Accurate survey recognition depends on the corner marks printed on each page. These small markers help PaperSurvey align and interpret scanned content, so keeping them visible during printing and scanning is essential for reliable results.
For best results, all four corner marks should be visible on every scanned page. When full visibility is not possible, here are the key considerations:
Three Corner Marks: At a minimum, three corner marks should be visible. This can still produce accurate recognition.
Two Corner Marks: Pages can still be recognized if only two corner marks are visible and the page is not skewed. However, recognition accuracy may be slightly lower. By default, pages with just two corner marks will not be read and will be marked as not recognized.
QR Codes Are Damaged or Not Showing Up: There may be one or two QR codes at the bottom of each page, depending on your survey configuration. These codes must be readable because they are used to automatically identify and process pages.
Reattempting Recognition
You can reattempt recognition when only two corners are visible by performing a manual action. Please note that skewed pages may lead to recognition errors and reduced accuracy. Avoid using this option on pages that are improperly aligned.
To reattempt recognition, + expand the document in the uploads page, select the relevant pages you wish to retry, and press Re-attempt recognition -> Missing corner marks.
Issues with Printing Surveys
Some printers may omit the bottom part of the page, resulting in missing corner marks. To address this, you have a few options:
- Use a different printer that can properly print all four corner marks.
- For testing only: Scale down the PDF before printing to ensure that all corner marks are visible and recognized accurately. This can cause problems with recognition in certain cases, so it is only suitable for test scenarios.
If you encounter challenges with corner mark visibility, reach out to our support team for guidance and assistance.