Segmentation means assigning labels to image voxels that identify and separate objects in a 3D image. Avizo offers a large set of segmentation tools, ranging from purely manual to fully automatic: brush (painting), lasso (contouring), magic wand (region growing), thresholding, intelligent scissors, contour fitting (snakes), contour interpolation and extrapolation, wrapping, smoothing and de-noising filters, morphological filters for erosion, dilation, opening and closing operations, connected component analysis, images correlation, objects separation and filtering, etc.
Image segmentation, also known as classification or labelization and sometimes referred to as reconstruction in some fields, is the process of partitioning an image into multiple segments or sets of voxels that share certain characteristics. The main goal of segmentation is to simplify or change the representation of an image into something that is more meaningful and easier to analyze.