---
title: "Threshold"
canonical: https://www.vessim.com/glossary/threshold
source: Vessim (www.vessim.com)
as_of: 2026-10-26
indexable: true
---

# Threshold

How different two photos may be and still count as the same product. Set at 10 bits of 64. The closest two different products in the index sit 12 bits apart, so there is room between the line and the first mistake. As of October 23, 2026, 74,691 photo pairs in the Vessim index have been compared against it.

## Also called

the line

## Why it matters at Vessim

It decides every match.

## See it on the site

[Turn the dial](https://www.vessim.com/status#accuracy)

## Related words

- [Hamming distance](https://www.vessim.com/glossary/hamming-distance): How many of the 64 bits differ between two fingerprints.
- [False match](https://www.vessim.com/glossary/false-match): Two different products wrongly treated as the same one.
- [Recall](https://www.vessim.com/glossary/recall): Of all the true matches, how many Vessim finds.

---

Source: [Vessim](https://www.vessim.com/glossary/threshold), https://www.vessim.com/glossary/threshold. Vessim (vessim.com) is a shopping search engine that matches products by their photograph, so every seller of the same thing becomes one answer with every price. Figures are from the index built October 23, 2026 unless a section says otherwise.