IMAQ OCR Read Text 3 VI

LabView NI Vision

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IMAQ OCR Read Text 3 VI

Installed With: NI Vision Development Module

Reads the text in the image. The VI identifies all objects in the image based on the properties that you set, and then compares each object with every character in the character set file. For each object, the VI selects the character that most closely matched the object. The VI uses the substitution character for any object that did not match any of the trained characters. You use the Substitution Character property to specify the substitution character.

IMAQ OCR Read Text 3

ROI Descriptor specifies the ROI in which the VI performs this operation. The ROI must be a rectangle or rotated rectangle. Leave this input unwired to use the entire image for this operation.

Global Rectangle contains the coordinates of the bounding rectangle.

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

	ID refers to whether the contour is the external or internal edge of an ROI.
	Type is the shape type of the contour.
	Coordinates indicates the relative position of the contour.

IMAQ OCR Session specifies the OCR session on which this VI operates. To create a session, use the IMAQ OCR Create Session VI.

Image is the source image for this operation.

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.

	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.
	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.
	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.

Orientation specifies the orientation of the image data within the circular strip.

Baseline inside (0)	(Default) Specifies that the base of the image data is located along the inside edge of the circular strip.
Baseline outside (1)	Specifies that the base of the image data is located along the outside edge of the circular strip.

Character Reports contains additional information about each character that the VI read from the image.

Character Value specifies the identified character.

Classification Score indicates the degree to which the assigned character class represents the object better than the other character classes in the character set.

Verification Score returns the verification scores computed against the reference character for the character class. If a reference character does not exist for the character class, the score will be 0.

Verified is TRUE if the character has been verified against a reference character was found for the character class. Otherwise, this value is FALSE.

Character Statistics is cluster containing statistics about the characters OCR segmented in the ROI.

Threshold Range specifies the range used to threshold the character.

	Lower value is the lowest pixel value used during a manual threshold. The default is 1.
	Upper value is the highest pixel value used during a manual threshold. The default is 255.

Left Offset specifies the left offset of the character bounding rectangles in the current ROI.

Top Offset specifies the top offset of the character bounding rectangles in the current ROI.

Width lists the width of each of the characters you trained in the current ROI.

Height lists the height of each of the characters you trained in the current ROI.

Character Size lists the size of the character in pixels.

IMAQ OCR Session (dup) is the reference to the OCR session to which this VI operates.

Image (dup) has the same value as Image.

Read String is the string that the VI read.

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.

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

ROI Bounding Characters is an array that specifies the coordinates of the character bounding ROI.

Global Rectangle contains the coordinates of the bounding rectangle.

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

	ID refers to whether the contour is the external or internal edge of an ROI.
	Type is the shape type of the contour.
	Coordinates indicates the relative position of the contour.

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