放大照片后，人脸出现了明显的像素化现象。

After zooming in, the face showed obvious ___pixelation.

为了保护受害者的隐私，警方在新闻发布会上对视频中的脸部进行了马赛克处理。

To protect the victim's privacy, the police used ___pixelation on the faces in the video during the press conference.