Tiley said that there were “strict protocols about what could be shown, but that players were not all explicitly warned about the cameras or told to sign waivers agreeing to be shown at any time. The high-definition cameras are in areas otherwise off-limits to the public and, this year for the first time, to accredited news media.

“The cameras are round and black and hang down from the ceiling,” Tiley said. “They are very easy to see, and we have had dozens and dozens of players and coaches playing up to them.”

There are areas the cameras do not show, including the players’ restaurant and gym.

“They’re not in the locker room, not that I know of,” Maria Sharapova said, smiling. “Safe there.”

But many players and coaches did not realize the scope of the surveillance. Serena Williams, who starred in her own HBO reality show, “Being Serena,” and even gave birth on camera, said she initially did not notice how many cameras were tracking her at the tournament until she heard other players talking about them and began to look around.

“Then I was, like, ‘Oh, there is a camera there; oh, there is one there,’ ” Williams said. “They are everywhere, which I actually didn’t realize. Good to know.”

Naomi Osaka also underestimated the number of cameras watching her, thinking there was only one. “I guess I will be very conscious,” she said.