We
tested the Dahua 8242 face recognition camerashown on that webpage and it had various problems.
From our summary:
The Dahua DH-IPC-HF8242FN-FR had multiple issues making it more difficult to recommend for larger/more widespread use.
- Low recognition rate: The camera failed to recognize ~30%+ of subjects whose faces were detected, due to multiple issues, with angle of incidence, subjects looking down/away, and low light causing the majority of failures.
- Significant confidence reductions when looking down/away: In our tests, camera confidence decreased by at least ~8-10% when subjects looked down or away from the camera, making it the biggest issue in reliable capture.
- Significant WDR/low light confidence reductions: Additionally, confidence dropped at least 4-5% under more difficult lighting conditions, including simple WDR scenes, 2-5 lux low light, or dark scenes with IR on.
- Reduced or no recognition under 1 lux (without IR): Below 1 lux, recognition became spotty, with the majority of subjects missed. At ~0.5 lux and below, detection did not work at all.
- Multiple instances of mistaken recognition: The camera mistook one person for another 4 times over two weeks of testing in multiple scenarios, using a total database of about 30 people in a small office. In higher volume installations, accuracy is likely to decrease, as additional subjects increase the likelihood that two people will look alike.
- Frequent incorrect demographic information: Demographic information of subjects was frequently wrong, with male/female, glasses/no glasses, beard/no beard, and other factors incorrect much of the time.