Segmenting Images Using Contours and Masks
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- "Using contours to segment a VOI"
- "Generating masks"
- "Converting VOI contours to masks"
- "Converting masks to VOI contours and paints"
- "Advanced Paint and Power Paint tools"
Understanding contours and masks
Before you indicate a volume of interest, it is helpful to determine whether to delineate the VOI by drawing a contour around a structure or to generate a mask.
A contour is an array of points. If the contour is a closed polygon, the area inside defines the VOI. Contours are scalar and can be grouped to form a single multicontoured VOI. Contours are particularly useful if you want to save a VOI that covers a large area because the resulting file is generally smaller than a comparable mask file.
A mask is a filter that selectively includes or excludes certain values. You can create a mask that includes the VOI areas and excludes all other areas. Masks are particularly helpful if you use other image analysis programs that require you to supply a mask. Masks can also be used to indicate a complex area of interest. MIPAV allows you to generate binary and short image type masks. Also, you can manually create masks using paint tools.
Segmenting Images Using Contours and Masks: Using contours to segment a VOI