Volumetric scan data is stored as a rectangular prism of voxels that each have an attenuation value. The high-resolution source volume contains more voxels as well as more color depth than the Voyager Project Editor can support. The cropping step of the ROI Tool allows you to choose a spatial region of interest of your part that you wish to see in high resolution. In a similar way, the Renormalization step allows you to choose a subset of attenuation values that is most useful to you. Renormalization works by selecting a lower bound and an upper bound on attenuation values of interest, and clipping values outside this range - making the colors you see in the data more useful. The next section explains how to control this clipping.Documentation Index
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Understanding the Renormalization Options
There are three options in the Renormalize section of the ROI tool: Default Range, Selected Range and Full Data Range.- Default Range: Refers to the default normalization that Voyager applies to volumes after they have been created. Use this option to “reset” the volume to what Voyager typically displays for a data object.
- Selected Range: Refers to the user-specified values that the rangemapper and visualization show. Use this to choose a specific range of your data to renormalize to.
- Full Data Range: Refers to the raw, unclipped data. Use this if you believe the default range has clipped important data from your scan. This is possible with extremely high variation multi-material datasets where your application requires resolution of extremely different materials in one scan.
Renormalizing Selected Ranges
The below scan shows a standard low attenuation / high attenuation split. Renormalization allows you to isolate more dense and less dense material into separate data objects for individual analysis.