Siemens star

短语

词形变化

Siemens stars 复数

释义与例句

n.
  1. 1.

    A radial, sunburst-like test target used to measure the resolution and image quality of optical instruments, cameras, scanners, and printers.

词源

Developed in the 1930s by Siemens & Halske AG to test the lenses of their narrow-film cameras.

来源：wiktionary