Calculation of frame rates of acquisition image using the 7 Format

So I finally got my Basler firewire (IEE1394b) camera to capture images at his rate max (120 fps).

But to do this, I need to use the '7' Format.... which is a bit confusing to me.  When I use the '7' Format, I can't specify the frame (frames per second) rate.  Apparently, you only specify the parameters (length, width, color / mono) of the image and the size of the packets and a few other things.

So, how can I calculate speed?  I need to know exactly how much time elapses between each image.  And it must be constant.  I can't have a different frame rate.

NEITHER told I can calculate the frame rate using this equation:

That comes from this article.

But I am skeptical because the article also says:

Please note that the time to transfer an image is slightly faster than the time it takes to acquire an image.

People out there can clarify this for me?  Is the frame rate constant?  And then I actually calculate when using size 7?

The rate will be constant.  It won't change from image to image.  The difficult part is to find what it is.

Basler camera manual will tell you how to calculate the frame rate.  There are three different calculations, and gives you the slower pace is one you use.  These calculations are accurate enough, I think.

Another possibility is to measure the frame rate, but that requires several seconds (or minutes) for a measurement precise.  The simplest method is to start a life-long and save a frame in time at the beginning, wait several seconds (or minutes) and save the time of another framework.  Subtract the chassis numbers, subtract the time and divide to get the frame rate.  With a wait of several minutes, it's extremely accurate.  To get the acquisition time, read an image whose value "Next Image", then save the chassis number and read the msec timer immediately after reading.  Using a flat sequence structure is probably the best to ensure that everything happens in the desired order.  If you loop playback, you will see real cadence cadence converge slowly.  Stop it when it is pretty accurate.

In a program I wrote, I controlled the pace by setting the shutter exposure time.  I used the derived formula of the Basler manual for cadence and reversed to calculate the shutter speed.  This only works if you have another way to adjust the brightness levels (opening, lighting, etc.).

Bruce

Tags: NI Hardware

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