Vfstruct, V3fstruct - structures for V4 images

Vfstruct(name)

V3fstruct(name)

Vfstruct is the command use to create and initialize a 2D image structure. The argument is the name of the image structure. Only one argument is permitted per command. The structure is defined by VisXimge_t.

V3fstruct is the command use to create and initialize a 3D image structure. The argument is the name of the image structure. Only one argument is permitted per command. The structure is defined by VisX3dim_t.

The pixel structure elements facilitate the access to pixel data. only one of these elements will be defined at at time depending upon the type of the image. For a Vfstruct, a 2D image is accessed by .u[y][x] for element x,y. For a V3fstruct, a 3D image is accessed by .u[z][y][x] for element x,y,z.

.bbx

The bounding box for the image (float[6])

.type

The base type of the image pixels

.chan

The number of channels in the image (e.g., color has 3)

.xlo

The lowest defined x index

.xhi

The highest defined x index

.ylo

The lowest defined y index

.yhi

The highest defined y index

.zlo

The lowest defined z index (V3fstruct only)

.zhi

The highest defined z index (V3fstruct only)

.u

VX_PBYTE, unsigned byte (the most common format for conventional images), and VX_PIDX indexed color

.s

VX_PSHORT, 16-bit signed integer

.i

VX_PINT, 32-bit signed integer

.f

VX_PFLOAT, 32-bit floating point number

.d

VX_PDOUBLE, 64-bit floating point number

.c

VX_PCHAR, 8-bit signed integer

.b

VX_PBIT, packed bit format (limited support)

Vfstruct and V3fstruct should not be declared within subprograms.

vfopen, v3fopen

A. P. Reeves