Hardware manual

Line Profile Impact Reference Guide
Datalogic Automation Inc. 3-60
two and includes the overlap area, but not any pixels from image one, then the ROI uses all image two pixels
to provide the most accurate results with no seam and with distortion correction. The image display may
look odd because the displayed pixels are from image one, but the results are based on image two pixels.
Special Note for Stitched Images with Distortion
If individual images are overly distorted due to lens anomalies, a miscalculated field of view, incorrect lens-
ing, or other conditions, it may appear that the displayed found pixels are offset from the pixels on the result-
ing stitched image. The tool output data are properly corrected for distortion and any calculations on grid
location work correctly.
Distortion correction is applied to individual images before they are stitched to create a virtual image. (Usu-
ally distortion should only be found at the edges of an image and is correctable.) After the individual images
are stitched, this mathematical information is not available, so when the tool operation is performed, the dis-
played found pixels may look like they are offset from the object pixels on the image.
The found pixel location calculations are correct, but the image looks distorted in the image display and the
pixel locations look misplaced.
In short, the inspection result numbers are good even if the results do not appear correct on the image.
Line Profile
In the Image Geometry Drawer
The Line Profile tool reads the pixel grey level values from a single line segment and outputs them as a list
of reals. The pixel values are scaled so the outputs are in the range of zero to one hundred percent.
Multiple Image Stitch
In the Image Geometry Drawer
The Multiple Image Stitch tool provides semi-automatic stitching of multiple images into one larger image
(up to 8Mb total). (On the M-Series device, the output image must be less than 32k pixels high or wide with
a total image size limited by the amount of PC memory.) For example, you can take several images of sec-
tions of a large part, then stitch them together to inspect the whole part. The tool takes an image list and
stitches those images together based on their order in the list and the tool’s input settings. The images are
stitched into a one or two-dimensional array with a consistent overlap in both the x and y directions. The tool
uses correlation pattern matching (based on the Stitching Threshold property) to match the overlap regions
and insure accurate stitching.
The Image Motion input values indicate how far the camera or part moves between snaps. These values do
not exactly define the image stitching, as they do in the Image Stitching With Origins tool, but they should
Input Name What it is
Input Image Linked Image
Tool Origin The tool’s origin relative to the entire image space
Line Segment The line segment that reads the pixel grey level values.
Output Name What it is
Pixel Value List A list of pixel grey levels