Read Barcode (G Dataflow)

Coordinates of the bounding rectangle.

Individual shapes that define an ROI.

ID

Object specifying if contour is the external or internal edge of an ROI.

Type

Shape type of the contour.

Coordinates

Relative position of the contour.

Minimum bar width of the barcode in the image, in pixels.

The node relies on this parameter to determine barcode characteristics to locate the barcode in the image.

Minimum difference in intensity values to allow between the edge of a barcode and its surroundings.

A lower value helps locate low-contrast barcodes. A higher value helps remove noise.

Minimum number of bars required in the barcode to be qualified for reading.

Boolean that specifies if the node assumes that the barcode occupies most of the image or the search region.

If TRUE, the node skips the location phase and moves immediately to extraction and decoding.

Default: FALSE

Boolean that specifies if grading report should be generated.

Default: FALSE

Aperture or width of the problem to use while scanning the barcode to calculate the grading report.

Default: 1

Decoded barcode data.

Information about the barcode, depending on the type of barcode read.

• Codabar—If the node reads a Codabar barcode, this parameter returns the start character.
• Code 128—If the node reads a Code 128 barcode, this parameter returns the FNC character.
• EAN 8 and EAN 13—If the node reads an EAN 8 or EAN 13 barcode, this parameter returns the first country code.

For all other barcodes types, the value of this parameter is set to 0.

Information about the barcode, depending on the type of barcode read.

• Codabar—If the node reads a Codabar barcode, this parameter returns the stop character.
• EAN 8 and EAN 13—If the node reads an EAN 8 or EAN 13 barcode, this parameter returns the second country code.
• UPCA—If the node reads a UPCA barcode, this parameter returns the system number.

For all other barcodes types, the value of this parameter is set to 0.

Error correction information added to the encoded data to validate the decoded data.

Because checksum is not part of the input data, it is not returned in the output string. Not all barcode types have checksum error correction capabilities. In many cases, the text printed below the barcode contains the encoded data, including the checksum. For example, an EAN-13 barcode can display text containing 13 numeric digits. The first 12 digits represent the actual input data and the thirteenth is the checksum.

Type of barcode read.

Quality measure of the decoded barcode ranging from 0 to 1000, with 1000 being the best.

This value weights the error in the widths of the bars and spaces with the size of the character in the barcode. In general, a confidence level of less than 800 means the decoded string is suspect. confidence level is useful in decoding EAN 13 barcodes because 11 of the 12 values are encoded as characters in the barcode, and the twelfth value is encoded by the parity of the first 11 encoded characters

Array of points that define the boundary of the code in the image.

x

x is the x-coordinate of the point.

y

y is the y-coordinate of the point.

Grade of the barcode (A, B, C, D or F) .

For each scan line, an overall scan grade is calculated as the lowest of all the other eight grades (not including the quiet zone). The overall grade displayed is the average of these ten scan grades.

Grade that specifies if there are enough elements, or bars and spaces, present in the barcode for it to be decoded.

A result is either A (pass) or F (fail). Excessive bar growth, ink spread, or weak printing of narrow bars can result in an F grade.

Letter grade assigned to a barcode based on the minimum reflectance score, or the ratio of the intensity of the darkest bar to the lightest space.

The darkest bar must have intensity less than or equal to half of the space. For example, if the highest intensity value of the spaces is 80%, the intensity value of at least one bar must be 40% or less. The grade is either A (pass) or F (fail).

Letter grade assigned to a barcode based on the minimum edge contrast score, or the lowest contrast in any edge or transition from bar to space and vice versa.

The grade is either A (pass) or F (fail). Incorrect bar color or background color and unfocused print will yield a low grade.

Letter grade assigned to a barcode based on the symbol contrast score, or the difference between the intensity of the darkest bar and lightest space of the barcode.

The grade varies from A to F. Low contrast means either the bars are too light or the background is too dark or both.

Letter grade assigned to a barcode based on the modulation score, or the ratio of min edge contrast score and the symbol contrast score.

This output measures the uniformity of the intensity of the bars and spaces in the barcode. The grade varies from A to F. Press gain or undesirable bar widening causes a low modulation grade.

Letter grade assigned to a barcode based on the amount of noise present in the barcode.

The noise can exist as white gaps on the bars, or less ink, and dark gaps on spaces, or dirt. The grade varies from A to F.

Letter grade assigned to a barcode based on the success of the node in decoding or reading the barcode.

The grade is A if the barcode is decoded, otherwise it is F.

Letter grade assigned to a barcode based on its decodability score, or the measure of the accuracy of the printed bar code against the appropriate reference decode algorithm.

The theoretical bar widths are compared with the actual bar widths obtained from the barcode to calculate the deviation and higher this deviation, the lower the grade. The grade varies from A to F. Uneven scanning, press gain or bar widening and bars with blurred and uneven edges lead to low decodability grades.

Letter grade that specifies if the quiet zone is present (A) or absent (F).

Scanners require a quiet zone to the left and right of the barcode symbol to be able to successfully decode the barcode. This area must be clear of all text or graphics. The quiet zone dimension requirements vary according to the type of the barcode.