Fill Bounded Region

This option allows a region of one image, bounded by some known intensity contour, to be filled with a constant intensity. buffer. This option is very similar to [D Duplicate bounded region] except that a region of an image is set to a constant intensity rather than filled with some other image.

Cursor Positioning: Locate cursor inside region to be filled

The desired region is specified through a combination of locating a single point within the region, and specifying the intensity of the bounding contour. To locate the start point, the normal cursor submenu is invoked. For more details on the operation of the cursor, see the [H Help] option within the submenu. Note the chosen start point should not have an intensity equal to that of the region boundary.

Intensity for edge of region ?

The edge of the region is defined by some intensity level. All pixels lying on the same side of the bounding intensity level as the starting point, and which are connected to the starting point by similar pixels, will be included in the region.

Search 4 or 8 nearest neighbours ?

This choice determines the degree of connectivity required in defining the region. As each new pixel is added to the region, the routine searches around its four (<4>) or eight (<8>) nearest neighbours to determine if there are any further pixels to be added to the region.

Use what intensity ?

This entry specifies the intensity with which the region is to be filled. The value specified may be used in a number of ways.

Set, And, Or or Xor intensity ? This choice specifies how the intensity specified above is to be used. It may set (<S>) the pixel intensity or be used as a mask in a logical AND (<A>), OR (<O>) or eXclusive OR (<X>) operation on the intensity already there.

Window Selection: Bounding window for filling

The window selection submenu is produced to specify an outer bound on the region in which the filling is confined. The filling is confined to the intersection between the region satisfying the threshold criterion and the window specified by the window selection submenu. For more information on window specification, consult the [H Help] option within the submenu.

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DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996