Template Matching - NCC

Hello Bingnan,

I am currently quite busy, so answers may take a while or won't cover the full detail.


To your question: "1. The trigger example seems to be receiving an external trigger signal, then triggering the camera. How can I make the output-triggering signal controllable?"

If you open the "Hierachical Box" you will find the following layout:

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In the "Select" Operator you can choose the Triggermode, in your case the one you are looking for is the setting "1", so that the signal from "Generator" gets used as a Trigger.

If you go deeper into the "Generator" you can see the following:

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The Operator "Period" can then adjust your signal. Please read the textboxes for further instructions on how to adjust the trigger signal.

To your secon question:
"2. With the "Overflow", is that means I can use a larger template? Or it is limited by the resources the "Overflow" controls transfer bits but no effect on this?"

The overflow operator CUTS off an image, when a memory element is not capable of holding saving the image.
As you can see in your screenshot from MicroDisplay you have a "1" on Overflow. This means that the memory is not capable of saving the required data with the chosen bandwidth.


The following screenshots describe areas where you have bootlenekcs in your design:
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This will result in your processing pipeline only be able to handle 125 MegaPixel/s , since the SYNC operator creates dummy pixels.

Also after this HBox you have a ParallelDN that will limit your bandwidth.

This is all the help I can give you at the moment, please try to remove those bottlenecks, with operator suchs as ParallelUP before the SYNC operator etc.

Best Regards


Kevin

Quote from Bingnan Liu

For the aimed bandwidth: I would like to cut the ROI to 1280x300 (0.384 megapixels), and the processing speed ideally achieves 1000 frames per second. So the bandwidth rate would be 384 MHz.

As for the current frame rate, theoretically, with parallelism 1 should be 125Mhz with 113 fps; but when I adjusted ROI in GenCam as 1280x300, even though I set 113 fps, there was still overflow occurs (detected by the Overflow operator, explained in the forum post). So I guess there is something wrong with my design.

Could anyone help with my design?

Dear Bingnan Liu,

if you could post your VA design over here, I could have a look into it and give some explanations of what is going "wrong" or what needs to be changed. The connected camera configuration would be a welcome detail, since it may affect the bandwidth considerations.
Best regards,

Thank you for providing those details.
Currently I am on travel, but as soon as possible I will have a look into it.
Best regards,

Dear Bingnan,

Sorry for the late reply. Please try the following steps:

1. Check if you lower the frame rate at which point there is no longer an overflow (best to start with 1 FPS and then increase it until it overflows)
2. Next to changing the camera parameter you must also adapt the value "YLength" and "XLength" of the FullResBuf in your design according to the RoI of the camera, because otherwise the Buffer will add Dummy pixels. This might cause an overflow.
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Best Regards,

Kevin