IMAQ Read Single Digit VI
Owning Palette: Instrument ReadersInstalled With: NI Vision Development ModuleReads a single seven-segment digit from a rectangular area of interest drawn around this digit. This VI reads LCD and LED indicators. It returns a value as a string and a cluster containing the state of each segment (ON or OFF).
LCD/LED (LCD) is a Boolean that controls the indicator type. FALSE corresponds to LCD indicators, and TRUE corresponds to LED indicators. The default is FALSE. |
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Image is a reference to the source image. |
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ROI Descriptor is a descriptor that defines the ROI drawn by the user that corresponds to a quadrilateral surrounding the digit.
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Threshold is the threshold that determines whether a segment is ON or OFF. A segment is considered ON if the standard deviation of the pixels along a line profile across the segment is greater than this threshold. Increase this value when using images with high contrast. Lower this value when using images with low contrast. The default is 8. |
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error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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Search Decimal Separator determines whether to look for a decimal separator after each digit. The default is FALSE. |
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String contains the value of the digit and decimal separator. If Search Decimal Separator is enabled, the decimal separator is represented in the string by a period (.) symbol. |
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Number is the value represented by the digit. |
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Segments status is a cluster of Boolean indicators containing the state of each segment of the digit. The order of the cluster is illustrated below. |
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.
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