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In the old SDK there were methods for setting the smallest spot item for the camera to report, using these.

SetOption(NP_OPTION_OBJECT_MASS_MIN, CComVariant(5));
SetOption(NP_OPTION_MINIMUM_SEGMENT_LENGTH, CComVariant(4));

In this new SDK, how can I tell the camera to exclude small spots of a few pixels in size?

This is for the s250e and V120.

Object size filtering is not currently available in the Camera SDK so we recommend implementing it at your application level if its something you require at this time.

In the next release of the Camera SDK we expect to provide the ability for some cameras to filter small objects at the hardware level before they are passed to the PC. This feature will not be available for V100/120 series cameras.

If you can tell us more about your application and why you require the feature then it would help us evaluate whether we should consider it for our development roadmap.