Hong Kong's Duplicate Image Problem: How the City Stacks Up Against Singapore and London

Hong Kong's public and commercial image libraries are sitting on a growing backlog of duplicated digital assets, and the gap between how this city manages the problem versus its closest rivals is becoming harder to ignore. The issue cuts across newsrooms, government portals, property listings, and the cultural heritage sector, where redundant files are eating storage budgets and degrading search accuracy across platforms maintained by organisations from Wan Chai to Tuen Mun.

The timing matters. Hong Kong's push to position itself as a data-economy hub within the Greater Bay Area has put pressure on institutions to modernise their digital infrastructure. Duplicate imagery — files that are identical or near-identical, often ingested multiple times through syndication feeds or manual re-uploads — is a mundane but genuinely costly drag on that ambition. The Hong Kong Public Libraries system, operated by the Leisure and Cultural Services Department, and the Hong Kong Stock Exchange's listed-company disclosure portal are among the public-facing platforms where the problem surfaces most visibly in day-to-day use.

What Hong Kong Is Actually Doing

The Hong Kong Science and Technology Parks Corporation, based in Pak Shek Kok, has piloted perceptual-hashing tools — software that generates a fingerprint for each image and flags near-duplicates regardless of minor resizing or compression differences — as part of a broader digital-asset management overhaul that began in early 2025. The approach mirrors what Singapore's National Library Board rolled out across its digital collections in 2023, when the NLB integrated automated deduplication into its OverDrive-linked multimedia catalogue. Hong Kong's effort is narrower in scope so far, limited to assets managed directly by the Science Park's tenant-support infrastructure rather than any government-wide mandate.

Commercial real estate is where the duplication burden is most acute locally. Property listing platforms serving the residential market in Kowloon and the New Territories regularly carry the same flat photographs uploaded by multiple agencies or re-listed after tenancy changes, inflating apparent inventory and frustrating buyers. One structural constraint: Hong Kong has no equivalent to the UK's Property Mark accreditation framework, which since 2024 has encouraged member agencies in cities including London and Manchester to adopt shared image-deduplication standards through the major portal operators.

In London, Rightmove and Zoopla both implemented backend hash-matching in 2024 to suppress duplicate listings, a move credited with reducing redundant image records across their combined databases by a reported margin described in trade press coverage at the time. Hong Kong's two dominant portals, Centaline Property's online platform and Midland Realty's listings site, have not made equivalent public commitments as of July 2026.

The Data Gap and What Comes Next

Quantifying the scale precisely is difficult because no Hong Kong government body publishes a unified audit of digital-asset duplication rates across public platforms. For context on the broader problem, research published in 2024 by the International Press Telecommunications Council found that news agency image databases globally carried duplication rates of between 12 and 22 percent before automated cleaning, depending on archive age. The HKPL digital collection, which crossed 2 million catalogued items in 2023 according to LCSD annual figures, has not disclosed a comparable internal metric.

Singapore's approach offers a useful benchmark. The Infocomm Media Development Authority there embedded deduplication requirements into its 2024 Digital Infrastructure Act obligations for large-platform operators, giving it regulatory teeth that Hong Kong's equivalent framework, administered through the Office of the Communications Authority in Wan Chai, currently lacks.

Institutions in Hong Kong looking to get ahead of the problem now have practical options. Open-source tools including PhotoDNA and pHash are deployable without significant capital outlay and are already in use by several Cyberport-based startups working on content-moderation products. For organisations waiting on a government-wide standard, the more realistic near-term trigger is likely to be Greater Bay Area data-interoperability rules, which Mainland regulators are expected to refine through 2026 and which will implicitly require cleaner, deduplicated asset registries on the Hong Kong side of cross-boundary data flows.

Until a mandate arrives, the gap between Hong Kong and Singapore on this specific, unglamorous corner of digital hygiene will keep widening — one redundant file at a time.