Leginon

h1. RCT node set-up

h2. Testing feature finding algorithm

The default values in the RCT node may not work for your sample, trials should be made

to optimize the parameters. The good parameters should find hundreds, but not thousands of

features in your untilted image for good results.

*  Presets Manager> send the preset used in "Centered Square" to scope at the center

of a square.

*  RCT/toolbar> Click on the "acquire" button at the far right to acquire a test image

of which the feature finding algorithm will be applied after the acquisition.

*  RCT> Check the result of the numbers of feature found.  A few hundred but not

thousands would be a good settings.

*  RCT/Settings> Adjust Min Feature Size (most sensitive) and/or Max Feature Size or

the filters and then repeat 2 and 3 to get better results.

*  Target templates are applied to the valid raster points to create the final

acquisition and focus targets. The template can be constant, meaning that it is defined

relative to the image coordinate. The template can also be convolved with the raster

points which will create multiple targets, each defined relative to the coordinate of

the valid raster points.

*  Min/Max Feature Size: if  < 1, it means faction of the image area.  If > 1,

number of pixels.

*  List of Tilts to Collect are in the order of data collection

*  RCT node has its own drift monitoring after each tilt at the transformed focus

target position.  Therefore, drift threshold and drift preset need to be defined.