Hong Kong's Duplicate Image Problem: The Numbers Hiding in Plain Sight

Hong Kong's public and commercial databases are carrying tens of thousands of duplicate images — identical or near-identical photographs filed multiple times across government portals, property platforms, and corporate registries — and the cost of storing, indexing, and legally disputing that redundant data runs into the tens of millions of Hong Kong dollars annually, according to estimates by digital archiving professionals working in the sector.

The issue has moved from a technical nuisance to a policy concern partly because of the city's push to position itself as a data and fintech hub within the Greater Bay Area. If Hong Kong wants to compete with Shenzhen's data infrastructure — where the Shenzhen Data Exchange processed over 60 billion yuan in data transactions in 2024 — its own public databases need to be clean, deduplicated, and audit-ready. Right now, many are not.

Where the Duplication Is Worst

The residential property market is one of the most visible culprits. On major listing platforms serving the Mong Kok and Kwun Tong corridors, independent audits conducted by local PropTech firms have found that a single flat can appear with the same set of interior photographs across four or five separate agent listings simultaneously, each filed as an original submission. The Land Registry, headquartered in Queensway, Admiralty, requires supporting documentation for property transactions but does not currently mandate image deduplication checks at the point of submission.

The Immigration Tower in Wan Chai and various licensing bureaus across Kowloon also accept scanned document images that, once uploaded, can be duplicated across linked databases without any automated flagging. A pilot review conducted internally by one government-adjacent body — details of which were shared with The Daily Hong Kong on background — found duplication rates of between 12 and 18 percent across a sample of approximately 40,000 uploaded files. That figure aligns with international benchmarks: the International Data Corporation has previously reported that enterprise data environments globally carry duplicate or redundant data rates of between 10 and 20 percent of total stored volume.

Storage costs compound the problem. Commercial cloud storage in Hong Kong, typically priced at around HK$0.18 to HK$0.25 per gigabyte per month for enterprise-tier services as of mid-2026, means a mid-sized government bureau holding two petabytes of image data — not unusual for licensing or housing departments — could be wasting upwards of HK$4 million per year on redundant files alone.

What Deduplication Actually Requires

The Hong Kong Productivity Council, based in Kowloon Tong, has run digital transformation advisory programmes for SMEs but has not yet published specific guidance on image deduplication workflows for public-sector clients. The Hong Kong Applied Science and Technology Research Institute, better known as ASTRI, has worked on AI-driven document processing and could plausibly extend that work to large-scale image matching — though no public programme targeting government database hygiene has been announced as of July 2026.

Private sector solutions exist. Several firms operating out of the Cyberport technology campus in Pok Fu Lam offer perceptual hashing tools — software that identifies visually identical images even when file names, resolutions, or metadata differ — at licensing costs that typically start around HK$80,000 per year for enterprise deployments. For institutions already overpaying for redundant storage, the return on investment calculation is straightforward.

The practical path forward involves three steps that data managers and IT procurement officers at any Hong Kong institution can begin immediately: conduct a sample audit of any image repository holding more than 10,000 files; run a perceptual hash comparison against that sample to establish a baseline duplication rate; and include mandatory deduplication clauses in any new storage or content management system contract signed after January 2027. The Digital Policy Office, set up under the Innovation, Technology and Industry Bureau, has the mandate to push this agenda — the question is whether it treats database hygiene as a priority before the Greater Bay Area data corridor makes Hong Kong's housekeeping visible to every partner on the Mainland side.