### ISO 15416 Verification Tool Parameters

##### Symbology Types

Click the Symbology Types you want to verify to the ISO 15416 standard.

##### Verification Settings

Click the Verification Settings area of the parameters to bring up the controls for Aperture, Signal Compensation, Lighting, and Setup Notes.

- Aperture automatically sets the aperture size to the user-defined percentage of the decoded cell size.

- Signal Compensation compensates for uneven lighting. This parameter improves grading performance, but note that it is not a part of the ISO 15416 standard, and therefore not technically compliant.

- Lighting Wave Length specifies the wavelength of the lighting being used. Note that this value is for reporting only and does not affect verification results.

- Lighting Angle specifies the angle of the lighting being used. Note that this value is for reporting only and does not affect verification results.

- Setup Notes allows you to record any additional information that needs to be considered about your camera or lighting configuration.

##### Calibration

Click the Calibration section of the parameters to bring up the dialog shown below. The Calibration dialog features simple instructions about how to calibrate your camera and the Verification Tool in order to be compliant with your chosen verification specification. You must have a Calibration card in order to calibrate your system.

Use this dialog to enter the data from your Calibration card, and then click the Calibrate button to start the process.

As part of the calibration process, the Exposure Time setting of your camera will be adjusted. Use the Maximum Exposure value in the Calibration dialog to set the maximum Exposure Time that can be set.

Precautions for Correct Use: Verification tools must be calibrated first to achieve accurate results.

##### Custom Verification

When you click the box next to Enable Customized Verification Tests, you will see the dialog shown below. This dialog allows you to select the individual attributes on which the verification will be based, and to define Good/Fair/Poor ranges for each attribute.

Precautions for Correct Use: Disabling parameters using the Custom Verification dialog results in a verification process that no longer strictly conforms to the ISO 15416 standard.

Custom Verification Editor

The Custom Verification Editor is used to define when grades are considered Good or Fair. ISO 15416 reports a floating point grade value and allows you to define limits for Good or Fair based on letter grades. If you want to specify numeric values for Good and Fair limits, check the Use Numeric Values (for floating point control) option. The standard ABCDF control is replaced with a different control that allows you to enter any numeric value for Good and Fair limits.

ISO 15416 Verification Parameters

- Edge Determination: Bar and space edge transitions are defined by where they cross the global threshold of the symbol. The global threshold is the midpoint of the maximum reflectance (brightest) and the minimum reflectance (darkest) sample in the scan line. If the global threshold is crossed more than once per bar space transition or does not cross between one of these bar space pairs the symbol will not be able to decode and will receive an F grade for Edge Determination. If the proper number of element transitions occurs the symbol will receive an A grade for Edge Determination.

- Decode: The decoding of the symbol using the symbology reference decode algorithm using the element edges found in Edge Determination.

- Symbol Contrast: The difference between the highest and the lowest reflectance values in a scan reflectance profile.

- Minimum Reflectance: Percentage value of reflectance of darkest bar.

- Minimum Edge Contrast: Percentage value of minimum edge contrast. Edge Contrast is the difference between the bar reflectance and space reflectance of two adjacent elements.

- Modulation: The ratio of minimum edge contrast to symbol contrast.

- Defects: Irregularities found within elements and quiet zones, measured in terms of element reflectance non-uniformity.

- Decodability: Decodability can be defined as the amount of margin remaining to properly read the characters in the symbol. Each symbology specification graded under ISO 15416 has published dimensions and margins of tolerance for the decoding of characters. Printing and imaging accuracy will impact these dimensions and the ability to decode the symbol. Decodability quantifies this margin for each symbol.

- Quiet Zone: The regions before the start and stop characters. Each symbology specification graded under ISO 15416 has published the required amount of Quiet Zone for both the region before the start and after the stop character. The Quiet Zone is measured as an integer factor of the nominal bar width. For example, 10x would be a quiet zone 10 times larger than the nominal bar width. If either the start or stop Quiet Zone is violated, the scan line will receive an F grade for the Quiet Zone for that scan line.

Note: Conversion from ISO numeric grades to ANSI letter grades:

3.5 to 4.0 is A

2.5 to 3.5 is B

1.5 to 2.5 is C

0.5 to 1.5 is D

0.0 to 0.5 is F