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Hi <font color="#888888">Siddharth,<br>
<br>
I'm affraid you will have to provide some code to get useful
inputs.<br>
<br>
best regards<br>
sebastian<br>
<br>
PS: y</font><font color="#888888">ou can start by getting the
latest VTK version (5.9.0) from git</font><br>
<font color="#888888"><br>
</font>On 12/06/2011 11:05 AM, Siddharth Vikal wrote:
<blockquote
cite="mid:CADM22yxyGDvhiWBogiqTV7M5B_ZExryetZCQzSxPn6jwGRhjPw@mail.gmail.com"
type="cite">
<div class="gmail_quote"><span dir="ltr"></span>Hi,<br>
<div> <br>
Let me first describe the set-up. I'm using a quad core, linux
box with vtk 5.4. I'm using Qt for GUI, thus QVTKWidget. I'm
trying to visualize image frames (1280 x1280 pixels) being
captured from a camera device. The anticipated frame rate is
30 fps. I've 'capture frame' functionality happening in a
separate thread. A minimal vtk pipeline is set up using
vtkImageData, vtkImageMapper, vtkActor2D. Each time a new
frame arrives, update is callled on the vtk pipeline and the
main thread running Qt, is notified to perform render
operation using paint event of QVTKWidget. For
synchronization, mutex is used. This setup seems to work just
fine except from the performance predictability
standpoint.I've put timers in place to measure time taken for
each step.<br>
<br>
The problem is, the paint call (or eventually 'render' call)
is not behaving deterministically. For some frames, render
completes within 6-10 milliseconds, but for others,
inexplicably, it starts taking 50-70 milliseconds!! Now with
new frame arriving at every 33 milliseconds (30 fps), I start
loosing frames. I've tried the setup using vtkImageActor
(therefore without vtkImageMapper, vtkActor2D) as well, but
with similar behavior. <br>
<br>
I don't understand why is render taking 60-70 milliseconds?
The data is ready to be rendered. The in-deterministic aspect
is even more worrying.<br>
<br>
Can someone please help? It'll be greatly appreciated.<br>
<br>
regards<font color="#888888"><br>
Siddharth<br>
</font></div>
</div>
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