The focal spot sizes can immediately influence picturedefinition when X-ray machine carry through clairvoyance and photography.
焦点的尺寸大小及聚焦质量直接影响X射线机透视、摄影图像的清晰度；
2
This paper points out that the TV line frequency has significant action on spectrum and certain influence upon picturedefinition.
本文指出行频对电视频谱特性起重要作用，对图象清晰度有一定的影响。
3
The present invention has following advantages of improving picturedefinition and brightness of a color picture tube, simplifying manufacturing technique and reducing production cost.