影像科学与光化学 ›› 1983, Vol. 1 ›› Issue (3): 1-5.DOI: 10.7517/j.issn.1674-0475.1983.03.1

• 研究论文 •    下一篇

感光胶片调制传递函数测定方法的一些改进

贺光潜, 张靖娴, 刘桂英   

  1. 中国科学院感光化学研究所
  • 收稿日期:1982-02-01 出版日期:1983-08-20 发布日期:1983-08-20

SOME IMPROVEMENTS IN MEASUREMENT OF MODULATION TRANSFER FUNCTION OF PHOTOGRAPHIC FILMS

HE GUANG-QIAN, ZHANG JING-XIAN, Liu GUI-TING   

  1. Institute of Photographic Chemistry, Academia Sinica
  • Received:1982-02-01 Online:1983-08-20 Published:1983-08-20

摘要: 用正弦波模板法测定感光胶片的调制传递函数(MTF)时,主要的误差有以下几种:第一是颗粒噪声的影响,第二是手工数据处理产生的误差,第三是扫描时试样上的线条可能和狭缝不完全平行所造成的一定的测量误差.为了尽量减小上述误差,实验中我们使用了一台小型电子计算机.在计算机程序中用了“同相位叠加”技术,扫描时用了一种特殊的“调平行”方法.测定是完全自动的,测定结果的重复性较好,速度也较快.

Abstract: In the determination of the MTP of photographic films by using a sinusoidal test object, errors may spring from granularity, data processing and sample alignment.In the present paper, measures such as accumulation in phase technique, computerized process control and a special technique of sample alignment are taken to minimize the experimental errors.The results are well reproducible and the time needed for scanning the whole test pattern is less than 3 minutes.