| Axismapping | Logical to physical axis mapping |
| bandroi | Sums of pixel values within a rectangular region of interest (ROI) (limited to a single band and interval) |
| Boundbracket | Used for interpolating new points between old points and boundaries |
| boundpoint | A point in a temporary temporary ring boundary representation |
| Boxed_boundary | The association of a chaincoded boundary and its bounding box |
| Devicestate | The bit pattern currently applied to the parallel port data register |
| dim_range | Represents a range of indicies, e.g., within a particular image dimension (bands, lines, pixels, etc.) |
| IMAGE_BYTE | Almost identical to an IMAGE structre, but subclassed to single-byte pixels |
| mheap | A fixed-size ordered queue (a heap structure) of goodness of fit values |
| mpos | The goodness of fit metric value from matching images, with their positions |
| overlap | Represents the overlap interval between two images |
| profile_node | Individual brightness profiles |
| Provisionalrings | Measurements for rings affected by an added or removed boundary (2 at most) |
| RECTANGLE | A rectangle aligned with the x and y axes |
| regimage_pyramid | A pyramid of images, ordered by resolution |
| regparam | Registration parameters for a particular downsampled image resolution |
| regparam_pyramid | A collection of settings for registering images at various resolutions |
| Ring_candidate | One ring in a list of rings (e.g., candidates for insertion or removal) |
| Roiframe | Holds a summary of the region of interest coordinate frame |
| Sad_doc | Each document contains a SADIE image with its property hash table |
| Sad_docitem | One node of the singly-linked list of documents hanging off a hash bucket |
| Sad_doclist | A hash table implements the list of documents |
| Sad_propertyitem | One node of the singly-linked list of properties hanging off a hash bucket |
| Stagecontrol | Grouping of definitions for one parallel port and all its dependent axes |
| Stagelocation | Coordinates representing a position along multiple axes |
| Translation | Everything needed to control a translational stage axis |
| xydisplace | Forward or backward displacement both horizontal and vertical |
