The government of Sao Paulo goes against the grain and claims that there were more than 750 thousand demonstrators on Avenida Paulista
Summary
It is estimated that 185 thousand people participated in the demonstration called by former president Jair Bolsonaro on Avenida Paulista. São Paulo’s Public Security Secretariat estimates that 600,000 people were present at the scene and 750,000 in total, including those who were nearby.
The demonstration called by former president Jair Bolsonaro (PL) this Sunday (25) in Avenida Paulista brought together 185,000 people, according to an estimate by the Monitor of Political Debate in the Digital Environment, a research project of the University of São Paulo (USP).
The number of protesters was estimated at around 3pm (Brasilia time), which, according to the survey, was the time of greatest concentration in the São Paulo region.
On the other hand, the Public Security Secretariat of São Paulo (SSP) states that 600,000 people were present on site. It should also be noted that in total 750,000 people were present, also counting the people who were nearby, without necessarily attending the demonstration.
USP researchers make the projection based on aerial imagery, he said. In these studies, the final number is calculated based on the maximum concentration of protesters, as explained by one of the project coordinators, Pablo Ortellado.
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In total, between 15 and 17 43 photos were taken from above, of which 11 were prepared and without overlaps: “Each of the photos was divided into eight pieces. An implementation of the Point to Point Network (P2PNet)1 method, which identifies heads and estimates the number of people in an image, was applied in each part,” the researchers explain.
The method has a precision of 72.9% and an accuracy of 69.5% in identifying each person. The average percentage error is plus or minus 12% for aerial images with more than 500 people.
Source: Terra
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