How researchers combined AI and manual counting techniques to estimate the size of the crowd at Hong Kong's annual pro-democracy protest on July 1 (New York Times)

New York Times:
How researchers combined AI and manual counting techniques to estimate the size of the crowd at Hong Kong's annual pro-democracy protest on July 1  —  Crowd estimates for Hong Kong's large pro-democracy protests have been a point of contention for years.  The organizers and the police often release vastly divergent estimates.