Instruction Manual Presence/Absence Inspection
Judges whether instruction manuals are placed in the packaging with the product, and can also verify page count, version or matching of multilingual manuals.
inspection Overview
Instruction manual presence/absence inspection: determines whether the instruction manual is placed in the packaging with the product, and can also verify page count, version, or whether the matching multilingual manual is included. The judgement usually does not check details such as threads or dimensions, but rather Whether the visual feature at that position exists and matches expectations, output OK / NG and interlock with the production line.
Judge whether the instruction manual is packed with the product, and also verify whether the page count, version or multilingual manuals are complete.
The feasibility of "instruction manual presence/absence inspection" depends on Whether the visual features of the object are stable and distinguishable, as well as the on-site optical and tooling conditions. Each item is expanded below in the order commonly used in inspection engineering.
Object Characteristics
How the object appears in the image
- Paper part, mostly white or light in color
- May be obscured by other items inside the packaging
- Many versions and languages with similar appearance
- Items may appear stacked, so the number of sheets must be determined
inspection Challenges
Where Problems Really Occur on Site
- White instruction manuals have low contrast against white packaging or foam
- Lighting conditions inside packaging are poor, often requiring see-through or open-lid inspection
- Counting sheets requires edge segmentation; boundaries are not obvious when stacked
- Multilingual instruction manuals look similar
Vision Judgement method
How acceptance criteria are set and why
The most direct acceptance criterion is Whether a rectangular paper area exists inside the packaging; if the version must be judged, the text or pattern on the cover has to be recognized.
Sheet count verification requires resolving the edge of each sheet, which places higher demands on imaging sharpness; validation before implementation is recommended.
Applicable algorithm
Choose by the Form of the Acceptance Criteria, Not by Complexity
Region presence
Determine whether the instruction manual itself is present in the packaging
OCR / Classification
Recognize the version, language, or text marking
Optical Precautions
Imaging conditions set the upper limit of feasibility
- In-pack inspection usually needs dedicated fill lighting to avoid shadow obstruction
- A white instruction manual can be located by slight color difference or edge shadow
- If cover text must be read, sufficient resolution and glare-free illumination are required
OK / NG Output
How results are judged and passed to the production line
| Inspection Status | judgement | Interlocking Action |
|---|---|---|
| Instruction manual detected | OK | release |
| No instruction manual detected | NG | Block as a missed item |
| Wrong version / language (optional) | NG | Treat as wrong part |
Applicable Industry
This type of inspection is common in the following industries
Common Question
The most common questions about this object
Can the instruction manual inside the packaging box be inspected?
Yes, but it is limited by the lighting conditions inside the box; dedicated fill lighting or inspection with the lid open is usually required. If the box is opaque and cannot be opened, inspection points can only be placed before and after packing.
Can instruction manual pages be counted?
Yes, but it is clearly harder than presence/absence judgement, because the edge of each sheet must be distinguished clearly. We recommend providing actual samples first to verify whether they can be told apart when thinnest and most tightly stacked.
What are the acceptance criteria for this object?
The most direct acceptance criterion is whether a rectangular paper area exists inside the packaging; if the version must be judged, the text or pattern on the cover has to be recognized.
What are the illumination requirements for this type of object?
In-package inspection usually requires dedicated fill lighting to avoid shadow obstruction. A white instruction manual can be located by a slight color difference or its edge shadow
What Are the Inspection Accuracy and Minimum Detectable Size?
It depends on the combination of field of view and camera resolution, and is affected by the lens, illumination and algorithm. To be added — the configuration must be derived from your minimum defect size, subject to the results of a measured sample trial.
How Do We Verify That Our Product Can Be Detected?
Please provide samples of the packed product (including one with the instruction manual missing) and the list of instruction manual versions.
Submit sample testing
Please provide samples of the packed product (including one with the instruction manual missing) and the list of instruction manual versions.
Submitted successfully
We have received your sample testing request. A solution engineer will contact you within 1 business day via contact you.
Need to assess imaging conditions, defect criteria and cycle time item by item? Go to the Full Requirement Assessment →
Send Us Your Workpiece and We Will Show You the Measured Results
Provide several OK and NG samples, and the solution engineer will run actual imaging and judgement tests on the equipment, then give inspection configuration recommendations that can be implemented, rather than just reading a specification table.