先拍照后对焦的摄影技术

Take Shots First and Focus Later

美国Lytro公司开发了一种新的相机，将于今年晚些时候上市，它应用了一种新的技术，允许在照片拍摄完成之后再进行聚焦调整。这种照相机不仅仅是捕捉一个光面，而是捕捉一张照片周围整个光场（1ightfield），只用一台设备，拍摄一次。光场包括了照片周围所有方向的光线。相关研究始于20世纪90年代的斯坦福大学，当时人们在一间屋子里用了100台照相机。

With an innovative camera due out later this year from a company called Lytro,photographers will have one less excuse for having missed that perfect shot.The company's technology allows a picture's focus to be adjusted after it is taken,