IMAQ Read Single Digit VI

LabView NI Vision

IMAQ Read Single Digit VI

Owning Palette: Instrument ReadersInstalled With: NI Vision Development Module

Reads 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).

IMAQ Read Single Digit

cbool.gif

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.

cgenclasstagrefflat.gif

Image is a reference to the source image.

ccclst.gif

ROI Descriptor is a descriptor that defines the ROI drawn by the user that corresponds to a quadrilateral surrounding the digit.

c1di32.gif

Global Rectangle contains the coordinates of the bounding rectangle.

c1dcclst.gif

Contours are each of the individual shapes that define an ROI.

cenum.gif

ID refers to whether the contour is the external or internal edge of an ROI.

cu32.gif

Type is the shape type of the contour.

c1di32.gif

Coordinates indicates the relative position of the contour.

cdbl.gif

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.

cerrcodeclst.gif

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.

cbool.gif

status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.

ci32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

cstr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

cbool.gif

Search Decimal Separator determines whether to look for a decimal separator after each digit. The default is FALSE.

istr.gif

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.

ii32.gif

Number is the value represented by the digit.

icclst.gif

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.

ierrcodeclst.gif

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.

ibool.gif

status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

ii32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

istr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.