Adept AdeptSight Reference Guide - Manual (Page 68)

BilinearInterpolationEnabled
VPARAMETER
120
Specifies if bilinear interpolation is used to sample the input image. By default, bilinear interpolation is
enabled because it ensures subpixel accuracy.
Syntax
Micro V+
VPARAMETER (sequence_id, tool_id, 120, index_id, object_id) = value
value = VPARAMETER (sequence_id, tool_id, 120, index_id, object_id)
V+
VPARAMETER (sequence_id, tool_id, 120, index_id, object_id) $ip = value
value = VPARAMETER ($ip, sequence_id, tool_id, 120, index_id, object_id)
Remarks
Bilinear interpolation is crucial for obtaining accurate results with inspection tools. When a tool is
positioned in frame-based mode, the tool region of interest is rarely aligned with the pixel grid, which
results in jagged edges on edges of objects. The bilinear interpolation function smooths out the
jaggedness within the sampled image by attributing to each pixel a value interpolated from values of
neighboring pixels, which provides a more true-to-life representation of contours, as illustrated in the
following figure.
Uninterpolated sampling may provide a small increase in speed but will provide less accurate results.
Figure: Effect of Bilinear Interpolation
Type
BilinearInterpolationEnabled
AdeptSight Reference Guide, v3.2.x, Updated: 5/8/2012
Page 68