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In this section, some techniques are presented that apply to scanning applications in general, independent of the API you use. Where necessary, differences in usage are pointed out. |
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Tricks for High Speed Scanning
High speed scanning, which is roughly anything over 300 scans per second, can get tricky. These are the factors that must go into your system.
The MaxLaserOn Parameter
MaxLaserOn is MaxLaserOn is related to the inverse of the number of the scans per second that you want and the 300 microsecond overhead for reading image data from the camera. Here's the formula for calculating the MaxLaserOn valuethe MaxLaserOn value:
1000/Scan Rate Rate - 0.3 = MaxLaserOn MaxLaserOn
A system that requires 500 scans per second would have a MaxLaserOn calculated a MaxLaserOn calculated like this:
1000/500 500 - 0.3 = 2 - 0.3 = 1.7 (milliseconds)
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Reducing Analyzed Image Area
- Scan Window JSDiag visually displays the current Scan Window as a yellow bounding box in the Image View and Laser Image View. The Scan Window should be reduced to the smallest possible area to improve speed and ambient light immunity. The scanner will only analyze the absolute minimum portion of the image that could produce valid data points, increasing the maximum Scan Rate. Also, automatic exposure is calculated using data points only from within the Scan Window, which improves ambient light immunity. Due to the camera type, the scanner analyzes the data from the near end until it reaches the end of the valid area. The Scan Window parameters are WindowTopare WindowTop, WindowLeft, WindowRight and WindowBottom WindowLeft, WindowRight and WindowBottom.
- Far Away Scan Window A common situation for scan windows is that they are far away from the scanner. Valid data can not appear near the scanner, so in this example the Scan Window is defined to include only the area of interest. In this case, the image will be analyzed from the near part of the image to the far extent of the valid Scan Window. The remainder of the image will not be analyzed, which will reduce the amount of time it takes to process it.
- Near Scan Window If the Scan Window includes the area closer to the scanner than it can see, then only the Scan Window is analyzed.
- ImagePercentage Parameter (Deprecated) ImagePercentage is a brute force way of accomplishing the same thing, but it is more quantifiable. If you set the ImagePercentage to 33, then a maximum of one third of the image will be analyzed. We recommend not using this parameter; the Scan Window accomplishes the same thing as perfectly as possible and has more reliable ambient light immunity.
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What Happens When The Scanner Overdrives While in the process of tuning a system, these are the indicators of trying to run a scanner too fast.
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