 of file vpRingLight.cpp.

References vpParallelPort::sendData().