VxSuite TDP - v4
  • System Overview
    • Election Package
      • VxSuite Election Definition
      • Ballot Definition CDF
    • Hand Marked Ballots
    • Machine Marked Ballots
    • Cast Vote Records
    • VxScan Polls Reports
    • VxAdmin Results Exports
      • Tally Reports
      • Ballot Count Reports
      • CSV Exports
      • Write-In Adjudication Report
      • CDF ERR Export
    • Software Overview
    • User Roles
    • VxAdmin Function
    • VxCentralScan Function
    • VxAdmin & VxCentralScan Hardware
    • VxScan Function
    • VxScan Hardware
    • VxMark Function
    • VxMark Hardware
    • Ballot Interpretation
    • Diagnostics
    • Signed Hash Validation
  • System Performance & Specifications
    • Supported Voting Variations & Languages
    • System Limits
      • Maximum Tabulation Rate
    • Paper Ballot Specifications
    • Reliably Detectable Marks
    • Processing Capabilities
  • System Security, Auditing & Logging
    • System Security Architecture
      • Access Control
      • Artifact Authentication
        • Hashing of Continuously Exported Cast Vote Records
        • Preserving Voter Privacy
      • System Integrity
      • Networking
      • Password and Credential Policies
      • Defense-in-Depth and Least Privilege
      • Cryptography
    • Physical Security
    • Procedural and Operational Security
    • Audit Procedure
    • Logging
    • Vulnerability Management
    • Risk Assessment
    • Hardware Criticality and Supplier Analysis
  • Software Installation
    • Trusted Build
      • Build Machine Configuration
        • Installing Debian 12 on VxBuild
      • Online Phase
      • Offline Phase
      • Final Configuration
        • Secure Boot Signing
      • Hash/Checksum Verification of Dependencies
      • Virt Manager - Network Access & Troubleshooting
    • Imaging Machines
      • Preparing USB Drives for Imaging
      • Imaging
      • Basic Configuration Wizard
      • Verifying the Image Installed on a Machine
      • Software Installation Record Creation
  • System Operations & Training Manual
  • System Inspection & Logic and Accuracy Testing
  • System Maintenance Manual
  • Usability & Accessibility
  • Audio Visual & Display Screen Settings
  • Quality Assurance Manual
  • Warranty Model
  • Public Documents
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  1. System Performance & Specifications

Reliably Detectable Marks

PreviousPaper Ballot SpecificationsNextProcessing Capabilities

Last updated 1 month ago

Marks are determined valid and counted by the system if the amount of darker pixels in the bubble area exceeds a configurable "definite" mark threshold set in the Election Package system settings file. This mark threshold can be adjusted to have a stricter or looser interpretation of what is considered a valid mark. Marks are either valid or invalid — the voting system does not process any marks as ambiguous.

The recommended and default threshold is 7%. With this threshold setting, hand marked paper ballot interpretation detects a valid mark per the mark conditions described by VVSG 1.1.6-H.

At this default threshold, marks such as a light dot, a fold through a bubble, a stray mark outside of the bubble, or a small line just on the corner of a bubble will be considered invalid. Marks such as a completely filled bubble, half filled bubble, or an X in a bubble will be considered valid.

Examples of invalid and valid marks along with the score for that mark (in green) are shown below.

The mark threshold set on a scanner can be checked by an election official at any point by viewing the readiness report for that device as described in Diagnostics (see also & in the user manual).

Invalid Marks

Valid Marks

VxScan Diagnostics
VxCentralScan Diagnostics