Resolution of Saturated Color Television Picture

Color MTF of Vision and Improvement of NTSC Signal

Abstract

The modulation transfer function (MTF) of blue receptor in the retina was found to have a nonrower bandwidth compared with red and green receptors. However, blue light of a color CRT excites not only blue cones but also red and green cones because blue light has a wide spectrum range.
Thus the MTF characteristics of vision for each three primary colors on a CRT become equal. Even a blue, therefore, the resolution in high saturated color pictures on the NTSC television system becomes worse.
This paper presents a new method that high frequency components of a color difference signal are added to a luminance signal in order to correct the resolution. It was applied to the NTSC color TV system and its effectiveness was confirmed.