Current condition
Keep the sample identity, approved expected decision, reference and recipe, product finish, lighting, background, position and production timing with each observed inspection result.
Industrial machine vision
Colour and Variant Verification Challenge-test checklist
Agree colour inspection challenge samples, lighting and acceptance boundaries. Record false accepts, false rejects, part-linked responses and controlled changes.
Photographs illustrate general machine-vision inspection. Colour and variant decisions must be assessed using representative products, agreed reference samples and the intended lighting and presentation.
Agree the colour or variant decision, approved reference samples, method, repetitions and acceptance limits before testing. Challenge good, bad and marginal products with representative lighting, finish, background, position and timing. Record expected and observed decisions, false accepts and false rejects, and the part-linked response to incorrect, uncertain or missing results.
Begin with the production inspection sequence and require the same comparison evidence from each concept. Keep unresolved cases and later reference or recipe changes within the agreed approval process.
On the production floor
Turn your production information into clearer decisions — Colour and Variant Verification
Plan colour and variant verification around representative good, bad and marginal samples, line presentation, lighting, reject handling and challenge criteria. Discuss an optical feasibility trial with Oxford Vision Systems. Use this guide to resolve false-accept, false-reject and challenge criteria before it limits the final system.
Discuss your application
What to record
False-Accept, False-Reject and Challenge Criteria: condition, range and effect on your process
Realistic range
Include good, bad and marginal examples, normal finish, batch, supplier and product variation, and credible extremes near the acceptance boundary. Reproduce the intended presentation, speed and environment.
Effect on the system
Record whether the correct part receives the agreed reject or line-control response. Separate false accepts from false rejects and retain uncertain or missing results, fault indication, recovery observations and open acceptance points.
Before you contact us
Five questions about false-accept, false-reject and challenge criteria for your application
- Who can confirm this information?Identify the person responsible for false-accept, false-reject and challenge criteria in production, quality, engineering or operations.
- How representative is the sample?Include age, supplier, batch, environment and upstream process state where they affect colour and variant verification.
- What is the difficult condition?Include the slow, reflective, flexible, dirty, damaged, marginal or uncommon case that your system must still handle.
- How will you judge the result?Agree the method, repetitions, acceptable range, result record and the response if the observed result falls outside the agreed range.
- What else must be coordinated?Your final colour and variant verification scope must also account for recipe, reject and line-control interfaces, false-accept, false-reject and challenge criteria, current regulations and the conditions at your site.
Connected details
Review false-accept, false-reject and challenge criteria as part of the complete system
Visible Defect or Measurement Definition for Colour & Variant Verification
Approve the colour or variant decision and acceptance boundary using identified acceptable, unacceptable and marginal references. Record who may approve references and recipe changes.
Good, Bad and Marginal Sample Range
Retain sample identities and approved classifications. Include normal finish, batch, supplier and product variation and credible extremes near the decision boundary.
Part Presentation and Production Speed
Record actual position and production-speed conditions for the trial. Check that the observed result stays associated with the correct product throughout the line sequence.
Optics, Lighting and Environmental Conditions
Trial the intended lighting, background, finish and environmental range. Record where acceptable production variation and the reject condition cannot be reliably distinguished.
Recipe, Reject and Line-Control Interfaces
Demonstrate the agreed response to incorrect, uncertain and missing results with the correct part and recipe. Include recipe changes, fault indication and controlled recovery.
False-Accept, False-Reject and Challenge Criteria
Agree method, repetitions, acceptance limits and records first. Retain expected and observed outcomes, false accepts and false rejects separately, unresolved cases and later change controls.