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--- other:dsx:locate3d:digitize_points_of_interet [2024/07/12 13:55] – created sgranger
+++ other:dsx:locate3d:digitize_points_of_interet [2024/07/17 15:44] (current) – created sgranger
@@ Line 1: / Line 1: @@
-====== Digitize_Points_of_Interet ======
+====== Digitize Points of Interet ======
 To digitize a point of interest (POI) for the current reporting time, select the POI by clicking on its name in the table in the [[Other:DSX:Locate3D:Points_of_Interest|**Points of Interest**]] widget. The table row will be highlighted in blue, and when you move the cursor into one of the X-ray windows, the cursor will change to a cyan circle inside a yellow square, with the POI name to the right. The circle represents the expected size of the POI on the X-ray image, which is dependent on the pixel size of the image and the radius of the POI, which is specified in the subject file. The center of the circle is also marked by a cyan point. The square represents the region of the image that will be searched for the center of the POI (some of the outer pixels of the POI can be outside the square). The size of the square is controlled by the //Click Search Factor// parameter. A larger number makes it quicker and easier to digitize POIs, but you don't want the square to contain more than one POI. When you click the left mouse button, Locate3D will search the X-ray pixels within the square to determine which one is the best candidate for the center of the POI. This is done by using the //Centroid Threshold// parameter to separate the POI pixels from the background, and the //Edge Threshold// parameter to determine if these pixels represent a circular POI. The POI is assumed to be a bright circle on a dark background, with the center of the POI being the brightest. The 2D coordinates of the POI center in each view are calculated as the weighted center of the pixels above the //Centroid Threshold//. The values of these parameters can be changed in the [[Other:DSX:Locate3D:POI_Parameters|**POI Parameters**]] widget.