how to set a fps of a camera? - c

Question

I am using a frame grabber inspecta-5 with 1GB memory, also a high speed camera "EoSens Extended Mode, 640X480 1869fps, 10X8 taps". I am new to coding for grabbers and also to controlling the camera. the Inspecta-5 grabber, gives me different options, like changing the requested number of frames from the camrea to grabber and also from grabber to main memory. also I can use camrea links to send signal to camera and have different exposure times.
but Im not really sure what should I use to obtain 1000 frame per second rate, and how can I test it?
according to the software manual if I set the following options in the camera profile :
ReqFrame=1000
GReqFrame=1000
it means transfer 1000 frames from the camera to grabber and also transfer 1000 frame from grabber to Main memory, respectively.
but does it mean that I have 1000fps?
what would be the option for setting the fps to 1000 ? and also how can I test it that I really grabbed 1000 frames in One Second????
here is a link to the grabber software manual : mikrotron.de/index.php?de_downloadfiles you can find the software manual under the "Inspecta Level1 API for WinNT/2000/XP" section. the file name is "i5-level1-sw_manual_e.pdf" , just in case if anybody needs it.
THANK YOU

Answer 1

At 1,000fps you don't have much time to snap a frame or even save a frame. Use the following example and plug in your estimated FPS, capture and save latencies. At 1,000fps, you can have a total of about .8ms latency (and why not .99999? I don't know - something to do with unattainable theoretical max or my old PC).
public static void main(String args[]) throws Exception {
int fps = 1000;
float simulationCaptureNowMS = .40f;
float simulationSaveNowNowMS = .40f;
final long simulationCaptureNowNS = (long)(simulationCaptureNowMS * 1000000.0f);
final long simulationSaveNowNowNS = (long)(simulationSaveNowNowMS * 1000000.0f);
final long windowNS = (1000*1000000)/fps;
final long movieDurationSEC = 2;
long dropDeadTimeMS = System.currentTimeMillis() + (1000* movieDurationSEC);
while(System.currentTimeMillis() < dropDeadTimeMS){
long startNS = System.nanoTime();
actionSimulator(simulationCaptureNowNS);
actionSimulator(simulationSaveNowNowNS);
long endNS = System.nanoTime();
long sleepNS = windowNS-(endNS-startNS);
if (sleepNS<0) {
System.out.println("Data loss. Try again.");
System.exit(0);
}
actionSimulator(sleepNS);
}
System.out.println("No data loss at "+fps+"fps with interframe latency of "+(simulationCaptureNowMS+simulationSaveNowNowMS)+"ms");
}
private static void actionSimulator(long ns) throws Exception {
long d = System.nanoTime()+ns;
while(System.nanoTime()<d) Thread.yield();
}