为什么要在分享前模糊人脸
人脸识别系统能凭一张分享出去的照片识别出某个人——即便在人群中或处于一定角度——而 Clearview AI 这样的服务已抓取了数十亿张图像，用以在全网范围内匹配人脸。抗议活动的照片曾被用来识别参与者，孩子的照片也曾从公开帖子中被收割。在分享前模糊人脸，正逐渐成为一种基本的、尊重隐私的默认做法。（关于人脸识别如何运作以及完整的风险图景，详见人脸隐私的 Learn 文章。）
四步模糊人脸
- 1Upload your photo to PrivaFace. The AI face detection model behind it runs entirely within your local browser, automatically detecting every face that appears in the image — and that includes faces that are only partially visible as well as faces seen at an angle that are not directly facing the camera, making the detection remarkably thorough.
- 2Next, review the faces the tool has detected, one by one. The tool highlights each detected face by marking it with a clear bounding box. You are free to toggle the blur on or off for each individual face, flexibly adjust the intensity of the blur, and even manually add blur regions for any faces the AI may have inadvertently missed, leaving nothing to chance.
- 3导出之前，放大并确认每一张脸都被完全遮盖——包括背景中的小脸和检测器漏掉的任何一张。一张只露出部分的脸仍可能被匹配，所以请在 AI 漏掉的地方手动添加模糊区域，并对任何模棱两可之处加大模糊强度。
- 4把匿名化后的图像下载为高质量的 PNG 或 WebP。结果在你的浏览器中本地生成，并直接保存到你的设备——原图和处理后的图像都不会离开标签页，关闭标签页就会自动清除所有数据。
人脸隐私最佳实践
When photographing various live events, first think carefully about whether you need to obtain consent in advance, before deciding whether or not to share the photos. Laws around street photography actually differ enormously from one country and region to the next — what is legally permissible to photograph is not always appropriate or suitable to share publicly. For group photos, blur out the faces of anyone who has not explicitly agreed to appear, and be especially cautious and considerate when it comes to the faces of children. For extremely demanding privacy needs, face blurring alone is not actually foolproof — because other identifying features (such as a distinctive tattoo, an unusual body shape, conspicuous clothing, or a recognizable background) may still betray the subject's identity. So in any high-stakes anonymization scenario, be sure to consider more thorough and comprehensive approaches. In addition, when sharing screenshots of video calls or online meetings, always be sure to fully blur out the faces of any participants who have not agreed to have that screenshot shared externally, as a sign of respect.