It was kicked off last June by President Nicolas Sarkozy, who announced in a major speech that the face veil, which he called a burqa, was against French values and not welcome in France.

VOA: standard.2010.01.30

You've got a picture of somebody's face, it's a million pixels. Each pixel has a range of values from zero to 256. I want to hash a face with some function into an integer.

你有一个人的脸部照片，它有一百万个像素,每个像素的值范围在0到256之间,我想用某个函数将一张脸部照片。

麻省理工公开课 - 计算机科学及编程导论课程节选