DataCard UltraGrafix Select Manuel d'installation télécharger pdf (Page 319)

Maxsys and MX Series Software Administrator’s Guide 307

Keep in mind that if the directory access permissions prevent storage of the

image, a time hit will be incurred on each image that comes along. This may

substantially slow down system performance.

Also keep in mind that if you are running multiple vision profiles per job, all

directed at the same storage directory, and all with capture enabled, the collisions

can be costly. In theory, if you have more than 10 vision profiles, this could result

in file naming competition which would force directory scans to be completed.

The competition could even result in some images failing to get stored at all, as

there are a fixed number of attempts made.

This is a best-effort service. Failure is not treated as an error. There will be no

error messages generated due to file name competition, nor for directory

permission problems.

At production time, you will need the “Datacard Maxsys” service's user account

to have read/write access to the output directory. At design-time, you need the

currently logged in user running diagnostics to have read/write access.

Ring Search Target Design

The target images for the Ring Search algorithm are simple BMP image files.

These image files use specially colored pixels to indicate different regions of the

image. The pixel colors are all grayscale values (red, green, and blue coordinates

of the same exact value). The colors are:

IGNORE (WHITE=255)

The background of the image must be perfect white. The search algorithm

knows to ignore these pixels.

FOREGROUND (BLACK=0)

Indicates the foreground pixels. These should be the centerline for the

actual reference mark itself.

BACKGROUND (GRAY=128)

Indicates a background pixel. This actually marks pixels that must be a

different color than the FOREGROUND pixels on the search images.

REFERENCE_POINT (DARK_GRAY=64)

Exactly 1 pixel must have this color. This is the reference point itself on the

target. For the "T" default target, this is the intersection of the horizontal

and vertical lines.

Custom targets can be designed to meet the specific needs of a design. Start with

the Target-T.bmp file given as part of the controller software distribution. You

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DataCard UltraGrafix Select Manuel d'installation Page 319