[1] A. B. et al., "Facial expression analysis in candid videos," in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2018, pp. 1234-1243.

The "HD" in the name was a lie and a truth. The resolution was high—4K, sometimes 8K—but the candid part was the cruelty. Because no one in those frames knew they were being seen. They picked their noses. They sobbed into pillows. They practiced conversations in the mirror, mouths moving silently as they rehearsed what they should have said to their bosses, their exes, their dead parents. They sat on toilet seats, scrolling through messages, faces slack and unguarded in ways no human being ever allows a camera to see.

Three weeks later, a reply: The resident passed away on [date]. Cause of death: natural. Thank you for your concern.

"They're acting like people who are being told what to do."

"You went deep," he said.

The concept of candid cameras has been around for decades, with early models using standard definition video to capture unedited moments. However, it wasn't until the advent of high-definition technology that Candid-HD cameras became a reality. In the early 2000s, camera manufacturers began to develop HD-capable cameras that were designed to capture candid moments. These early models were expensive and often bulky, but they paved the way for the development of more advanced Candid-HD cameras.