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
    • Safety, Security, Privacy, and Continuity of Operation
    • 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
    • Ballot QR Code Data Format
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  1. System Performance & Specifications

Reliably Detectable Marks

PreviousPaper Ballot SpecificationsNextSafety, Security, Privacy, and Continuity of Operation

Last updated 10 days 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. On both VxScan and VxCentralScan, the voting system does not process any marks as ambiguous. All marks are either valid or invalid.

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