The values in the “Target Size” section of the Create Coded Target Dialog control the size of the targets and hence the number of targets placed on each page. The ‘Output’ area tells you how many rows and columns of targets there will be per page and the number of pages. These values update as the settings above change.
The “Targets per sheet” allows one to pick the number of targets on each sheet/page. This drop down sets the “Target Size” to control this. Depending on the paper size and other options, not all options of targets per sheet will be available.
The 'Inner target diameter' controls the size of the target’s inner dot (in millimeters) on the printed page (if printed at 100%). The size of this dot is important because this center dot needs to be recognized in the images by the Auto-marker. You would typically set this value based on the target that will be farthest from the camera. A center dot of about 10 pixels in diameter or larger is best for naturally lit targets and a retro-reflective target can be a bit smaller down to 5 pixels in diameter. Note that the dot diameter may not match the output exactly due to translations in the printer driver etc.
The total size of target depends on the outer diameter of the code ring(s), and this is shown by the “Coded ring diameter”. The coded ring refers to the outermost ring around the target, and so the overall size can be displayed in millimeters. Do note though when applying targets to your object or scene you’ll want white space around the target so that the outermost rings can be detected properly.
You can estimate the inner dot radius yourself or you can have an estimate computed using the 'Estimate' button and the Estimate Coded Target Radius Dialog. Also see the 'Percentage of diameter to use as border' that also affects the number of targets per page.
The “Paired targets with offset” option applies to RAD Coded targets only and only applies to using Print… (i.e. you cannot create a postscript file of offsets). This setting will output RAD Coded targets in pairs with a graphical indicator for offset location. These RAD coded target pairs are used with RAD and Coded Target Offsets. See the Offset Point section for an explanation on how to use and create offset points.
Also see Letter Sheet Automated Target Projects for information on setting up projects with preconfigured sets of coded targets.